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Xu H, Guan Y, Shan C, Xiao W, Wu M. Development of thermoultrasound assisted blanching to improve enzyme inactivation efficiency, drying characteristics, energy consumption, and physiochemical properties of sweet potatoes. ULTRASONICS SONOCHEMISTRY 2023; 101:106670. [PMID: 37922719 PMCID: PMC10643530 DOI: 10.1016/j.ultsonch.2023.106670] [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: 05/01/2023] [Revised: 10/26/2023] [Accepted: 10/28/2023] [Indexed: 11/07/2023]
Abstract
Thermoultrasound (USB) as a promising alternative to traditional hot water (HWB) blanching was employed to blanch sweet potatoes and its influence on enzyme activity, drying behavior, energy consumption and physiochemical properties of sweet potatoes were investigated. Results showed that successive increases in blanching temperature and time resulted in significant (p < 0.05) decreases in PPO and POD activities. Compared to HWB, USB led to more effective drying by promoting texture softening, moisture diffusion, microstructure alterations, and microchannels formation, which significantly reduced energy consumption and improved the overall quality of the dried sample. Specifically, USB at 65 °C for 15 min improved water holding capacity and ABTS, while USB at 65 °C for 30 min improved color (more red and yellow), total phenolic content, total carotenoid content, and DPPH. Unfortunately, blanching process showed detrimental effects on the amino acid composition of dried samples. Overall, the development of thermoultrasound assisted blanching for sweet potatoes has the potential to revolutionize the processing and production of high-quality sweet potato products, while also improving the sustainability of food processing operations.
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Affiliation(s)
- Huihuang Xu
- College of Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, China
| | - Yaru Guan
- College of Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, China
| | - Chun Shan
- College of Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, China
| | - Wanru Xiao
- College of Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, China
| | - Min Wu
- College of Engineering, China Agricultural University, No. 17 Qinghua East Road, Haidian District, Beijing 100083, China.
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Pei L, Liu W, Jiang L, Xu H, Liu L, Wang X, Liu M, Abudureheman B, Zhang H, Chen J. Effect of high hydrostatic pressure on aroma volatile compounds and aroma precursors of Hami melon juice. Front Nutr 2023; 10:1285590. [PMID: 38024363 PMCID: PMC10667450 DOI: 10.3389/fnut.2023.1285590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 10/30/2023] [Indexed: 12/01/2023] Open
Abstract
High hydrostatic pressure (HHP) treatment is an effective technique for processing heat-sensitive fruits and causes changes in volatile compounds and their precursors while maintaining quality. We investigated the changes and correlations of volatile compounds, related enzyme activities and precursor amino acids, and fatty acids in Hami melon juice under 350-500 MPa pressure. The application of HHP treatment resulted in a considerable reduction of esters and a substantial increase in aldehydes and alcohols in C6 and C9. Activities of lipoxygenase (LOX), alcohol acyltransferase (AAT), and phospholipase A2 (PLA2) were lower than those of the untreated group, alcohol dehydrogenase (ADH) activity was reversed. When compared to fresh cantaloupe juice, there was an increase in both the types and contents of amino acids with lower total fatty acid contents than the control group. Positive correlations were observed among six ester-related substances and eight alcohol-related substances. Additionally, the correlations between volatile compounds and fatty acids were more substantial compared to those between volatile compounds and amino acids. HHP treatment increases Hami melon flavor precursors and is an effective way to maintain the aroma volatile compounds and flavor of Hami melon juice.
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Affiliation(s)
- Longying Pei
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Wei Liu
- College of Food Science and Engineering, Tarim University, Alar, Xinjiang Province, China
| | - Luxi Jiang
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Heng Xu
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Luping Liu
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Xiaoyu Wang
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Manli Liu
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Buhailiqiemu Abudureheman
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Heng Zhang
- College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, Xinjiang Province, China
| | - Jiluan Chen
- School of Food Science and Technology, Shihezi University, Shihezi, Xinjiang Province, China
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3
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Hong C, Zhao YM, Zhou C, Guo Y, Ma H. Ultrasonic washing as an abiotic elicitor to increase the phenolic content in fruits and vegetables: A review. Compr Rev Food Sci Food Saf 2023; 22:785-808. [PMID: 36541199 DOI: 10.1111/1541-4337.13091] [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: 07/07/2022] [Revised: 10/25/2022] [Accepted: 11/21/2022] [Indexed: 12/24/2022]
Abstract
Ultrasonic washing has been widely applied to the postharvest storage of fruits and vegetables as a residue-free physical washing technology, which plays an important role in improving shelf-life, safety, and nutritional value. Phenolics are a large group of phytochemicals widespread in fruits and vegetables, and they have been considered potential protective factors against some diseases because of potent antioxidative properties. Previous studies have shown that ultrasonic washing can increase the phenolic content of fruits and vegetables immediately or during storage through the induction of plant stress responses, which is of great significance for improving the functional and nutritional value of fruits and vegetables. However, the mechanisms of ultrasound as an elicitor to improve the phenolic content remain controversial. Therefore, this review summarizes the applications of ultrasonic washing to increase the phenolic content in fruits and vegetables. Meanwhile, the corresponding physiological stress response mechanisms of the phenolic accumulation in terms of immediate stress responses (i.e., higher extractability of phenolics) and late stress responses (i.e., metabolism of phenolics) are expounded. Moreover, a hypothetical model is proposed to explain phenolic biosynthesis triggered by signaling molecules produced under ultrasound stress, including primary signal (i.e., extracellular adenosine triphosphate) and secondary signals (e.g., reactive oxygen species, Ca2+ , NO, jasmonates, and ethylene). Additionally, the techno-economic feasibility of ultrasonic washing technology is also discussed. Further, challenges and trends for further development of ultrasonic washing as an abiotic elicitor applied to the postharvest storage of fruits and vegetables are presented.
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Affiliation(s)
- Chen Hong
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
- Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Yi-Ming Zhao
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
- Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Cunshan Zhou
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
- Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Yiting Guo
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
- Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Haile Ma
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
- Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, China
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Aslam R, Alam MS, Kaur J, Panayampadan AS, Dar OI, Kothakota A, Pandiselvam R. Understanding the effects of ultrasound processng on texture and rheological properties of food. J Texture Stud 2022; 53:775-799. [PMID: 34747028 DOI: 10.1111/jtxs.12644] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 12/30/2022]
Abstract
The demand for the production of high quality and safe food products has been ever increasing. Consequently, the industry is looking for novel technologies in food processing operations that are cost-effective, rapid and have a better efficiency over traditional methods. Ultrasound is well-known technology to enhance the rate of heat and mass transfer providing a high end-product quality, at just a fraction of time and energy normally required for conventional methods. The irradiation of foods with ultrasound creates acoustic cavitation that has been used to cause desirable changes in the treated products. The technology is being successfully used in various unit operations such as sterilization, pasteurization, extraction, drying, emulsification, degassing, enhancing oxidation, thawing, freezing and crystallization, brining, pickling, foaming and rehydration, and so forth. However, the high pressure and temperature associated with the cavitation process is expected to induce some changes in the textural and rheological properties of foods which form an important aspect of product quality in terms of consumer acceptability. The present review is aimed to focus on the effects of ultrasound processing on the textural and rheological properties of food products and how these properties are influenced by the process variables.
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Affiliation(s)
- Raouf Aslam
- Department of Processing and Food Engineering, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Mohammed Shafiq Alam
- Department of Processing and Food Engineering, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Jaspreet Kaur
- Department of Processing and Food Engineering, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Afthab Saeed Panayampadan
- Department of Processing and Food Engineering, Punjab Agricultural University, Ludhiana, Punjab, India
| | - Owias Iqbal Dar
- Aquatic Toxicology Lab, Department of Zoology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Anjineyulu Kothakota
- Agro-Processing and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, Kerala, India
| | - Ravi Pandiselvam
- Physiology, Biochemistry and Post-Harvest Technology Division, ICAR-Central Plantation Crops Research Institute, Kasaragod, Kerala, India
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Guo Y, Wu B, Guo X, Liu D, Qiu C, Ma H. Thermosonication inactivation of horseradish peroxidase with different frequency modes: Effect on activity, structure, morphology and mechanisms. Food Chem 2022; 384:132537. [DOI: 10.1016/j.foodchem.2022.132537] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 01/06/2022] [Accepted: 02/20/2022] [Indexed: 01/11/2023]
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Wu J, Chen H, Chen W, Zhong Q, Zhang M, Chen W. Effect of ultrasonic treatment on the activity of sugar metabolism relative enzymes and quality of coconut water. ULTRASONICS SONOCHEMISTRY 2021; 79:105780. [PMID: 34628309 PMCID: PMC8501503 DOI: 10.1016/j.ultsonch.2021.105780] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/14/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
In this study, tender coconuts were treated with high-intensity ultrasound (US) for 20 min at a frequency of 20 kHz and a power of 2400 W. Compared with control group, US treated coconut water had a higher content of total soluble solid and sugar/acid ratio along with a lower pH value and conductivity, and the contents of sucrose, fructose and glucose were also higher. Results from HS-SPME/GC-MS showed that there was no significant difference in the content of volatile compounds in coconut water before and after US treatment. The activities of sugar metabolism enzymes such as sucrose phosphate synthase, sucrose synthase, acid invertase (AI) and neutral invertase were inhibited by US, of which AI had the strongest inactivation. Circular dichroism and fluorescence spectra showed that the secondary and tertiary structure of AI molecule were destroyed with the increase of US intensity and time, which was confirmed by the change of particle size distribution pattern and scanning electron microscopy. Molecular docking and molecular dynamics showed that US treatment prevented the recognition and binding of sucrose and AI molecules, thereby inhibiting the decomposition of sucrose. In conclusion, our results indicate that US can inhibit the activity of AI and maintain the sugar content to increase the quality as well as extend the shelflife of coconut water, which will bring more commercial value.
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Affiliation(s)
- Jilin Wu
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China
| | - Haiming Chen
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China; Maritime Academy, Hainan Vocational University of Science and Technology, 18 Qingshan Road, Haikou, Hainan 571126, PR China
| | - Wenxue Chen
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China
| | - Qiuping Zhong
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China
| | - Ming Zhang
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China.
| | - Weijun Chen
- College of Food Science and Engineering, Hainan University, 58 Renmin Road, Haikou, Hainan 570228, PR China.
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7
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Nonthermal Processing Technologies for Stabilization and Enhancement of Bioactive Compounds in Foods. FOOD ENGINEERING REVIEWS 2021. [DOI: 10.1007/s12393-021-09295-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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8
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Effects of Pulsed Electric Fields and Ultrasound Processing on Proteins and Enzymes: A Review. Processes (Basel) 2021. [DOI: 10.3390/pr9040722] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
There is increasing demand among consumers for food products free of chemical preservatives, minimally processed and have fresh-like natural flavors. To meet these growing demands, the industries and researchers are finding alternative processing methods, which involve nonthermal methods to obtain a quality product that meets the consumer demands and adheres to the food safety protocols. In the past two decades’ various research groups have developed a wide range of nonthermal processing methods, of which few have shown potential in replacing the traditional thermal processing systems. Among all the methods, ultrasonication (US) and pulsed electric field (PEF) seem to be the most effective in attaining desirable food products. Several researchers have shown that these methods significantly affect various major and minor nutritional components present in food, including proteins and enzymes. In this review, we are going to discuss the effect of nonthermal methods on proteins, including enzymes. This review comprises results from the latest studies conducted from all over the world, which would help the research community and industry investigate the future pathway for nonthermal processing methods, especially in preserving the nutritional safety and integrity of the food.
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9
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Thermosonication for the Production of Sulforaphane Rich Broccoli Ingredients. Biomolecules 2021; 11:biom11020321. [PMID: 33672547 PMCID: PMC7923798 DOI: 10.3390/biom11020321] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 12/22/2022] Open
Abstract
A large proportion of broccoli biomass is lost during primary production, distribution, processing, and consumption. This biomass is rich in polyphenols and glucosinolates and can be used for the production of bioactive rich ingredients for food and nutraceutical applications. This study evaluated thermosonication (TS) (18 kHz, 0.6 W/g, 40–60 °C, 3–7 min) for the pre-treatment of broccoli florets to enhance enzymatic conversion of glucoraphanin into the bioactive sulforaphane. TS significantly increased sulforaphane yield, despite a decrease in myrosinase activity with increasing treatment intensity. The highest sulforaphane yield of ~2.9 times that of untreated broccoli was observed for broccoli thermosonicated for 7 min at 60 °C, which was 15.8% higher than the corresponding yield for thermal processing without sonication (TP) at the same condition. This was accompanied by increase in the residual level of glucoraphanin (~1.8 and 2.3 time respectively after TP and TS at 60 °C for 7 min compared to control samples) indicating that treatment-induced release of bound glucoraphanin from the cell wall matrix and improved accessibility could be at least partially responsible for the enhanced sulforaphane yield. The result indicates the potential of TS for the conversion of broccoli biomass into high sulforaphane broccoli-based ingredients.
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Ma X, Cai J, Liu D. Ultrasound for pectinase modification: an investigation into potential mechanisms. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:4636-4642. [PMID: 32386236 DOI: 10.1002/jsfa.10472] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 04/14/2020] [Accepted: 05/09/2020] [Indexed: 05/24/2023]
Abstract
BACKGROUND Today, ultrasound is increasingly utilized in enzyme modification. Strongly dependent on the specific operational conditions, the modification effect brought by ultrasound can be activation and inactivation of enzymes. This work aims to study the ultrasound mechanisms under different conditions, to investigate the respective roles of free radical effect and mechanical effect in pectinase activation and inactivation, and to reveal the influence of pectinase concentration on the ultrasound-modification effect. RESULTS When ultrasound was introduced to a liquid system, generation of free radicals was positively correlated with ultrasound intensity and treatment duration, but negatively correlated with temperature. Thiourea with a concentration of 4 mmol L-1 was selected as a free radical scavenger to effectively shield ultrasound free radicals. The highest enzyme activity of pectinase solutions at 0.1, 1.0, and 10.0 mg mL-1 was obtained at the same ultrasound intensity of 4.50 W mL-1 and time of 15 min, where the enzyme activity was increased by 68.24%, 20.98% and 18.83%, respectively. Furthermore, the addition of thiourea enhanced the enzyme activity at each tested ultrasound intensity and time, especially those exceeding the best conditions; it also eliminated the redshift phenomenon that was previously presented in the fluorescence spectra of pectinase samples. CONCLUSION Pectinase concentrations did not change the optimum ultrasound conditions for enzyme modification, but pectinase with a low concentration was more vulnerable to ultrasound treatment. During modification, ultrasound mechanical effects dominated in the pectinase activation, while free radical effects dominated in the inactivation process. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Xiaobin Ma
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, Hangzhou, China
| | - Jingwen Cai
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Donghong Liu
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R & D Center for Food Technology and Equipment, Zhejiang University, Hangzhou, China
- Fuli Institute of Food Science, Zhejiang University, Hangzhou, China
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11
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Effect of ultrasound and microwave processing on the structure, in-vitro digestibility and trypsin inhibitor activity of soymilk proteins. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109708] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Kehinde BA, Sharma P, Kaur S. Recent nano-, micro- and macrotechnological applications of ultrasonication in food-based systems. Crit Rev Food Sci Nutr 2020; 61:599-621. [PMID: 32208850 DOI: 10.1080/10408398.2020.1740646] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
There is a neoteric and rising demand for nutritional and functional foods which behooves food processors to adopt processing techniques with optimal conservation of bioactive components in foods and with minimal pernicious impacts on the environment. Ultrasonication, a mechanochemical technique has proven to be an efficacious panacea to these concerns. In this review, an analytic exploration of recent researches and designs regarding ultrasound methodology and equipment on diverse food systems, technological scales, procedural parameters and outcomes of such experimentations optimally scrutinized. The relative effects of ultrasonication on food formulations, components and attributes such as nanoemulsions, nanocapsules, proteins, micronutrients, sensory and mechanical characteristics are evaluatively delineated. In food systems where ultrasonication was employed, it was found to have a remarkable effect on one or more quality parameters. This review is a supplementation to the pedagogical awareness to scholars on the suitability of ultrasonication for research procedures, and a call to industrial food brands on the adoption of this technique for the development of foods with optimally sustained nutrient profiles.
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Affiliation(s)
- Bababode Adesegun Kehinde
- Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, Kentucky, USA
| | - Poorva Sharma
- Department of Food Technology and Nutrition, School of Agriculture, Lovely Professional University, Phagwara, Punjab, India
| | - Sawinder Kaur
- Department of Food Technology and Nutrition, School of Agriculture, Lovely Professional University, Phagwara, Punjab, India
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Lan W, Chen S. Chemical kinetics, thermodynamics and inactivation kinetics of dextransucrase activity by ultrasound treatment. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01728-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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14
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Zhou L, Liao T, Liu W, Zou L, Liu C, Terefe NS. Inhibitory effects of organic acids on polyphenol oxidase: From model systems to food systems. Crit Rev Food Sci Nutr 2019; 60:3594-3621. [PMID: 31858810 DOI: 10.1080/10408398.2019.1702500] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Organic acids are widely utilized in the food industry for inhibiting the activity of polyphenol oxidase (PPO) and enzymatic browning. This review discusses the mechanisms of inhibition of PPO and enzymatic browning by various organic acids based on studies in model systems, critically evaluates the relevance of such studies to real food systems and assesses the implication of the synergistic inhibitory effects of organic acids with other physicochemical processing techniques on product quality and safety. Organic acids inhibit the activity of PPO and enzymatic browning via different mechanisms and therefore the suitability of a particular organic acid depends on the structure and the catalytic properties of PPO and the physicochemical properties of the food matrix. Studies in model systems provide an invaluable insight into the inhibitory mechanisms of various organics acids. However, the difference in the effectiveness of PPO inhibitors between model systems and food systems and the lack of correlation between the degree of PPO inhibition based on in vitro assays and enzymatic browning imply that the effectiveness of organic acids can be accurately evaluated only via direct assessment of browning inhibition in a particular food system. Combination of organic acids with physical processing techniques is one of the most viable approaches for PPO inhibition since the observed synergistic effect helps to reduce the undesirable organoleptic quality changes from the use of excessive concentration of organic acids or intense physical processing.
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Affiliation(s)
- Lei Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China.,School of Life Sciences, Nanchang University, Nanchang, China
| | - Tao Liao
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Wei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Liqiang Zou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Chengmei Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
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15
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Ultrasound Processing Alone or in Combination with Other Chemical or Physical Treatments as a Safety and Quality Preservation Strategy of Fresh and Processed Fruits and Vegetables: A Review. FOOD BIOPROCESS TECH 2019. [DOI: 10.1007/s11947-019-02313-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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16
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Taticchi A, Selvaggini R, Esposto S, Sordini B, Veneziani G, Servili M. Physicochemical characterization of virgin olive oil obtained using an ultrasound-assisted extraction at an industrial scale: Influence of olive maturity index and malaxation time. Food Chem 2019; 289:7-15. [PMID: 30955668 DOI: 10.1016/j.foodchem.2019.03.041] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 03/07/2019] [Accepted: 03/09/2019] [Indexed: 11/16/2022]
Abstract
Ultrasound-assisted extraction is an innovative technique applied to the extraction process for virgin olive oil (VOO), which is generally employed to increase plant efficiency and improve product quality. A high-power ultrasound (US) device was introduced at an industrial plant that can process at 2 tons/h to evaluate the technique's physicochemical impact on quality parameters of VOO that was caused by an intensive mass transfer induced by acoustic cavitation process and shockwaves. The impact on oil yield was also evaluated with respect to the ripening stage and malaxation time. No significant effects on the legal and commercial parameters of VOO (including quality indices, sterols, triterpene dialcohols, waxes and diacylglycerols) were found for olives at medium-early ripening stage. Significant physical changes, increased extraction yield (22.7%), enhanced phenol content (10.1%) were observed in US-VOO compared to control (C) oil extracted with a traditional process at an early maturity index.
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Affiliation(s)
- Agnese Taticchi
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy
| | - Roberto Selvaggini
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy
| | - Sonia Esposto
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy
| | - Beatrice Sordini
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy
| | - Gianluca Veneziani
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy.
| | - Maurizio Servili
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Via S. Costanzo, 06126 Perugia, Italy
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17
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Jayathunge KGLR, Stratakos AC, Delgado‐Pando G, Koidis A. Thermal and non‐thermal processing technologies on intrinsic and extrinsic quality factors of tomato products: A review. J FOOD PROCESS PRES 2019. [DOI: 10.1111/jfpp.13901] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- K. G. L. R. Jayathunge
- Institute for Global Food Security Queen’s University Belfast Belfast United Kingdom
- Department of Biosystems Technology University of Sri Jayewardenepura Nugegoda Sri Lanka
| | | | | | - Anastasios Koidis
- Institute for Global Food Security Queen’s University Belfast Belfast United Kingdom
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18
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Chen L, Bi X, Guo D, Xing Y, Che Z. The effect of high-power ultrasound on the quality of carrot juice. FOOD SCI TECHNOL INT 2019; 25:394-403. [PMID: 30696272 DOI: 10.1177/1082013219825736] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The effect of high-power ultrasound treatment on enzymes' activity, physicochemical attributes (total soluble solids, pH, viscosity, turbidity, particle size distribution and colour) and carotenoids' content of carrot juice was investigated. The treatments were carried out at 20 kHz (0.95, 2.38, 3.80 W/ml power) in an ice bath for 2, 4, 6, 8, 10 min. The polyphenol oxidase and pectin methylesterase activity were decreased by 43.90 and 37.95% at 3.80 W/ml power and 10 min exposure time, respectively. With the increase of power and time, the effect of high-power ultrasound on the inactivation of enzymes was getting stronger. However, high-power ultrasound had no inactivation effect on peroxidase activity under all treatment conditions. The visual colour differences were not obvious after high-power ultrasound. The pH, total soluble solids and particle size distribution of carrot juice were not significantly affected (p > 0.05) under all treatment conditions, while turbidity was increased and carotenoids' content was decreased. The viscosity of carrot juice was decreased by 1.27% at 0.95 W/ml power and 8 min, while it was increased by 2.29% at 2.38 W/ml power and 8 min. The value of viscosity was negatively correlated with the activity of pectin methylesterase (Pearson's r = -0.481, p < 0.05). According to these results, we could conclude that the optimal treatment condition was 3.80 W/ml for 10 min. Overall, high-power ultrasound treatment inhibited browning, maintained taste and nutritional value and improved stability of carrot juice. Therefore, this technology could well be an option for processing of carrot juice and laid the theoretical foundation for the production of carrot juice and carrot compound beverage.
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Affiliation(s)
- Liyi Chen
- School of Food and Bioengineering, Sichuan Key Laboratory of Food Bio-technology, Xihua University, Chengdu, People's Republic of China
| | - Xiufang Bi
- School of Food and Bioengineering, Sichuan Key Laboratory of Food Bio-technology, Xihua University, Chengdu, People's Republic of China
| | - Dandan Guo
- School of Food and Bioengineering, Sichuan Key Laboratory of Food Bio-technology, Xihua University, Chengdu, People's Republic of China
| | - Yage Xing
- School of Food and Bioengineering, Sichuan Key Laboratory of Food Bio-technology, Xihua University, Chengdu, People's Republic of China
| | - Zhenming Che
- School of Food and Bioengineering, Sichuan Key Laboratory of Food Bio-technology, Xihua University, Chengdu, People's Republic of China
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Zhao CC, Eun JB. Influence of ultrasound application and NaCl concentrations on brining kinetics and textural properties of Chinese cabbage. ULTRASONICS SONOCHEMISTRY 2018; 49:137-144. [PMID: 30078495 DOI: 10.1016/j.ultsonch.2018.07.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 07/09/2018] [Accepted: 07/27/2018] [Indexed: 06/08/2023]
Abstract
The effects of ultrasound application on the brining kinetics of Chinese cabbage leaves was evaluated at different NaCl concentrations (10, 15, and 20%) of the brine, and its influence on textural properties and salt distribution was also investigated. To identify the effects of these two factors on water and NaCl fluxes, the kinetics of transport was analyzed by taking the diffusion theory into account. The results showed that NaCl concentration and ultrasound application significantly affected moisture and NaCl transport. Based on Fick's equation, the NaCl effective diffusivities were enhanced upon ultrasound application during the brining process, increasing from 147.09 to 812.22%. With regard to the textural properties, a higher content of NaCl resulted in lower textural profile values. Moreover, ultrasound application significantly increased the cabbage hardness. Scanning electron microscopy and energy dispersive X-ray mapping images showed the intensification of NaCl transport brought about by ultrasound application and by the increase in NaCl content, which confirms the results of the modeling analysis. Therefore, ultrasound could be a potential technology for accelerating the brining process of cabbage. These results have direct implications for the quality management of kimchi products.
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Affiliation(s)
- Chang-Cheng Zhao
- Department of Food Science and Technology and BK 21 Plus Program, Graduate School of Chonnam National University, Gwangju 61186, South Korea
| | - Jong-Bang Eun
- Department of Food Science and Technology and BK 21 Plus Program, Graduate School of Chonnam National University, Gwangju 61186, South Korea.
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Tsikrika K, Chu BS, Bremner DH, Lemos MA. The effect of different frequencies of ultrasound on the activity of horseradish peroxidase. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2017.11.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Study on high pressure homogenization and high power ultrasound effectiveness in inhibiting polyphenoloxidase activity in apple juice. J FOOD ENG 2018. [DOI: 10.1016/j.jfoodeng.2017.10.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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23
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Poojary MM, Dellarosa N, Roohinejad S, Koubaa M, Tylewicz U, Gómez-Galindo F, Saraiva JA, Rosa MD, Barba FJ. Influence of Innovative Processing on γ-Aminobutyric Acid (GABA) Contents in Plant Food Materials. Compr Rev Food Sci Food Saf 2017; 16:895-905. [DOI: 10.1111/1541-4337.12285] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 06/12/2017] [Accepted: 06/14/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Mahesha M. Poojary
- Dept. of Food Science; Univ. of Copenhagen; Rolighedsvej 26 1958 Frederiksberg C Denmark
- with Discipline of Laboratory Medicine, School of Health and Biomedical Sciences; RMIT Univ.; 3083 Bundoora Australia
- also with Chemistry Section, School of Science and Technology; Univ. of Camerino; via S. Agostino 1 62032 Camerino Italy
| | - Nicolò Dellarosa
- Dept. of Agricultural and Food Sciences; Univ. of Bologna; Cesena Italy
| | - Shahin Roohinejad
- Dept. of Food Technology and Bioprocess Engineering, Max Rubner-Institut; Federal Research Inst. of Nutrition and Food; Haid-und-Neu-Straße 9 76131 Karlsruhe Germany
- with Burn and Wound Healing Research Center, Div. of Food and Nutrition; Shiraz Univ. of Medical Sciences; Shiraz Iran
| | - Mohamed Koubaa
- Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu; Univ. de Technologie de Compiègne; CS 60319 60203 Compiègne Cedex France
| | - Urszula Tylewicz
- Dept. of Agricultural and Food Sciences; Univ. of Bologna; Cesena Italy
| | - Federico Gómez-Galindo
- Food Technology, Engineering and Nutrition; Lund Univ.; Naturvetarvägen 14 SE- 22362 Lund Sweden
| | - Jorge A. Saraiva
- QOPNA, Chemistry Dept.; Univ. of Aveiro; Campus Universitário de Santiago 3810-193 Aveiro Portugal
| | - Marco Dalla Rosa
- Dept. of Agricultural and Food Sciences; Univ. of Bologna; Cesena Italy
- Interdepartmental Centre for Agri-Food Industrial Research; Univ. of Bologna; Cesena Italy
| | - Francisco J. Barba
- Nutrition and Food Science Area, Preventive Medicine and Public Health, Food Sciences, Toxicology and Forensic Medicine Dept., Faculty of Pharmacy; Univ. de València; Avda. Vicent Andrés Estellés, s/n 46100 Burjassot València Spain
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Leong T, Juliano P, Knoerzer K. Advances in Ultrasonic and Megasonic Processing of Foods. FOOD ENGINEERING REVIEWS 2017. [DOI: 10.1007/s12393-017-9167-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Baltacıoğlu H, Bayındırlı A, Severcan F. Secondary structure and conformational change of mushroom polyphenol oxidase during thermosonication treatment by using FTIR spectroscopy. Food Chem 2017; 214:507-514. [DOI: 10.1016/j.foodchem.2016.07.021] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 05/10/2016] [Accepted: 07/05/2016] [Indexed: 01/23/2023]
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26
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Sulaiman A, Farid M, Silva FV. Quality stability and sensory attributes of apple juice processed by thermosonication, pulsed electric field and thermal processing. FOOD SCI TECHNOL INT 2016; 23:265-276. [PMID: 28359205 DOI: 10.1177/1082013216685484] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Worldwide, apple juice is the second most popular juice, after orange juice. It is susceptible to enzymatic browning spoilage by polyphenoloxidase, an endogenous enzyme. In this study, Royal Gala apple juice was treated by thermosonication (TS: 1.3 W/mL, 58 ℃, 10 min), pulsed electric field (PEF: 24.8 kV/cm, 60 pulses, 169 µs treatment time, 53.8 ℃) and heat (75 ℃, 20 min) and stored at 3.0 ℃ and 20.0 ℃ for 30 days. A sensory analysis was carried out after processing. The polyphenoloxidase activity, antioxidant activity and total color difference of the apple juice were determined before and after processing and during storage. The sensory analysis revealed that thermosonication and pulsed electric field juices tasted differently from the thermally treated juice. Apart from the pulsed electric field apple juice stored at room temperature, the processed juice was stable during storage, since the pH and soluble solids remained constant and fermentation was not observed. Polyphenoloxidase did not reactivate during storage. Along storage, the juices' antioxidant activity decreased and total color difference increased (up to 6.8). While the antioxidant activity increased from 86 to 103% with thermosonication and was retained after pulsed electric field, thermal processing reduced it to 67%. The processing increased the total color difference slightly. No differences in the total color difference of the juices processed by the three methods were registered after storage. Thermosonication and pulsed electric field could possibly be a better alternative to thermal preservation of apple juice, but refrigerated storage is recommended for pulsed electric field apple juice.
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Affiliation(s)
- Alifdalino Sulaiman
- 1 Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand.,2 Department of Process and Food Engineering, Universiti Putra Malaysia, Selangor, Malaysia
| | - Mohammed Farid
- 1 Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand
| | - Filipa Vm Silva
- 1 Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand
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27
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Sulaiman A, Farid M, Silva FVM. Strawberry puree processed by thermal, high pressure, or power ultrasound: Process energy requirements and quality modeling during storage. FOOD SCI TECHNOL INT 2016; 23:293-309. [DOI: 10.1177/1082013216685485] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Strawberry puree was processed for 15 min using thermal (65 ℃), high-pressure processing (600 MPa, 48 ℃), and ultrasound (24 kHz, 1.3 W/g, 33 ℃). These conditions were selected based on similar polyphenoloxidase inactivation (11%–18%). The specific energies required for the above-mentioned thermal, high-pressure processing, and power ultrasound processes were 240, 291, and 1233 kJ/kg, respectively. Then, the processed strawberry was stored at 3 ℃ and room temperature for 30 days. The constant pH (3.38±0.03) and soluble solids content (9.03 ± 0.25°Brix) during storage indicated a microbiological stability. Polyphenoloxidase did not reactivate during storage. The high-pressure processing and ultrasound treatments retained the antioxidant activity (70%–74%) better than the thermal process (60%), and high-pressure processing was the best treatment after 30 days of ambient storage to preserve antioxidant activity. Puree treated with ultrasound presented more color retention after processing and after ambient storage than the other preservation methods. For the three treatments, the changes of antioxidant activity and total color difference during storage were described by the fractional conversion model with rate constants k ranging between 0.03–0.09 and 0.06–0.22 day − 1, respectively. In resume, high-pressure processing and thermal processes required much less energy than ultrasound for the same polyphenoloxidase inactivation in strawberry. While high-pressure processing retained better the antioxidant activity of the strawberry puree during storage, the ultrasound treatment was better in terms of color retention.
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Affiliation(s)
- Alifdalino Sulaiman
- Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand
- Department of Food and Process Engineering, Universiti Putra Malaysia, Selangor, Malaysia
| | - Mohammed Farid
- Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand
| | - Filipa VM Silva
- Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand
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28
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Bonavita A, Carratore V, Ciardiello MA, Giovane A, Servillo L, D'Avino R. Influence of pH on the Structure and Function of Kiwi Pectin Methylesterase Inhibitor. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:5866-76. [PMID: 27335009 DOI: 10.1021/acs.jafc.6b01718] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Pectin methylesterase is a pectin modifying enzyme that plays a key role in plant physiology. It is also an important quality-related enzyme in plant-based food products. The pectin methylesterase inhibitor (PMEI) from kiwifruit inhibits this enzyme activity and is widely used as an efficient tool for research purposes and also recommended in the context of fruit and vegetable processing. Using several methodologies of protein biochemistry, including circular dichroism and fluorescence spectroscopy, chemical modifications, direct protein-sequencing, enzyme activity, and bioinformatics analysis of the crystal structure, this study demonstrates that conformational changes occur in kiwi PMEI by the pH rising over 6.0 bringing about structure loosening, exposure, and cleavage of a natively buried disulfide bond, unfolding and aggregation, ultimately determining the loss of ability of kiwi PMEI to bind and inhibit PME. pH-induced structural changes are prevented when PMEI is already engaged in complex or is in a solution of high ionic strength.
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Affiliation(s)
| | - Vitale Carratore
- Institute of Biosciences and BioResources, C.N.R. , Napoli, Italy
| | | | - Alfonso Giovane
- Department of Biochemistry, Biophysics and General Pathology, Second University of Napoli , Napoli, Italy
| | - Luigi Servillo
- Department of Biochemistry, Biophysics and General Pathology, Second University of Napoli , Napoli, Italy
| | - Rossana D'Avino
- Institute of Biosciences and BioResources, C.N.R. , Napoli, Italy
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29
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Sulaiman A, Soo MJ, Farid M, Silva FV. Thermosonication for polyphenoloxidase inactivation in fruits: Modeling the ultrasound and thermal kinetics in pear, apple and strawberry purees at different temperatures. J FOOD ENG 2015. [DOI: 10.1016/j.jfoodeng.2015.06.020] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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30
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Chakraborty S, Kaushik N, Rao PS, Mishra HN. High-Pressure Inactivation of Enzymes: A Review on Its Recent Applications on Fruit Purees and Juices. Compr Rev Food Sci Food Saf 2014; 13:578-596. [PMID: 33412700 DOI: 10.1111/1541-4337.12071] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2014] [Accepted: 03/10/2014] [Indexed: 11/29/2022]
Abstract
In the last 2 decades high-pressure processing (HPP) has established itself as one of the most suitable nonthermal technologies applied to fruit products for the extension of shelf-life. Several oxidative and pectic enzymes are responsible for deterioration in color, flavor, and texture in fruit purees and juices (FP&J). The effect of HPP on the activities of polyphenoloxidase, peroxidase, β-glucosidase, pectinmethylesterase, polygalacturonase, lipoxygenase, amylase, and hydroperoxide lyase specific to FP&J have been studied by several researchers. In most of the cases, partial inactivation of the target enzymes was possible under the experimental domain, although their pressure sensitivity largely depended on the origin and their microenvironmental condition. The variable sensitivity of different enzymes also reflects on their kinetics. Several empirical models have been established to describe the kinetics of an enzyme specific to a FP&J. The scientific literature in the last decade illustrating the effects of HPP on enzymes in FP&J, enzymatic action on those products, mechanism of enzyme inactivation during high pressure, their inactivation kinetics, and several intrinsic and extrinsic factors influencing the efficacy of HPP is critically reviewed in this article. In addition, process optimization of HPP targeting specific enzymes is of great interest from an industrial approach. This review will give a fair idea about the target enzymes specific to FP&J and the optimum conditions needed to achieve sufficient inactivation during HPP treatment.
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Affiliation(s)
- Snehasis Chakraborty
- Agricultural and Food Engineering Dept, Indian Inst. of Technology, Kharagpur, 721302, India
| | - Neelima Kaushik
- Agricultural and Food Engineering Dept, Indian Inst. of Technology, Kharagpur, 721302, India
| | - P Srinivasa Rao
- Agricultural and Food Engineering Dept, Indian Inst. of Technology, Kharagpur, 721302, India
| | - H N Mishra
- Agricultural and Food Engineering Dept, Indian Inst. of Technology, Kharagpur, 721302, India
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Terefe NS, Sheean P, Fernando S, Versteeg C. The stability of almond β-glucosidase during combined high pressure-thermal processing: a kinetic study. Appl Microbiol Biotechnol 2012; 97:2917-28. [PMID: 22644526 DOI: 10.1007/s00253-012-4162-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Revised: 05/08/2012] [Accepted: 05/10/2012] [Indexed: 01/02/2023]
Abstract
The thermal and the combined high pressure-thermal inactivation kinetics of almond β-glucosidase (β-D-glucoside glucohydrolase, EC 3.2.1.21) were investigated at pressures from 0.1 to 600 MPa and temperatures ranging from 30 to 80 °C. Thermal treatments at temperatures higher than 50 °C resulted in significant inactivation with complete inactivation after 2 min of treatment at 80 °C. Both the thermal and high pressure inactivation kinetics were described well by first-order model. Application of pressure increased the inactivation kinetics of the enzyme except at moderate temperatures (50 to 70 °C) and pressures between 0.1 and 100 MPa where slight pressure stabilisation of the enzyme against thermal denaturation was observed. The activation energy for the inactivation of the enzyme at atmospheric pressure was estimated to be 216.2±8.6 kJ/mol decreasing to 55.2±3.9 kJ/mol at 600 MPa. The activation volumes were negative at all temperature conditions excluding the temperature-pressure range where slight pressure stabilisation was observed. The values of the activation volumes were estimated to be -29.6±0.6, -29.8±1.7, -20.6±3.2, -41.2±4.8, -36.5±1.8, -39.6±4.3, -31.0±4.5 and -33.8±3.9 cm3/mol at 30, 35, 40, 45, 50, 60, 65 and 70 °C, respectively, with no clear trend with temperature. The pressure-temperature dependence of the inactivation rate constants was well described by an empirical third-order polynomial model.
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