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Ji SH, Kim TK, Keum YS, Chun SC. The Major Postharvest Disease of Onion and Its Control with Thymol Fumigation During Low-Temperature Storage. Mycobiology 2018; 46:242-253. [PMID: 30294484 PMCID: PMC6171440 DOI: 10.1080/12298093.2018.1505245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 04/05/2018] [Accepted: 05/14/2018] [Indexed: 05/13/2023]
Abstract
Onion (Allium cepa L.) is one of the major vegetable crops in Korea that are damaged and lost by pathogenic fungal infection during storage due to a lack of proper storage conditions. The aim of this study was to determine an appropriate control measure using thymol to increase the shelf life of onions. To control fungal infections that occur during low-temperature storage, it is necessary to identify the predominant fungal pathogens that appear in low-temperature storage houses. Botrytis aclada was found to be the most predominant fungal pathogen during low-temperature storage. The antifungal activity of the plant essential oil thymol was tested and compared to that of the existing sulfur treatments. B. aclada growth was significantly inhibited up to 16 weeks with spray treatments using a thymol solution. To identify an appropriate method for treating onions in a low-temperature storage house, thymol was delivered by two fumigation treatment methods, either by heating it in the granule form or as a solution at low-temperature storage conditions (in vivo). We confirmed that the disease severity was reduced up to 96% by fumigating thymol solution compared to the untreated control. The efficacy of the fumigation of thymol solution was validated by testing onions in a low-temperature storage house in Muan, Jeollanam-do. Based on these results, the present study suggests that fumigation of the thymol solution as a natural preservative and fungicide can be used as an eco-friendly substitute for existing methods to control postharvest disease in long-term storage crops on a commercial scale.
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Affiliation(s)
- Sang Hye Ji
- Department of Bioresources and Food Science, Konkuk University, Seoul, Republic of Korea
| | - Tae Kwang Kim
- Department of Bioresources and Food Science, Konkuk University, Seoul, Republic of Korea
| | - Young Soo Keum
- Department of Crop Science, Konkuk University, Seoul, Republic of Korea
| | - Se-Chul Chun
- Department of Bioresources and Food Science, Konkuk University, Seoul, Republic of Korea
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Ko EY, Nile SH, Jung YS, Keum YS. Antioxidant and antiplatelet potential of different methanol fractions and flavonols extracted from onion ( Allium cepa L.). 3 Biotech 2018; 8:155. [PMID: 29511606 PMCID: PMC5832655 DOI: 10.1007/s13205-018-1184-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2017] [Accepted: 02/23/2018] [Indexed: 11/25/2022] Open
Abstract
In this study, we reported the potential of various methanol fractions of onion (MFO) and its components quercetin and quercetin glucosides on platelet aggregation and antioxidant activity. The onion extracts were separated into several fractions using methanol and water. Further, these extracts were analyzed using simple high-performance liquid chromatography-diode array detector method to separate quercetin (Q), quercetin-4'-O-monoglucoside and quercetin-3, 4'-O-diglucoside from onion sample. It was observed that the bioactive compounds were accumulated in the non-polar portions rather than in the polar one. MFO and flavonol glucosides inhibited collagen-induced platelet aggregation, and the anti-aggregatory effects were comparatively studied using rat PRP (platelet-rich plasma). Among the extracted compounds, quercetin was found as a potent inhibitor of platelet aggregation compared to quercetin glucosides, whereas quercetin glucosides showed high antioxidant activities. These results suggest that MFO, quercetin and quercetin glucosides have powerful antiplatelet and antioxidant activities. These studies provide possible information leading to the intake of onions rich in these flavonols as a dietary supplement and functional food ingredient to prevent thrombosis and cardiovascular and oxidative stress-related diseases and might be utilized as a real source of valuable phytochemicals for the pharmaceutical and food industries for the development of antioxidant, anticoagulant and antiplatelet agents.
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Affiliation(s)
- Eun Young Ko
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul, 05029 Republic of Korea
| | - Shivraj Hariram Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029 Republic of Korea
| | - Yi-Sook Jung
- College of Pharmacy, Ajou University, Suwon, 443749 Republic of Korea
| | - Young Soo Keum
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029 Republic of Korea
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Nile A, Nile SH, Kim DH, Keum YS, Seok PG, Sharma K. Valorization of onion solid waste and their flavonols for assessment of cytotoxicity, enzyme inhibitory and antioxidant activities. Food Chem Toxicol 2018; 119:281-289. [PMID: 29496529 DOI: 10.1016/j.fct.2018.02.056] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 02/02/2018] [Accepted: 02/24/2018] [Indexed: 10/17/2022]
Abstract
Onion (Allium cepa L.) is rich with flavonols which perceived benefits to human health. Flavonols like quercetin and quercetin glycosides from onion solid waste (OSW) have been extracted and tested against enzymes of clinical importance in Alzheimer's disease and diabetes and be shown to have cytotoxic and antioxidant effects. A simple high-performance liquid chromatography-diode array detector method using a Zorbax Eclipse XDB C18 column was developed to separate quercetin-3, 4'-O-diglucoside, quercetin-4'-O-monoglucoside, and quercetin from OSW. These compounds were identified using infrared, ultra-violet, 1H, and 13C nuclear magnetic resonance spectroscopic techniques. The OSW solvent fractions and flavonols showed significant antioxidant activities using DPPH (1, 1-diphenyl-2-picrylhydrazyl), FRAP (ferric reducing antioxidant power), and ABTS (2,2'-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid) radical scavenging assays. The samples exhibited significant in vitro anti-cholinesterase activity with strong antidiabetic effects. OSW extracted with methanol and ethanol showed greater in vitro anti-cholinesterase and hypoglycemic effects than QDG, QMG, and Q possibly due to interactions between multiple compounds and/or complex multivariate interactions with other factors in OSW. In addition, cytotoxicity assays showed that OSW and QDG, QMG, and Q could inhibit the proliferation of selected cancer cell lines. Results indicate that OSW and flavonol glycosides are potential antioxidant, antidiabetic, anticancer, and sedative agents.
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Affiliation(s)
- Arti Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 05029, Republic of Korea
| | - Shivraj Hariram Nile
- Institute of Natural Science and Agriculture, Konkuk University, Seoul 05029, Republic of Korea; Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 05029, Republic of Korea.
| | - Doo Hwan Kim
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 05029, Republic of Korea
| | - Young Soo Keum
- Department of Crop Science, Sanghuh College of Life Sciences, Konkuk University, Seoul 05029, Republic of Korea
| | - Park Gyun Seok
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 05029, Republic of Korea
| | - Kavita Sharma
- Department of Chemistry, Idaho State University, Pocatello, ID 83209, USA
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Nile AS, Nile SH, Keum YS, Kim DH, Venkidasamy B, Ramalingam S. Nematicidal potential and specific enzyme activity enhancement potential of neem (Azadirachta indica A. Juss.) aerial parts. Environ Sci Pollut Res Int 2018; 25:4204-4213. [PMID: 29177786 DOI: 10.1007/s11356-017-0821-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 11/21/2017] [Indexed: 06/07/2023]
Abstract
Nematodes are considered as major plant parasites damaging most of the crops, and neem plant exhibits potential nematicidal and insecticidal properties. This study aimed to check nemato-toxic potential of neem (Azadirachta indica) plant using in vitro and in-planta trials against Meloidogyne incognita. The findings suggested that the neem extracts were lethal to second-stage juvenile (J2) and egg hatching with simultaneous enhancement in treated tomato plant growth. The egg numbers of M. incognita found less sensitive to the aqueous and alcoholic extracts than those of J2 as per LC50 values. Complete mortality of J2s was recorded at 40, 60, and 80% of neem standard extract (SE) dilutions and for undiluted SE of neem. The undiluted SE extract showed 100% inhibition of egg production. The highest reductions in the number of galls/root system, J2 population, and egg production were observed with 80, 85, and 82% SE as compared control (untreated distilled water). The maximum 250% growth increment was observed in the length of tomato roots supplemented with neem extracts. Resistance-related enzyme [phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO), and peroxidase (POX)] activities in tomato plant have been increased significantly by supplementation with neem extracts. It appears that the aerial parts of neem (A. indica) extracts showed significant and sustainable eco-friendly nemato-toxic potential towards M. incognita growth inhibition and eradication using alcoholic extracts compared to aqueous. From this study, it was concluded that the neem aerial parts were useful for the control of M. incognita and could be a possible replacement for synthetic nematicides in crop protection with utilization in enhancement of specific enzyme activity in tomato plants.
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Affiliation(s)
- Arti Shivraj Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 143701, South Korea
| | - Shivraj Hariram Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 143701, South Korea.
- Department of Crop Science, Sanghuh College of Life Sciences, Konkuk University, Seoul, 05029, Republic of Korea.
| | - Young Soo Keum
- Department of Crop Science, Sanghuh College of Life Sciences, Konkuk University, Seoul, 05029, Republic of Korea
| | - Doo Hwan Kim
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 143701, South Korea
| | - Baskar Venkidasamy
- Plant Genetic Engineering Laboratory, Department of Biotechnology, Bharathiyar University, Coimbatore, Tamil Nadu, 641046, India
| | - Sathishkumar Ramalingam
- Plant Genetic Engineering Laboratory, Department of Biotechnology, Bharathiyar University, Coimbatore, Tamil Nadu, 641046, India
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Nile SH, Nile AS, Keum YS, Sharma K. Utilization of quercetin and quercetin glycosides from onion ( Allium cepa L.) solid waste as an antioxidant, urease and xanthine oxidase inhibitors. Food Chem 2017; 235:119-126. [DOI: 10.1016/j.foodchem.2017.05.043] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 05/05/2017] [Accepted: 05/08/2017] [Indexed: 10/19/2022]
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Nile SH, Keum YS, Nile AS, Kwon YD, Kim DH. Potential cow milk xanthine oxidase inhibitory and antioxidant activity of selected phenolic acid derivatives. J Biochem Mol Toxicol 2017; 32. [DOI: 10.1002/jbt.22005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 09/21/2017] [Accepted: 09/26/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Shivraj Hariram Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 05029 Republic of Korea
- Department of Crop Science, Sanghuh College of Life Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Young Soo Keum
- Department of Crop Science, Sanghuh College of Life Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Arti Shivraj Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Young Deuk Kwon
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Doo Hwan Kim
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 05029 Republic of Korea
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Nile SH, Keum YS, Nile AS, Jalde SS, Patel RV. Antioxidant, anti-inflammatory, and enzyme inhibitory activity of natural plant flavonoids and their synthesized derivatives. J Biochem Mol Toxicol 2017; 32. [DOI: 10.1002/jbt.22002] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 09/16/2017] [Accepted: 09/19/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Shivraj Hariram Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 143701 Republic of Korea
- Department of Crop Science, Sanghuh College of Life Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Young Soo Keum
- Department of Crop Science, Sanghuh College of Life Sciences; Konkuk University; Seoul 05029 Republic of Korea
| | - Arti Shivraj Nile
- Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; Seoul 143701 Republic of Korea
| | | | - Rahul V. Patel
- Department of Food Science and Biotechnology; Dongguk University; Ilsandong-gu Goyang-si Gyeonggi-do 410-820 Republic of Korea
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Shang X, Enkhtaivan G, Chun S, Gopal J, Keum YS. Transubstantiating commercial mushroom market with ultrasonically ultrasized mushroom powders showcasing higher bioactivity. Int J Biol Macromol 2016; 92:1082-1094. [DOI: 10.1016/j.ijbiomac.2016.07.103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 07/26/2016] [Accepted: 07/29/2016] [Indexed: 01/03/2023]
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Assefa AD, Keum YS. Effect of extraction solvent and various drying methods on polyphenol content and antioxidant activities of yuzu (Citrus junos Sieb ex Tanaka). Food Measure 2016. [DOI: 10.1007/s11694-016-9425-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Assefa AD, Saini RK, Keum YS. Extraction of antioxidants and flavonoids from yuzu (Citrus junos Sieb ex Tanaka) peels: a response surface methodology study. Food Measure 2016. [DOI: 10.1007/s11694-016-9405-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kim CS, Lee SK, Keum YS. Comparative studies of immobilized lipase- and acid-catalyzed fatty acid methyl ester synthesis for seed lipid analysis. Food Sci Biotechnol 2016; 25:771-776. [PMID: 30263335 DOI: 10.1007/s10068-016-0131-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 12/30/2015] [Accepted: 03/27/2016] [Indexed: 11/28/2022] Open
Abstract
Fatty acids are one of the most important nutrients in food. Acid- or base-catalyzed transesterification methods are commonly used for the analysis of fatty acids. However, several drawbacks were reported for these methods, including the isomerization and degradation of fatty acids. Lipase-catalyzed reactions are usually undertaken at mild conditions, preventing such problems. In this study, commercial resin-bound lipase from Candida antartica was tested for possible application in fatty acid methyl ester analysis. Experimental parameters, including temperature, reaction time, and re-cycling were evaluated. The optimized condition was (5-10 mg lipid, 0.5 mL of MeOH, and 50 mg Novozyme 435 in 2 mL toluene, 80°C for 1 h). In optimized condition, the lipase-catalyzed methods yielded similar results with the chemical method. In overall, lipase-catalyzed transesterification can be a useful alternative to acid-catalyzed methods for fatty acid analysis.
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Affiliation(s)
- Chang-Soo Kim
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029 Korea
| | - Si-Kyung Lee
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029 Korea
| | - Young Soo Keum
- Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029 Korea
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Mistry B, Patel RV, Keum YS, Noorzai R, Gansukh E, Kim DH. Synthesis of Mannich base derivatives of berberine and evaluation of their anticancer and antioxidant effects. Journal of Chemical Research 2016. [DOI: 10.3184/174751916x14525986827769] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The 9-demethylated derivative of the isoquinoline alkaloid berberine was derivatised in its isoquinoline moiety using enamines derived from formaldehyde and morpholine, piperidine, carbazole and six variously substituted piperazines to form Mannich base products which were evaluated for their in vitro biological effects. Standard tests determined their radical scavenging potential and their ferric reducing antioxidant power (FRAP). Cancerous growth inhibitory efficacies were assessed using cervical cancer cell lines HeLa and CaSki and their cytotoxicities towards normal cell lines were evaluated using Madin–Darby canine kidney (MDCK) cell lines. Piperazine derivatives bearing a heterocyclic nitrogen substituent such as a pyridyl or a pyrimidyl ring were the most active antioxidant and anticancer agents. A carbazole moiety attached to the berberine core also demonstrated excellent inhibitory effects on cancerous cells.
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Affiliation(s)
- Bhupendra Mistry
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
| | - Rahul V. Patel
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
| | - Young Soo Keum
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
| | - Rafi Noorzai
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
| | - Enkhtaivan Gansukh
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
| | - Doo Hwan Kim
- Organic Research Laboratory, Department of Bioresources and Food Sciences, College of Life and Environmental Sciences, Konkuk University, Seoul, South Korea
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Shang X, Muthu M, Keum YS, Chun S, Gopal J. An agile, simplified and sonication mediated one-pot aqueous extraction and antibacterial assessment of predominant Korean mushrooms. RSC Adv 2016. [DOI: 10.1039/c5ra25514g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Rapid sonication based aqueous extraction of antimicrobials from mushrooms.
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Affiliation(s)
- Xiaomin Shang
- Department of Bioresource and Food Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Manikandan Muthu
- Department of Bioresource and Food Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Young Soo Keum
- Department of Bioresource and Food Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Sechul Chun
- Department of Bioresource and Food Science
- Konkuk University
- Seoul 143-701
- Korea
| | - Judy Gopal
- Department of Bioresource and Food Science
- Konkuk University
- Seoul 143-701
- Korea
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Affiliation(s)
- Chang-Su Kim
- ; Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; 1 Hwayang-dong, Gwangjin-gu Seoul Republic of Korea
| | - Do-Hyung Lim
- ; Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; 1 Hwayang-dong, Gwangjin-gu Seoul Republic of Korea
| | - Young Soo Keum
- ; Department of Bioresources and Food Science, College of Life and Environmental Sciences; Konkuk University; 1 Hwayang-dong, Gwangjin-gu Seoul Republic of Korea
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Hur SJ, Kim DH, Chun SC, Lee SK, Keum YS. Effects of biopolymer encapsulation on trans fatty acid digestibility in an in vitro human digestion system. Food Funct 2013; 4:1827-34. [DOI: 10.1039/c3fo60327j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Affiliation(s)
- Mi Jang
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
| | - Leonid Asnin
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
| | - Shivraj Hariram Nile
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
| | - Young Soo Keum
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
| | - Hwang Yeon Kim
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
| | - Se Won Park
- Department of Molecular Biotechnology; College of Life and Environmental Science; Konkuk University; Seoul; 143-701; South Korea
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Keum YS, Park HW, Song HH, Kim BD, Kang BC, Kim JH. Metabolite analysis of long chain branched fatty acids and capsaicin biosynthesis in Capsicum annuum placenta. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s13765-012-1163-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Fan Z, Keum YS, Li QX, Shelver WL, Guo LH. Sensitive immunoassay detection of multiple environmental chemicals on protein microarrays using DNA/dye conjugate as a fluorescent label. ACTA ACUST UNITED AC 2012; 14:1345-52. [DOI: 10.1039/c2em10956e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Fan ZY, Keum YS, Li QX, Shelver WL, Guo LH. Development of indirect competitive fluorescence immunoassay for 2,2',4,4'-tetrabromodiphenyl ether using DNA/dye conjugate as antibody multiple labels. J Environ Sci (China) 2012; 24:1334-1340. [PMID: 23513455 DOI: 10.1016/s1001-0742(11)60929-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
An indirect competitive fluorescence immunoassay using a DNA/dye conjugate as antibody multiple labels was developed on 96-well plates for the identification and quantification of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) in aqueous samples. A hapten, 2,4,2'-tribromodiphenyl ether-4'-aldehyde, was synthesized, and was conjugated to bovine serum albumin to form a coating antigen. Specific recognition of the antigen by anti-PBDE antiserum was confirmed by a surface plasmon resonance measurement. In the immunoassay, the coating antigen was adsorbed on a 96-well plate first, and a sample, antiserum and biotinylated goat anti-rabbit secondary antibody were then added and reacted sequentially. A biotinylated, double-stranded DNA with 219 base pairs was attached to the secondary antibody by using streptavidin as a molecular bridge. In situ multiple labeling of the antibody was accomplished after addition of a DNA-binding fluorescent dye, SYBR Green I. The working range of the immunoassay for the BDE-47 standard was 3.1-390 microg/L, with an IC50 value of 15.6 microg/L. The calculated LOD of the immunoassay is 0.73 microg/L. The immunoassay demonstrated relatively high selectivity for BDE-47, showing very low cross-reactivity (< 3%) with BDE-15, BDE-153 and BDE-209. With a spiked river water sample containing 50 microg/L BDE-47, quantification by the immunoassay was 41.9 microg/L, which compared well with the standard GC-ECD method (45.7 microg/L). The developed immunoassay provides a rapid screening tool for polybrominated diphenyl ethers in environmental samples.
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Affiliation(s)
- Zi-Yan Fan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-environment Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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Abstract
The in vivo metabolism of a new herbicide pyribenzoxim (benzophenone Ο-[2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoyl]oxime) in rice was carried out using container trials. Two radiolabeled forms of [carbonyl-(14)C]pyribenzoxim (P1) and [ring-(14)C(U)]pyribenzoxim (P2) were treated separately as formulations for foliar treatment by single applications of 50 g of active ingredient (ai)/ha at the 4-6 leaves stage. At 0, 7, 30, and 60 days after treatment (DAT), samples of panicle, foliage/rest of plant, and roots were taken for analysis. Upon harvest (120 DAT), rice plants were separated into grain, husk, straw, and root parts. Total radioactive residues (TRRs) at each sampling date were determined to show that the final radioactive residues at harvest were low in grain, husk, straw, and roots, accounting for <17 ppb. The concentration of final residues in the rice plant decreased rapidly, and less than 0.1% of initial TRRs remained at harvest. At 7 DAT, metabolite 1 [M1, 2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoic acid] and two unknown compounds (other-1 and other-2) were detected in foliage extract, accounting for 3.5% TRRs (21.0 ppb), 3.1% TRRs (19.0 ppb), and 9.0% TRRs (54.3 ppb), respectively, while 26.1% of M1 was observed in solvent wash. Any other metabolites were not detected in the plant, including expected metabolite M3 (benzophenone oxime). On the basis of the results obtained, a metabolic pathway of pyribenzoxim in a rice plant was proposed.
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Affiliation(s)
- Hee-Ra Chang
- Environmental Toxicology Division, Toxicological Research Center, Hoseo University , 165 Sechul, Baebang, Asan, Chungnam 336-795, Korea
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Zhu YZ, Keum YS, Yang L, Lee H, Park H, Kim JH. Metabolism of a fungicide mepanipyrim by soil fungus Cunninghamella elegans ATCC36112. J Agric Food Chem 2010; 58:12379-12384. [PMID: 21047134 DOI: 10.1021/jf102980y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Mepanipyrim is a fungicide against several plant pathogens. However, no metabolic details have been established in fungi, which is the most important biomass in the natural environment. Cunninghamella elegans is a well-known fungal species with its strong resemblance to the mammalian xenobiotic metabolism. In this study, the detailed metabolic pathways of mepanipyrim were investigated with C. elegans. Approximately 87% of mepanipyrim was removed within 12 h with concomitant accumulation of nine metabolites. Structures of the metabolites were fully or tentatively identified with GC-MS and (1)H NMR. To determine the possible role of representative oxidative enzymes, piperonyl butoxide and methimazole were treated, and the kinetic responses of mepanipyrim and its metabolites were measured. Dose-dependent inhibition of metabolism was observed with piperonyl butoxide, while methimazole also inhibited the metabolism less effectively. The results indicate the possible involvement of cytochrome P450 and flavin-dependent monooxygenase in mepanipyrim metabolism. Comprehensive metabolic pathways can be deduced from the detailed analysis of metabolite profiles in control and inhibitor assays.
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Affiliation(s)
- Yong-Zhe Zhu
- College of Chemistry and Pharmacy, Qingdao Agricultural University, Changcheng Road, Chengyang, Qingdao City, Shandong Province 266-109, China
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Keum YS, Zhu YZ, Kim JH. Structure-inhibitory activity relationships of pyrrolnitrin analogues on its biosynthesis. Appl Microbiol Biotechnol 2010; 89:781-9. [PMID: 20865257 DOI: 10.1007/s00253-010-2872-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 08/24/2010] [Accepted: 08/25/2010] [Indexed: 11/29/2022]
Abstract
Pyrrolnitrin is a bacterial metabolite, served as a natural lead of agricultural fungicides. In a previous study, fenpiclonil was proven to inhibit the oxidative transformation of aminopyrrolnitrin to pyrrolnitrin, catalyzed by aminopyrrolnitrin oxidase (PrnD). This monooxygenase has an interesting catalytic activity of selective oxidation of aromatic amines, rather than aliphatic amines. However, its structural details are not well understood. In this study, various analogues of pyrrolnitrin were prepared to elucidate the structures of active site of PrnD through structure-activity relationships. In vivo pyrrolnitrin biosynthesis inhibition was determined with Burkholderia sp. O33 and Pseudomonas fluorescens Pf-5. Quantitative analysis of pyrrolnitrin and precursors indicates that 2,3-disubstituted phenyl at 3rd carbon and small substituents at 4th carbon of pyrrole are strictly required to give strong inhibitory effects. In addition, dissociable proton of pyrrole is also critical for inhibitory activity. Molecular simulation with homology-based PrnD model suggests a highly restricted conformational space in active site. The results may help more detailed understanding of this unusual enzyme. In addition, the information will be useful for the development of novel fungicide, compatible with pyrrolnitrin-producing bacterium.
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Affiliation(s)
- Young Soo Keum
- Department of Molecular Biotechnology, Konkuk University, Gwangjin-gu, Seoul, Republic of Korea.
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25
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Abstract
Pyrrolnitrin is a halogenated bacterial metabolite with antifungal and antibacterial activities which served as a lead structure of synthetic fungicides. Several pyrrolnitrin-producing bacteria are considered to be promising biopesticides. However, the application of these microorganisms is not straightforward since many synthetic pesticides usually coexist in agricultural fields and inevitably affect the efficacy of biocontrol agents. In this regard, effects of 25 xenobiotics, including 18 pesticides, were investigated for pyrrolnitrin biosynthesis by Burkholderia sp. O33 and Pseudomonas fluorescens Pf-5. Strong inhibition of pyrrolnitrin synthesis was observed in 9 chemicals, including 6 pesticides, while glyphosate and validamycin enhance biosynthesis. Fenpiclonil and fludioxonil strongly inhibit the oxidative transformation of aminopyrrolnitrin to pyrrolnitrin. Halogenation reaction to aminopyrrolnitrin was reduced by methimazole, a well-known flavin-dependent monooxygenase inhibitor. Most pesticides gave moderate growth inhibitory effects. The results suggested that synthetic chemicals can modulate the efficacy of pyrrolnitrin producing bacteria, through the inhibition of cell growth or pyrrolnitrin biosynthesis. Pathway specific inhibition by fenpiclonil, fludioxonil, and methimazole will give structural insights of corresponding enzymes.
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Affiliation(s)
- Young Soo Keum
- Department of Agricultural Biotechnology, Seoul National University, Seoul, Republic of Korea
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26
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Keum YS, Lee YJ, Lee YH, Kim JH. Effects of nutrients on quorum signals and secondary metabolite productions of Burkholderia sp. O33. J Microbiol Biotechnol 2010; 19:1142-9. [PMID: 19884772 DOI: 10.4014/jmb.0901.465] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
Several bioactive metabolites, including pyrrolnitrin, Nacylhomoserine lactones, and polyhydroxyalkanoates were isolated from Burkholderia sp. O33. Effects of various nutrients, including sugars, gluconolactone, glycerol, tryptophan, chloride, and zinc were investigated in relation to the production of these metabolites. Logarithmic increase of pyrrolnitrin was observed between 2-5 days and reached a maximum at 7-10 days. Tryptophan concentration reached the maximum at 3 days, whereas 7-chlorotryptophan was gradually increased throughout the studies. Among various carbon sources, gluconolactone, trehalose, and glycerol enhanced pyrrolnitrin production, whereas strong inhibitory effects were found with glucose. Relative concentrations of pyrrolnitrin and its precursors were in the order of pyrrolnitrin >> dechloroaminopyrrolnitrin or aminopyrrolnitrin throughout the experiments. Among three N-acylhomoserine lactones, the N-octanoyl analog was the most abundant quorum sensing signal, of which the concentrations reached the maximum in 2-3 days, followed by a rapid dissipation to trace level. No significant changes in pyrrolnitrin biosynthesis were observed by external addition of N-acylhomoserine lactones. Polyhydroxyalkanoates accumulated up to 3-4 days and decreased slowly thereafter. According to the kinetic analyses, no strong correlations were found between the levels of pyrrolnitrin, N-acylhomoserine lactones,and Polyhydroxyalkanoates.
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Affiliation(s)
- Young Soo Keum
- Department of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Korea.
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Abstract
Methoxychlor is considered as pro-estrogen, while some of its metabolites are more potent endocrine disruptors than the parent insecticide. Major activation of methoxychlor is through cytochrome P450-catalyzed demethylation to bisphenol A-like metabolites. Cunninghamella elegans is a well-known fungal species with its strong resemblance of the xenobiotic metabolism of the mammalian system. In this study, the metabolism of methoxychlor was investigated with the corresponding organism. Methoxychlor was rapidly transformed to approximately 11 metabolites in phase I metabolism, including oxidation, hydroxylation, and dechlorination. Concentrations of phase I metabolites reached a maximum at 4-6 days and gradually decreased until the end of the experiments. Most metabolites from the phase I reaction were further transformed to sugar conjugates. Approximately 11 or more glucose conjugates were found in culture supernatants and gradually increased, while no glucuronides were observed throughout the experiments. Piperonyl butoxide and chlorpyrifos strongly inhibit the degradation of methoxychlor and concomitant accumulation of metabolites, indicating cytochrome P450 mediated metabolism. Little or no glycosides were detected in chlorpyrifos- and piperonyl butoxide-treated cultures. From the results, Cunninghamella elegans has shown strong similarities of the phase I metabolism of methoxychlor, while the conjugation reaction is different from those of animal metabolism.
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Affiliation(s)
- Young Soo Keum
- Department of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Korea
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Keum YS, Lee YJ, Kim JH. Metabolism of nitrodiphenyl ether herbicides by dioxin-degrading bacterium Sphingomonas wittichii RW1. J Agric Food Chem 2008; 56:9146-9151. [PMID: 18778066 DOI: 10.1021/jf801362k] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nitrodiphenyl ether herbicides, including chlomethoxyfen, nitrofen, and oxyfluorfen are potent herbicides. Some metabolites and parent compounds are considered as possible mutagens and endocrine disruptors. Both properties pose serious hygienic and environmental risks. Sphingomonas wittichii RW1 is a well-known degrader of polychlorinated dibenzo- p-dioxins, dibenzofurans, and diphenyl ethers. However, no detailed research of its metabolic activity has been performed against pesticides with a diphenyl ether scaffold. In this study, we report S. wittichii RW1 as a very potent diphenyl ether herbicide-metabolizing bacterium with broad substrate specificity. The structures of metabolites were determined by instrumental analysis and synthetic standards. Most pesticides were rapidly removed from the culture medium in the order of nitrofen > oxyfluorfen > chlomethoxyfen. In general, herbicides were degraded through the initial reduction and N-acetylation of nitro groups, followed by ether bond cleavage. Relatively low concentrations of phenolic and catecholic metabolites throughout the study suggested that these metabolites were rapidly metabolized and incorporated into primary metabolism. These results indicate that strain RW1 has very versatile metabolic activities over a wide range of environmental contaminants.
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Affiliation(s)
- Young Soo Keum
- Department of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Korea
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Keum YS, Seo JS, Li QX, Kim JH. Comparative metabolomic analysis of Sinorhizobium sp. C4 during the degradation of phenanthrene. Appl Microbiol Biotechnol 2008; 80:863-72. [PMID: 18668240 PMCID: PMC7419452 DOI: 10.1007/s00253-008-1581-4] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2008] [Revised: 06/16/2008] [Accepted: 06/18/2008] [Indexed: 11/30/2022]
Abstract
Comparative metabolic responses of Sinorhizobium sp. C4 were investigated. Comprehensive metabolites profiles, including polar metabolites, fatty acids, and polyhydroxyalkanoates were evaluated through untargeted metabolome analyses. Intracellular metabolomes during the degradation of phenanthrene were compared with those from natural carbon sources. Principal component analysis showed a clear separation of metabolomes of phenanthrene degradation from other carbon sources. Shift to more hydrophobic fatty acid was observed from the analysis of fatty acid methyl ester. Polyhydroxyalkanoate from strain C4 was composed mainly with 3-hydroxybutyric acid and small amount of 3-hydroxypentanoic acid, while the monomeric composition was independent on carbon sources. However, the amount of polyhydroxyalkanoates during degradation of phenanthrene was 50–210% less than those from other carbon sources. Among 207 gas chromatography–mass spectrometry peaks from the polar metabolite fraction, 60% of the peaks were identified and compared. Several intermediates in tricarboxylic acid cycles and glycolysis were increased during phenanthrene degradation. Accumulation of trehalose was also evident in the phenanthrene-treated bacterium. Some amino acid, including branched amino acids, glycine, homoserine, and valine, were also increased, while more than 70% of identified metabolites were decreased during the phenanthrene metabolism. Accumulation of sulfur amino acids and nicotinic acid suggested the possible oxidative stress conditions during phenanthrene metabolism.
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Affiliation(s)
- Young Soo Keum
- Department of Agricultural Biotechnology, Seoul National University, Gwanak-Gu, Seoul, Republic of Korea
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30
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Hou S, Saw JH, Lee KS, Freitas TA, Belisle C, Kawarabayasi Y, Donachie SP, Pikina A, Galperin MY, Koonin EV, Makarova KS, Omelchenko MV, Sorokin A, Wolf YI, Li QX, Keum YS, Campbell S, Denery J, Aizawa SI, Shibata S, Malahoff A, Alam M. Genome sequence of the deep-sea gamma-proteobacterium Idiomarina loihiensis reveals amino acid fermentation as a source of carbon and energy. Proc Natl Acad Sci U S A 2004; 101:18036-41. [PMID: 15596722 PMCID: PMC539801 DOI: 10.1073/pnas.0407638102] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We report the complete genome sequence of the deep-sea gamma-proteobacterium, Idiomarina loihiensis, isolated recently from a hydrothermal vent at 1,300-m depth on the Loihi submarine volcano, Hawaii. The I. loihiensis genome comprises a single chromosome of 2,839,318 base pairs, encoding 2,640 proteins, four rRNA operons, and 56 tRNA genes. A comparison of I. loihiensis to the genomes of other gamma-proteobacteria reveals abundance of amino acid transport and degradation enzymes, but a loss of sugar transport systems and certain enzymes of sugar metabolism. This finding suggests that I. loihiensis relies primarily on amino acid catabolism, rather than on sugar fermentation, for carbon and energy. Enzymes for biosynthesis of purines, pyrimidines, the majority of amino acids, and coenzymes are encoded in the genome, but biosynthetic pathways for Leu, Ile, Val, Thr, and Met are incomplete. Auxotrophy for Val and Thr was confirmed by in vivo experiments. The I. loihiensis genome contains a cluster of 32 genes encoding enzymes for exopolysaccharide and capsular polysaccharide synthesis. It also encodes diverse peptidases, a variety of peptide and amino acid uptake systems, and versatile signal transduction machinery. We propose that the source of amino acids for I. loihiensis growth are the proteinaceous particles present in the deep sea hydrothermal vent waters. I. loihiensis would colonize these particles by using the secreted exopolysaccharide, digest these proteins, and metabolize the resulting peptides and amino acids. In summary, the I. loihiensis genome reveals an integrated mechanism of metabolic adaptation to the constantly changing deep-sea hydrothermal ecosystem.
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Affiliation(s)
- Shaobin Hou
- Department of Microbiology, University of Hawaii, Snyder Hall 111, 2538 The Mall, Honolulu, HI 96822, USA
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Keum YS, Li QX. Fungal laccase-catalyzed degradation of hydroxy polychlorinated biphenyls. Chemosphere 2004; 56:23-30. [PMID: 15109876 DOI: 10.1016/j.chemosphere.2004.02.028] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2003] [Revised: 02/05/2004] [Accepted: 02/10/2004] [Indexed: 05/13/2023]
Abstract
Hydroxy polychlorinated biphenyls (hydroxy PCBs) are toxic metabolites of PCBs. Their toxicity such as strong endocrine disruption demands effective remediation methods. Laccases from Trametes versicolor and Pleurotus ostreatus were tested to degrade hydroxy PCBs. Optimum pHs for both enzymes were around 4.0. Laccase from T. versicolor degrades hydroxy PCBs more rapidly than that from P. ostreatus. The enzymatic activities remained little changes in up to 10% organic solvents, but decreased rapidly in more than 10% acetone, acetonitrile or DMSO. Degradation rate constants decreased with increase of chlorination and no degradation was observed with tetra-, penta- and hexa-chloro hydroxy PCBs in non-mediated reactions. However, the tetra- to hexa-chloro hydroxy PCBs were degraded by laccase from T. versicolor in the presence of the mediator 2,2,6,6-tetramethylpiperidine-N-oxy radical. The other mediators, 4-ethyl-2-methoxyphenol, 2,2'-azino-bis(3-ethylbenzthiazoline sulfonic acid) diammonium salt and 1-hydroxybenzotriazole and humic acid, also enhanced degradation of all the hydroxy PCBs except 4-hydroxy-2',3,3',4',5,5'-hexachlorobiphenyl. The results showed that 3-hydroxy biphenyl was more resistant to laccase degradation than 2- or 4-hydroxy analogues. Significant linear-correlations (coefficient of determination, r2 = 0.9097 and 0.8186 for laccases from P. ostreatus and T. versicolor, respectively) were found between the ionization potentials and the removal rate constants of hydroxy PCBs.
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Affiliation(s)
- Young Soo Keum
- Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, 1955 East-West Road, Ag Sci 218, Honolulu, HI 96822, USA
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McQuate GT, Keum YS, Sylva CD, Li QX, Jang EB. Active ingredients in cade oil that synergize attractiveness of alpha-ionol to male Bactrocera latifrons (Diptera: Tephritidae). J Econ Entomol 2004; 97:862-870. [PMID: 15279265 DOI: 10.1603/0022-0493(2004)097[0862:aiicot]2.0.co;2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Cade oil, a commercially available essential oil produced by destructive distillation of juniper, Juniperus oxycedrus L., twigs, is known to synergize the attractancy of alpha-ionol to male Bactrocera latifrons (Hendel). Through chemical fractionation and outdoor olfactometer-based bioassays, seven compounds in cade oil were identified that potentially could provide some level of synergism. Tests with sterile laboratory flies showed that four of the seven compounds (eugenol, isoeugenol, 2-methoxy-4-ethylphenol, and 2-methoxy-4-propylphenol), together with a closely related compound not found in cade oil, 2-methoxy-4-methylphenol, are capable of synergizing the attractiveness of alpha-ionol to male B. latifrons under field conditions. The similarity in structures of these five synergistic compounds shows that there is a response to a core 2-methoxyphenol structure, with fly response little affected by some variation in the composition of the side chain on the number 4 carbon. Because identified synergists were structurally similar, only one compound, eugenol, was selected for further field studies. In an 8-wk weathering test, using released sterile flies, traps baited with alpha-ionol + eugenol had catches comparable with catches at traps baited with alpha-ionol + cade oil, with catches generally increased with a higher eugenol loading. For both eugenol and cade oil, catches tended to be better when these synergists were deployed on separate wicks from the alpha-ionol. Eugenol and alpha-ionol, however, were unable to provide attraction comparable with that of cade oil and alpha-ionol in tests with wild fly populations.
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Affiliation(s)
- Grant T McQuate
- USDA-ARS, U.S. Pacific Basin Agricultural Research Center, P.O. Box 4459, Hilo, HI 96720, USA.
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Affiliation(s)
- Y S Keum
- Department of Molecular Biosciences and Bioengineering, University of Hawaii, 1955 East-West Road, Honolulu, HI 96822, USA
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Keum YS, Liu KH, Seo JS, Kim JH, Kim K, Kim YH, Kim PJ. Dissipation of foliar residues of diafenthiuron and its metabolites. Bull Environ Contam Toxicol 2002; 68:845-851. [PMID: 12012060 DOI: 10.1007/s00128-002-0032-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- Y S Keum
- School of Agricultural Biotechnology, Seoul National University, Seodundong 103, Suwon 441-744, Korea
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Abstract
Recently, there have been considerable efforts to search for naturally occurring substances that can inhibit, reverse, or retard the multi-stage carcinogenesis. A wide array of phenolic substances derived from edible and medicinal plants have been reported to possess anticarcinogenic and antimutagenic activities and in many cases, the chemopreventive activities of phytochemicals are associated with their anti-inflammatory and/or antioxidative properties. Panax ginseng C.A. Meyer cultivated in Korea has been widely used in traditional herbal medicine for the treatment of various diseases. Certain fractions or purified ingredients of ginseng have been shown to exert anticarcinogenic and antimutagenic activities. Our previous studies have revealed that the methanol extract of heat-processed Panax ginseng C.A. Meyer attenuates the lipid peroxidation in rat brain homogenates and is also capable of scavenging superoxide generated by xanthine- xanthine oxidase or by 12-O-tetradecanoylphorbol-13-acetate (TPA) in differentiated human promyelocytic leukemia (HL-60) cells. Topical application of the same extract onto shaven backs of female ICR mice also suppressed TPA-induced skin tumor promotion. Likewise, topical application of ginsenoside Rg3, one of the constituents of heat-treated ginseng, significantly inhibited TPA-induced mouse epidermal ornithine decarboxylase activity and skin tumor promotion. Expression of cyclooxygenase-2 (COX-2) in TPA-stimulated mouse skin was markedly suppressed by Rg3 pretreatment. In addition, Rg3 inhibited TPA-stimulated activation of NF-kappaB and extracellular-regulated protein kinase (ERK), one of the mitogen-activated protein (MAP) kinase in mouse skin and also in cultured human breast epithelial cells (MCF-10A).
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Affiliation(s)
- Y J Surh
- College of Pharmacy, Seoul National University, Seoul, Korea.
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Surh YJ, Chun KS, Cha HH, Han SS, Keum YS, Park KK, Lee SS. Molecular mechanisms underlying chemopreventive activities of anti-inflammatory phytochemicals: down-regulation of COX-2 and iNOS through suppression of NF-kappa B activation. Mutat Res 2001; 480-481:243-68. [PMID: 11506818 DOI: 10.1016/s0027-5107(01)00183-x] [Citation(s) in RCA: 1120] [Impact Index Per Article: 48.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A wide array of phenolic substances, particularly those present in edible and medicinal plants, have been reported to possess substantial anticarcinogenic and antimutagenic activities. The majority of naturally occurring phenolics retain antioxidative and anti-inflammatory properties which appear to contribute to their chemopreventive or chemoprotective activity. Cyclooxygenase-2 (COX-2) inducible and nitric oxide synthase (iNOS) are important enzymes that mediate inflammatory processes. Improper up-regulation of COX-2 and/or iNOS has been associated with pathophysiology of certain types of human cancers as well as inflammatory disorders. Since inflammation is closely linked to tumor promotion, substances with potent anti-inflammatory activities are anticipated to exert chemopreventive effects on carcinogenesis, particularly in the promotion stage. Examples are curcumin, a yellow pigment of turmeric (Curcuma longa L., Zingiberaceae), the green tea polyphenol epigallocatechin gallate (EGCG), and resveratrol from grapes (Vitis vinifera, Vitaceae) that strongly suppress tumor promotion. Recent studies have demonstrated that eukaryotic transcription factor nuclear factor-kappa B (NF-kappa B) is involved in regulation of COX-2 and iNOS expression. Several chemopreventive phytochemicals have been shown to inhibit COX-2 and iNOS expression by blocking improper NF-kappa B activation. Multiple lines of compelling evidence indicate that extracellular-regulated protein kinase and p38 mitogen-activated protein kinase are key elements of the intracellular signaling cascades responsible for NF-kappa B activation in response to a wide array of external stimuli. Curcumin, EGCG and resveratrol have been shown to suppress activation of NF-kappa B. One of the plausible mechanisms underlying inhibition of NF-kappa B activation by aforementioned phytochemicals involves repression of degradation of the inhibitory unit I kappa B alpha, which hampers subsequent nuclear translocation of the functionally active subunit of NF-kappa B.
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Affiliation(s)
- Y J Surh
- College of Pharmacy, Seoul National University, Shinlim-dong, Kwanak-ku, Seoul 151-742, South Korea.
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Han SS, Keum YS, Seo HJ, Chun KS, Lee SS, Surh YJ. Capsaicin suppresses phorbol ester-induced activation of NF-kappaB/Rel and AP-1 transcription factors in mouse epidermis. Cancer Lett 2001; 164:119-26. [PMID: 11179825 DOI: 10.1016/s0304-3835(01)00378-0] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Capsaicin, the principal pungent ingredient of hot chili peppers, has anti-inflammatory and analgesic properties and is currently used as a topical cream for the management of various neuropathic conditions. In the present study, topical application of capsaicin onto dorsal skin of female ICR mice strongly suppressed phorbol ester-stimulated activation of NF-kappaB via blockade of IkappaB-alpha degradation with subsequent inhibition of nuclear translocation of the functionally active NF-kappaB subunit, p65. Likewise, phorbol ester-induced activation of activator protein-1 (AP-1) was abolished by capsaicin pretreatment. Since altered transactivation of NF-kappaB and AP-1 has been implicated for neoplastic transformation and progression, the suppression of these transcription factors by capsaicin may account for its previously reported chemopreventive effects on mouse skin tumorigenesis as well as inflammation.
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Affiliation(s)
- S S Han
- College of Pharmacy, Seoul National University, Shinlim-dong, Kwanak-gu, 151-742, Seoul, South Korea
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Keum YS, Park KK, Lee JM, Chun KS, Park JH, Lee SK, Kwon H, Surh YJ. Antioxidant and anti-tumor promoting activities of the methanol extract of heat-processed ginseng. Cancer Lett 2000; 150:41-8. [PMID: 10755385 DOI: 10.1016/s0304-3835(99)00369-9] [Citation(s) in RCA: 250] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heat treatment of Panax ginseng C.A. Meyer at a temperature higher than that applied to the conventional preparation of red ginseng yielded a mixture of saponins with potent antioxidative properties. Thus, the methanol extract of heat-processed neoginseng (designated as 'NGMe') attenuated lipid peroxidation in rat brain homogenates induced by ferric ion or ferric ion plus ascorbic acid. Furthermore, the extract protected against strand scission in phiX174 supercoiled DNA induced by UV photolysis of H2O2, and was also capable of scavenging superoxide generated by xanthine-xanthine oxidase or by 12-O-tetradecanoylphorbol-13-acetate (TPA) in differentiated human promyelocytic leukemia (HL-60) cells. Topical application of NGMe onto shaven backs of female ICR mice 10 min prior to TPA, significantly ameliorated skin papillomagenesis initiated by 7,12-dimethylbenz[a]anthracene. Moreover, TPA-induced enhancement of epidermal ornithine decarboxylase (ODC) activity and ODC mRNA expression was abolished by a topical dose (0.68 mg) of NGMe. Likewise, TPA-induced production of tumor necrosis factor- in mouse skin was inhibited by NGMe pretreatment.
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MESH Headings
- 9,10-Dimethyl-1,2-benzanthracene/adverse effects
- Animals
- Anticarcinogenic Agents/pharmacology
- Antioxidants/pharmacology
- Bacteriophage phi X 174/genetics
- Brain/drug effects
- Brain/metabolism
- Carcinogens/adverse effects
- DNA, Viral/drug effects
- DNA, Viral/genetics
- DNA, Viral/radiation effects
- Enzyme Activation/drug effects
- Female
- Gene Expression Regulation, Enzymologic/drug effects
- HL-60 Cells
- Hot Temperature
- Humans
- Hydrogen Peroxide/adverse effects
- Lipid Peroxidation/drug effects
- Male
- Methanol
- Mice
- Mice, Inbred ICR
- Ornithine Decarboxylase/drug effects
- Ornithine Decarboxylase/genetics
- Ornithine Decarboxylase/metabolism
- Panax/chemistry
- Papilloma/chemically induced
- Papilloma/prevention & control
- Plant Extracts/chemistry
- Plant Extracts/pharmacology
- Plants, Medicinal
- RNA, Messenger/drug effects
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Sprague-Dawley
- Skin/drug effects
- Skin/metabolism
- Skin/pathology
- Skin Neoplasms/chemically induced
- Skin Neoplasms/prevention & control
- Superoxides/metabolism
- Tetradecanoylphorbol Acetate/adverse effects
- Tumor Necrosis Factor-alpha/drug effects
- Tumor Necrosis Factor-alpha/metabolism
- Ultraviolet Rays/adverse effects
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Affiliation(s)
- Y S Keum
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, South Korea
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Surh YJ, Han SS, Keum YS, Seo HJ, Lee SS. Inhibitory effects of curcumin and capsaicin on phorbol ester-induced activation of eukaryotic transcription factors, NF-kappaB and AP-1. Biofactors 2000; 12:107-12. [PMID: 11216470 DOI: 10.1002/biof.5520120117] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Recently, considerable attention has been focused on identifying dietary and medicinal phytochemicals that can inhibit, retard or reverse the multi-stage carcinogenesis. Spices and herbs contain phenolic substances with potent antioxidative and chemopreventive properties. Curcumin, a yellow colouring agent from turmeric and capsaicin, a pungent principle of red pepper exhibit profound anticarcinogenic and antimutagenic activities. Two well-defined eukaryotic transcription factors, nuclear factor-kappa B (NF-kappaB) and activator protein 1 (AP-1) have been implicated in pathogenesis of many human diseases including cancer. These transcription factors are known to be activated by a wide array of external stimuli, such as tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA), tumor necrosis factor, reactive oxygen species, bacterial lipopolysaccharide, and ultraviolet. In the present study, we found that topical application of TPA onto dorsal skin of female ICR mice resulted in marked activation of epidermal NF-kappaB and AP-1. Curcumin and capsaicin, when topically applied prior to TPA, significantly attenuated TPA-induced activation of each transcription factor in mouse skin. Likewise, both compounds inhibited NF-kappaB and AP-1 activation in cultured human promyelocytic leukemia (HL-60) cells stimulated with TPA. Based on these findings, it is likely that curcumin and capsaicin exert anti-tumor promotional effects through suppression of the tumor promoter-induced activation of transcription factors, NF-kappaB and AP-1.
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Affiliation(s)
- Y J Surh
- College of Pharmacy, Seoul National University, Kwanak-gu, Korea.
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