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Huang H, Tong Y, Lyu X, Zhao W, Yang R. Ultrasound and lactic/malic acid treatment for mitten crab decontamination: Efficacy and mechanisms against A. hydrophila. ULTRASONICS SONOCHEMISTRY 2025; 115:107294. [PMID: 40023899 PMCID: PMC11919395 DOI: 10.1016/j.ultsonch.2025.107294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2025] [Revised: 02/24/2025] [Accepted: 02/26/2025] [Indexed: 03/04/2025]
Abstract
The Chinese mitten crab (Eriocheir sinensis), recognized as a high-value aquatic product, necessitates effective cleaning to ensure both safety and quality. Conventional cleaning methods frequently fail to eliminate biofilms and pathogenic bacteria, such as Aeromonas hydrophila, which pose significant health risks and contribute to spoilage. This study explores the bactericidal efficacy and underlying mechanisms of ultrasound treatment combined with a lactic acid and malic acid complex solution for decontaminating crabs and enhancing food safety. Employing a range of methodologies, including microscopic imaging, live/dead staining, RT-qPCR, and texture and microstructure analysis, the results indicate that the combined treatment significantly reduced A. hydrophila counts by 4.16 lg CFU/mL and induced substantial bacterial membrane damage, as evidenced by scanning electron microscopy (SEM). Gene expression analysis revealed a pronounced downregulation of biofilm-related genes. Notably, the treatment also preserved the texture and sensory properties of crab meat, thereby ensuring high product quality. These findings suggest that the application of ultrasound in conjunction with a lactic acid-malic acid solution represents a green and effective strategy for improving food safety and quality in the processing of aquatic products, offering a sustainable and eco-friendly alternative to traditional cleaning methods.
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Affiliation(s)
- Han Huang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Yanjun Tong
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Xiaomei Lyu
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Wei Zhao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Ruijin Yang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
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Challana V, Kaimal AM, Shirkole S, Sahoo AK. Comparative analysis and investigation of ultrasonication on juice yield and bioactive compounds of kinnow fruit using RSM and ANN models. Sci Rep 2025; 15:9859. [PMID: 40118961 PMCID: PMC11928472 DOI: 10.1038/s41598-025-94640-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2024] [Accepted: 03/17/2025] [Indexed: 03/24/2025] Open
Abstract
Ultrasonication (US) is a promising non-thermal technique widely applied in the food sector for improving the extraction process and preserving nutrients. Kinnow fruits have yields of 40-60% juice; the rest of the parts are discarded as waste. The study explored ultrasonication (US) as a pre-treatment to improve juice expression and preserve heat-sensitive nutrients such as vitamin C. The optimization of US treatment was done by varying treatment time (30-90 min) and temperature (30-70 °C) using response surface methodology (RSM). Under optimal conditions, juice yield increased by 14.52% with 4.34% vitamin C loss. The artificial neural network (ANN) model (2-9-1 for yield and 2-10-1 for vitamin C) outperformed the RSM in terms of fitting, predictive ability and accuracy. The kinetic study further indicated that longer US treatment enhanced the total soluble solids (TSS), total phenolic content (TPC), and total color change (ΔE), whereas antioxidant activity and vitamin C content decreased. The yield followed an inverted parabola trend during the kinetic study; yield increased with a k-value of 0.0582 until 30 min and then declined until 60 min with a 0.0253 k-value. These results suggested that US technology has the potential to improve juice yield and maintain nutritional quality.
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Affiliation(s)
- Vimal Challana
- Department of Food Engineering and Technology, Institute of Chemical Technology Mumbai, ICT-IOC Campus, Bhubaneswar, 751013, India.
| | - Admajith M Kaimal
- Department of Food Engineering and Technology, Institute of Chemical Technology Mumbai, ICT-IOC Campus, Bhubaneswar, 751013, India
| | - Shivanand Shirkole
- Department of Food Engineering and Technology, Institute of Chemical Technology Mumbai, ICT-IOC Campus, Bhubaneswar, 751013, India
- Department of Food Technology, School of Engineering and Technology, D. Y. Patil Agriculture and Technical University, Talsande, Kolhapur, 416112, India
| | - Akshaya K Sahoo
- Department of Food Engineering and Technology, Institute of Chemical Technology Mumbai, ICT-IOC Campus, Bhubaneswar, 751013, India.
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Yoon S, Lee HW, Bak JYJ, Min SC. Microbial decontamination of fresh-cut celery using simultaneous ultrasound and plasma-activated water treatment. Int J Food Microbiol 2025; 432:110912. [PMID: 39317577 DOI: 10.1016/j.ijfoodmicro.2024.110912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2024] [Revised: 09/04/2024] [Accepted: 09/09/2024] [Indexed: 09/26/2024]
Abstract
This study investigated an ultrasound (US) treatment strategy in plasma-activated water (PAW) (UP treatment) to inactivate indigenous aerobic bacteria, Escherichia coli O157:H7, and Listeria monocytogenes in fresh-cut celery. Both plasma discharge and US treatment times contributed to the inactivation of indigenous bacteria in celery. The predicted optimal UP treatment conditions included a discharge time of 61.5 min and treatment time of 338 s, resulting in the inactivation of indigenous bacteria, E. coli O157:H7, and L. monocytogenes by 2.7, 1.7, and 3.2 log CFU/g, respectively. With an increase in plasma discharge time or US treatment time, the oxidation-reduction potential and electrical conductivity values of PAW increased, while the pH decreased. UP treatment effectively inactivated bacteria non-thermally, without altering the color of celery. Furthermore, UP treatment led to an increase in cell lipid peroxidation, reactive oxygen species production, and the number of non-viable E. coli O157:H7 and L. monocytogenes cells with membrane damage. This study highlights the potential of UP treatment for bacterial decontamination of fresh-cut celery.
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Affiliation(s)
- Sohee Yoon
- Department of Food Science and Technology, Seoul Women's University, 621, Hwarangro, Nowon-gu, Seoul 01797, Republic of Korea
| | - Hye Won Lee
- Department of Food Science and Technology, Seoul Women's University, 621, Hwarangro, Nowon-gu, Seoul 01797, Republic of Korea
| | - Ji-Yeong Jessica Bak
- Department of Food Science and Technology, Seoul Women's University, 621, Hwarangro, Nowon-gu, Seoul 01797, Republic of Korea
| | - Sea C Min
- Department of Food Science and Technology, Seoul Women's University, 621, Hwarangro, Nowon-gu, Seoul 01797, Republic of Korea.
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Alam M, Islam MS, Jahan MI, Deb AS, Rahman A, Islam Z, Chowdhury AI, Islam KM, Hossain MZ, Ahmed D, Arifeen SE, Gurley ES, Rahman M. A novel virulent core genome multilocus sequence type CT 11424 of Listeria monocytogenes isolate causing stillbirth in Bangladesh. BMC Microbiol 2025; 25:61. [PMID: 39901076 PMCID: PMC11792674 DOI: 10.1186/s12866-024-03650-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Accepted: 11/14/2024] [Indexed: 02/05/2025] Open
Abstract
BACKGROUND Listeria monocytogenes is a foodborne pathogen that can lead to severe pregnancy outcomes. This study reports the clinical and genomic characteristics of a Listeria-mediated stillbirth identified in January 2022 through the Child Health and Mortality Prevention Surveillance (CHAMPS) project in Bangladesh. The Lm-BD-CHAMPS-01 isolate was recovered from the blood and cerebrospinal fluid (CSF) of a male stillborn. Maternal history, clinical, and demographic data were collected by the CHAMPS surveillance platform. An expert panel evaluated all reports to determine the role of L. monocytogenes infection in the causal chain of stillbirth. Genomic characterization included multilocus sequence typing (MLST), core genome MLST (cgMLST), serotyping, and the presence or absence of virulence genes. Genetic divergence and phylogenetic analyses were conducted to determine the relationship with other reported isolates globally. RESULTS The isolate Lm-BD-CHAMPS-01 was identified as a novel cgMLST CT11424. It belonged to ST 308, Serotype 4b, Clonal Complex 1, and Phylogenetic Lineage 1. Key L. monocytogenes virulence genes facilitating the crossing of the placental barrier, including full-length inlA, LIPI-1, and LIPI-3, were detected. The isolate was closely related to clinical L. monocytogenes isolates, as determined by GrapeTree based on cgMLST. SNP-based phylogenetic analysis found Lm-BD-CHAMPS-01 to be the most distant from other CC1 isolates in the database. Possible sources of infection included the consumption of contaminated raw vegetables or exposure to pigeons. CONCLUSIONS This is the first genome sequence of clinical L. monocytogenes from Bangladesh, which also caused stillbirth. Rural healthcare professionals should be aware of L. monocytogenes infection risks during pregnancy. Pregnant women should be counseled on the dangers of exposure to animals or birds and consumption of potentially contaminated raw food to prevent adverse pregnancy outcomes due to L. monocytogenes infection.
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Affiliation(s)
- Muntasir Alam
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh.
| | - Md Saiful Islam
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
- Division of Genomics & Transcriptomics, Joint Research Center for Human Retrovirus Infection, Kumamoto University, Kumamoto, Japan
| | - M Ishrat Jahan
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
- Division of Genomics & Transcriptomics, Joint Research Center for Human Retrovirus Infection, Kumamoto University, Kumamoto, Japan
| | - Arpita Shyama Deb
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Afruna Rahman
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Zahidul Islam
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Atique Iqbal Chowdhury
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Kazi Munisul Islam
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Mohammad Zahid Hossain
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Dilruba Ahmed
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Shams El Arifeen
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
| | - Emily S Gurley
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
- Infectious Disease Epidemiology, Johns Hopkins University, Baltimore, MD, USA
| | - Mustafizur Rahman
- International Centre for Diarrhoeal Disease Research, Infectious Diseases Division, 68 Shaheed Tajuddin Ahmed Sarani, (icddr,b), Dhaka, Mohakhali, 1212, Bangladesh
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Jiang YH, Zhao YT, Xin WG, Liang M, Song JJ, Suo HY. Synergistic inactivation effect and mechanism of ultrasound combined with Zanthoxylum schinifolium essential oil nanoemulsions against Escherichia coli O157:H7 and its application on fresh-cut cucumber. Int J Food Microbiol 2025; 428:110962. [PMID: 39566379 DOI: 10.1016/j.ijfoodmicro.2024.110962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Revised: 10/11/2024] [Accepted: 10/31/2024] [Indexed: 11/22/2024]
Abstract
Fresh-cut produce is often contaminated with Escherichia coli O157, posing a significant risk to public health. This study investigated the synergistic inactivation effect and underlying mechanism of ultrasound (US) combined with Zanthoxylum schinifolium essential oil nanoemulsion (ZEO-NE) against E. coli O157:H7, and explored its potential application in fresh-cut cucumbers. The results demonstrated that combined treatment of US and ZEO-NE significantly reduced the viable counts of E. coli O157:H7 compared to treatment with US or ZEO-NE alone. In particular, US (20 kHz, 345 W/cm2) + ZEO-NE (1.0 mg/mL) treatment for 12 min achieved an 8.91 log colony-forming units (CFU)/mL reduction in viable counts of E. coli O157:H7. Moreover, biofilm formation assay revealed that US+EO-NE treatment significantly reduced mobility, altered surface properties, and inhibited biofilm formation of E. coli O157:H7 cells compared to single treatments. The synergistic inactivation mechanism of US+ZEO-NE treatment against E. coli O157:H7 was revealed to involve increased cell membrane permeability, resulting in leakage of nucleic acids, proteins, and LDH, AKP, and ATP, disruption of cell membrane integrity, and alterations in membrane potential. Additionally, the US+ZEO-NE treatment induced reactive oxygen species accumulation and disrupted cell morphology, ultimately leading to E. coli O157:H7 cell death. Notably, the US+EO-NE treatment also significantly reduced the E. coli O15:H7 counts in fresh-cut cucumbers compared to single treatments, without adversely affecting the quality and sensory properties of the produce during storage at 4 °C for 12 days. Overall, these findings suggest that US+EO-NE is a promising technique for bacterial inactivation, and holds potential for improving microbial safety in fresh-cut produce.
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Affiliation(s)
- Yu-Hang Jiang
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Yu-Ting Zhao
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Wei-Gang Xin
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Ming Liang
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Jia-Jia Song
- College of Food Science, Southwest University, Chongqing 400715, China; Chongqing Agricultural-Product Processing Technology Innovation Platform, Southwest University, Chongqing 400715, China
| | - Hua-Yi Suo
- College of Food Science, Southwest University, Chongqing 400715, China; Chongqing Agricultural-Product Processing Technology Innovation Platform, Southwest University, Chongqing 400715, China; Citrus Research Institute, National Citrus Engineering Research Center, Southwest University, Chongqing 400715, China.
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Wang J, Zhou N, Ma S, Yang X, Xing J. Preservation of minimally processed carrots using the combination of ultrasound and mild heat ascorbic acid. ULTRASONICS SONOCHEMISTRY 2024; 111:107086. [PMID: 39348788 PMCID: PMC11460623 DOI: 10.1016/j.ultsonch.2024.107086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2024] [Revised: 09/24/2024] [Accepted: 09/26/2024] [Indexed: 10/02/2024]
Abstract
Ultrasound (US) in combination with chemical disinfectants is an efficient and cost-effective hurdle technology for disinfecting minimally processed produce (MPP). However, the demand for non-chemical disinfection methods is increasing. In addition, chemical methods have been ineffective in simultaneously improving the physiological properties and inactivating pathogens in MPP. In this study, a novel and safe method called mild heat ascorbic acid (MHAsA; 1 % AsA at 50 °C) was combined with US to process minimally processed carrots. Physiological properties and microbial inactivation efficacy were analyzed during the storage period (0-5 days). The findings indicated that US-MHAsA induced the highest levels of antioxidant enzymes (superoxide dismutase and catalase) activities and accelerated the glutathione-ascorbate cycle, resulting in lower reactive oxygen species (ROS) and malondialdehyde content compared to US and MHAsA. The efficacy of US-MHAsA in inactivating phenylalanine lyase, the initial enzyme in the lignin synthesis process, was lower than that of US. On the other hand, its ability to inactivate cinnamyl alcohol dehydrogenase, the final enzyme in the process, was better than that of both US and MHAsA. However, there were no significant differences in lignin content among the three groups. The inactivation efficacy against enzymes (polyphenol oxidase and peroxidase) involved in browning was consistent across the three treatments. Analysis of the disinfection efficacy against Escherichia coli O157:H7 and Salmonella Typhimurium revealed that US-MHAsA achieved the lowest cross-contamination incidence (10-12 %) during washing, which was significantly lower than the incidence achieved by US (75-82 %). During the period from day 0 to day 5, two pathogens on carrots in the control group increased from 6.25 to 6.64 log CFU/g, while the lowest counts were observed in the US-MHAsA group, decreasing from 4.44 to 3.74 log CFU/g. However, the counts in the US group increased from 5.22 to 6.32 log CFU/g, and the counts at day 5 were not significantly lower than the control. These findings indicate that US-MHAsA is a novel hurdle technology that effectively reduces the risk of pathogen contamination and enhances the ability of MPP to scavenge ROS.
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Affiliation(s)
- Jiayi Wang
- National Demonstration Center for Experimental Biology Education, Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science & Technology, Xinjiang University, Urumqi 830046, China.
| | - Ning Zhou
- National Demonstration Center for Experimental Biology Education, Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science & Technology, Xinjiang University, Urumqi 830046, China
| | - Sen Ma
- National Demonstration Center for Experimental Biology Education, Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science & Technology, Xinjiang University, Urumqi 830046, China
| | - Xiaofei Yang
- College of Grain Science and Technology, Shenyang Normal University, Shenyang 110034, China
| | - Jun Xing
- National Demonstration Center for Experimental Biology Education, Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science & Technology, Xinjiang University, Urumqi 830046, China
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Peng S, Yao L, Zhu X, Ge W, Deng J, Li H, Xu D, Hu L, Mo H. Ultrasound combined with FeSO 4 facilitated the occurrence of ferroptosis in Vibrio parahaemolyticus. ULTRASONICS SONOCHEMISTRY 2024; 111:107080. [PMID: 39321597 PMCID: PMC11462476 DOI: 10.1016/j.ultsonch.2024.107080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2024] [Revised: 09/11/2024] [Accepted: 09/21/2024] [Indexed: 09/27/2024]
Abstract
Ultrasound (US) as a sustainable non-thermal sterilization technology that is employed either independently alone or in combination with other processing methods to eliminate food-borne pathogens in the food industry. In the present study, the synergistic effects of US combined with FeSO4 against Vibrio parahaemolyticus were investigated. The results demonstrated that the combination of ultrasound and FeSO4 had an excellent bactericidal activity on V. parahaemolyticus. Treatment with US (100 W) and FeSO4 (8 μM) for 15 min could kill more than 99.9 % cells. Furthermore, the observed cell death was identified as classical ferroptosis, characterized by ferroptosis hallmarks including iron-dependent, ROS burst, membrane damage and lipid peroxide accumulation. Addition of ferroptosis inhibitor liproxstatin-1 alleviated the cell death induced by the combination treatment. Transcriptome analysis further revealed that the US-FeSO4 treatment significantly influenced pathways related to fatty acid metabolism, ferroptosis, biofilm formation, RNA degradation, oxidative phosphorylation and other key processes, which likely contributed to the occurrence of ferroptosis. Based on these findings, we speculated that cavitation effect of US promoted the entry of Fe2+, leading to the generation of free radicals primarily responsible for ferroptosis by US-FeSO4. Taken together, this study provides valuable insights into the biological pathway involved in ultrasound sterilization and presents an alternative strategy to eradicate microorganism in food products.
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Affiliation(s)
- Shurui Peng
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Lishan Yao
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Xiaolin Zhu
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Wei Ge
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Jiakun Deng
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Hongbo Li
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Dan Xu
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Liangbin Hu
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
| | - Haizhen Mo
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
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Li Y, Liu S, Kuang H, Zhang J, Wang B, Wang S. Transcriptomic and Physiological Analysis Reveals the Possible Mechanism of Inhibiting Strawberry Aroma Changes by Ultrasound after Harvest. Foods 2024; 13:2231. [PMID: 39063314 PMCID: PMC11276260 DOI: 10.3390/foods13142231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Revised: 07/11/2024] [Accepted: 07/14/2024] [Indexed: 07/28/2024] Open
Abstract
The volatile compounds in strawberries play a significant role in the formation of strawberry aroma. However, these compounds undergo continual changes during storage, resulting in a decline in quality. In this study, a total of 67 volatile organic compounds (VOCs) were identified in strawberries through quantitative analysis. At the end of the storage period, the VOC content in the ultrasonic group was 119.02 µg/kg higher than that in the control group. The results demonstrated that the ultrasonic treatment increased the contents of terpenes and esters at the end of storage. Among these, linalool increased from 67.09 to 91.41 µg/kg, while ethyl cinnamate increased from 92.22 to 106.79 µg/kg. Additionally, the expression of the key metabolic genes closely related to these substances was significantly up-regulated. The expression of the FaNES gene, related to terpene metabolism, was up-regulated by 2.8 times in the second day, while the expression of the FaAAT gene, related to ester metabolism, was up-regulated by 1.5 times. In summary, this study provides a theoretical basis for exploring the mechanism of ultrasonic effect on strawberry flavor and quality after harvest.
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Affiliation(s)
| | | | | | | | | | - Shaojia Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health (BTBU), School of Food and Health, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, Beijing Technology and Business University, Beijing 100048, China; (Y.L.); (S.L.); (H.K.); (J.Z.); (B.W.)
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9
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Quan K, Qin Y, Chen K, Liu M, Zhang X, Liu P, van der Mei HC, Busscher HJ, Zhang Z. Lethal puncturing of planktonic Gram-positive and Gram-negative bacteria by magnetically-rotated silica hexapods. J Colloid Interface Sci 2024; 664:275-283. [PMID: 38471190 DOI: 10.1016/j.jcis.2024.03.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/30/2024] [Accepted: 03/03/2024] [Indexed: 03/14/2024]
Abstract
Planktonic bacterial presence in many industrial and environmental applications and personal health-care products is generally countered using antimicrobials. However, antimicrobial chemicals present an environmental threat, while emerging resistance reduces their efficacy. Suspended bacteria have no defense against mechanical attack. Therefore, we synthesized silica hexapods on an α-Fe2O3 core that can be magnetically-rotated to inflict lethal cell-wall-damage to planktonic Gram-negative and Gram-positive bacteria. Hexapods possessed 600 nm long nano-spikes, composed of SiO2, as shown by FTIR and XPS. Fluorescence staining revealed cell wall damage caused by rotating hexapods. This damage was accompanied by DNA/protein release and bacterial death that increased with increasing rotational frequency up to 500 rpm. Lethal puncturing was more extensive on Gram-negative bacteria than on Gram-positive bacteria, which have a thicker peptidoglycan layer with a higher Young's modulus. Simulations confirmed that cell-wall-puncturing occurs at lower nano-spike penetration levels in the cell walls of Gram-negative bacteria. This approach offers a new way to kill bacteria in suspension, not based on antimicrobial chemicals.
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Affiliation(s)
- Kecheng Quan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China; School of Materials Science and Engineering, Peking University, Beijing 100871, PR China
| | - Yu Qin
- School of Materials Science and Engineering, Peking University, Beijing 100871, PR China
| | - Kai Chen
- School of Materials Science and Engineering, Peking University, Beijing 100871, PR China
| | - Miaomiao Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
| | - Xiaoliang Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
| | - Peng Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
| | - Henny C van der Mei
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, 9713 AV Groningen, The Netherlands
| | - Henk J Busscher
- University of Groningen and University Medical Center Groningen, Department of Biomedical Engineering, 9713 AV Groningen, The Netherlands.
| | - Zexin Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
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