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Duan Y, Yang X, Deng D, Zhang L, Ma X, He L, Zhu X, Zhang X. Effects of ultrasonic waves of different powers on the physicochemical properties, functional characteristics, and ultrastructure of bovine liver peptides. ULTRASONICS SONOCHEMISTRY 2024; 110:107031. [PMID: 39173448 PMCID: PMC11381874 DOI: 10.1016/j.ultsonch.2024.107031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 08/11/2024] [Accepted: 08/14/2024] [Indexed: 08/24/2024]
Abstract
In recent years, ultrasound has emerged as a widely used technology for modifying proteins/peptides. In this study, we focused on the intrinsic mechanism of ultrasound-induced modification of bovine liver peptides, which were treated with ultrasound power of 0, 100, 200, 300, 400, and 500 W, and their physicochemical and functional properties, as well as ultrastructures, were investigated. The results show that ultrasound mainly affects hydrogen bonding and hydrophobic interactions to change the conformation of proteins and unfolds proteins through a cavitation effect, leading to an increase in biological activity. Fourier infrared spectroscopy showed that ultrasound inhibited the formation of hydrogen bonds and reduced intermolecular cross-linking. Molecular weight distribution showed that the antioxidant components of bovine liver polypeptides were mainly concentrated in fractions of 500-1,000 Da. Maximum values of ABTS (82.66 %), DPPH (76.02 %), chelated iron (62.18 %), and reducing power (1.2447) were obtained by treating bovine liver polypeptides with 500 W ultrasound. Combined with the scanning electron microscopy results, with the intervention of ultrasound, the impact force generated by ultrasonication may lead to the loosening of the protein structure, which further promotes the release of antioxidant peptides, and these findings provide new insights into the application of ultrasound in the release of antioxidant peptides from bovine liver.
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Affiliation(s)
- Yufeng Duan
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
| | - Xue Yang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
| | - Dan Deng
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
| | - Li Zhang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China.
| | - Xiaotong Ma
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
| | - Long He
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
| | - Xiaopeng Zhu
- Gansu Wanhe Grass and Livestock Industry Technology Development Co., Ltd., Lanzhou 730070, China
| | - Xinjun Zhang
- Ningxia Xiahua Meat Food Co., Ltd., Zhongwei 75500, China
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2
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Hao Y, Xing L, Wang Z, Cai J, Toldrá F, Zhang W. Study on the anti-inflammatory activity of the porcine bone collagen peptides prepared by ultrasound-assisted enzymatic hydrolysis. ULTRASONICS SONOCHEMISTRY 2023; 101:106697. [PMID: 37984208 PMCID: PMC10696096 DOI: 10.1016/j.ultsonch.2023.106697] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/18/2023] [Accepted: 11/13/2023] [Indexed: 11/22/2023]
Abstract
In this study, the effects of ultrasound-assisted enzymatic hydrolysis on the extraction of anti-inflammatory peptides from porcine bone collagen were investigated. The results showed that ultrasound treatment increased the content of α-helix while decreased β-chain and random coil, promoted generation of small molecular peptides. Ultrasound-assisted enzymatic hydrolysis improved the peptide content, enhanced ABTS+ radical scavenging and ferrous ion chelating ability than non-ultrasound group. At the ultrasonic power of 450 W (20 min), peptides possessed significant anti-inflammatory activity, where the releasing of interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) was all suppressed in lipopolysaccharide (LPS) induced RAW264.7 cells. After the analysis with LC-MS/MS, eight peptides with potential anti-inflammatory activities were selected by the PeptideRanker and molecular docking. In general, the ultrasound-assisted enzymatic hydrolysis was an effective strategy to extract the bioactive peptides from porcine bone, and the inflammatory regulation capacity of bone collagen sourced peptides was firstly demonstrated.
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Affiliation(s)
- Yuejing Hao
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, MOE, Jiangsu Synergetic Innovation Center of Meat Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Lujuan Xing
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, MOE, Jiangsu Synergetic Innovation Center of Meat Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Zixu Wang
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, MOE, Jiangsu Synergetic Innovation Center of Meat Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Jiaming Cai
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, MOE, Jiangsu Synergetic Innovation Center of Meat Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Fidel Toldrá
- Instituto de Agroquímica y Tecnología de Alimentos (CSIC), Avenue Agustín Escardino 7, Paterna, Valencia 46980, Spain
| | - Wangang Zhang
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, MOE, Jiangsu Synergetic Innovation Center of Meat Processing and Quality Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
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Wang C, Su K, Sun W, Huang T, Lou Q, Zhan S. Comparative investigations of various modification methods on the gelling, rheological properties and mechanism of fish gelatin. Food Chem 2023; 426:136632. [PMID: 37336099 DOI: 10.1016/j.foodchem.2023.136632] [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: 03/03/2023] [Revised: 06/12/2023] [Accepted: 06/12/2023] [Indexed: 06/21/2023]
Abstract
In this study, κ-carrageenan(κC) and Transglutaminase (TG) were used to modify fish gelatin (FG). Three types of modified gelatin groups FG-κC, FG-TG and FG-κC-TG were prepared. The results showed that the gel strength and textural properties of FG gels were greatly enhanced by κC modification and κC-TG complex modification, whilst pure TG modification weakened the gelling properties. And the pure 0.1 % κC modified FG had the highest gel strength and hardness, respectively. Rheological behavior showed that the complex modified FG samples had the highest viscosity, gelling points, melting points and G'∞. Fourier infrared spectra and LF-NMR analysis showed that κC and κC-TG modification respectively improved the contents of hydrogen and isopeptide that decreased the water mobility but stabilized the helical structure of gelatin gels. Fluorescence intensity showed that three types of modification decreased fluorescence intensity. While, the formation of aggregates and denser gel networks decreased in vitro digestibility of FG.
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Affiliation(s)
- Chengcheng Wang
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China
| | - Kaiyuan Su
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China
| | - Wanyi Sun
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China
| | - Tao Huang
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China; Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo, China.
| | - Qiaoming Lou
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China; Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo, China
| | - Shengnan Zhan
- College of Food and Pharmaceutical Science, Ningbo University, Ningbo, Zhejiang, China; Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo, China.
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4
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Habinshuti I, Nsengumuremyi D, Muhoza B, Ebenezer F, Yinka Aregbe A, Antoine Ndisanze M. Recent and novel processing technologies coupled with enzymatic hydrolysis to enhance the production of antioxidant peptides from food proteins: A review. Food Chem 2023; 423:136313. [PMID: 37182498 DOI: 10.1016/j.foodchem.2023.136313] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 05/01/2023] [Accepted: 05/03/2023] [Indexed: 05/16/2023]
Abstract
Antioxidant peptides obtained through enzymatic hydrolysis of food proteins exhibit a broad range of bioactivities both in vitro and in vivo models. The antioxidant peptides showed the potential to fight against the reactive oxygen species, free radicals and other pro-oxidative substances which are considered the source of various chronic diseases for humans. Both animals and plants have been recognized as natural protein sources and attracted much research interest over the synthetic ones in terms of safety. However, the main challenge remains to increase the antioxidant peptides yield, reduce the enzyme quantity and the reaction time. Consequently, different efficient and innovative food processing technologies such as thermal, ultrasound, microwave, high hydrostatic pressure, pulsed electric field, etc. have been developed and currently used to treat food proteins before (pretreatment) or during the enzymatic hydrolysis (assisted). Those technologies were found to significantly enhance the degree of hydrolysis and the production of substantial antioxidant peptides. These emerging technologies enhance the enzymatic hydrolysis by inducing protein denaturation/unfolding, and the enzymatic activation without altering their functional and nutritional properties. This review discusses the state of the art of thermal, ultrasound, high hydrostatic pressure, microwave, and pulsed electric field techniques, their applications while coupled with enzymatic hydrolysis, their comparison and potential challenges for the production of antioxidant peptides from food proteins.
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Affiliation(s)
- Ildephonse Habinshuti
- INES-Ruhengeri, Institute of Applied Sciences, B.P. 155, Ruhengeri, Rwanda; Organization of African Academic Doctors (OAAD), Off Kamiti Road P.O. Box 25305-00100, Nairobi, Kenya; Thought For Food Foundation, 2101 Highland Ave, Birmingham, Alabama 35205, USA.
| | | | - Bertrand Muhoza
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China
| | - Falade Ebenezer
- Organization of African Academic Doctors (OAAD), Off Kamiti Road P.O. Box 25305-00100, Nairobi, Kenya
| | - Afusat Yinka Aregbe
- Organization of African Academic Doctors (OAAD), Off Kamiti Road P.O. Box 25305-00100, Nairobi, Kenya
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Zhang Z, Fan X, Zou L, Xing B, Zhu M, Yang X, Ren G, Yao Y, Zhang L, Qin P. Phytochemical properties and health benefits of pregelatinized Tartary buckwheat flour under different extrusion conditions. Front Nutr 2022; 9:1052730. [PMID: 36438721 PMCID: PMC9682129 DOI: 10.3389/fnut.2022.1052730] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 10/25/2022] [Indexed: 11/15/2023] Open
Abstract
This work investigated the phytochemical properties and health benefits of Tartary buckwheat flour obtained with different extrusion conditions including high, medium, and low temperature. Extrusion significantly decreased the fat content and changed the original color of Tartary buckwheat flour. The contents of protein, total flavonoids, and D-chiro-inositol were affected by the extrusion temperature and moisture. Extrusion significantly decreased the total flavonoids and flavonoid glycosides contents, while it significantly increased aglycones. Compared to native Tartary buckwheat flour and pregelatinization Tartary buckwheat flour obtained with traditional extrusion processing technology, the pregelatinization Tartary buckwheat flour obtained with improved extrusion processing technology contained higher aglycones and lower flavonoid glycosides, which had stronger antioxidant capacity, α-glucosidase inhibitory activity and relatively mild α-amylase inhibitory activity. Correlation analysis proved that the aglycone content was positively correlated with antioxidant and α-glucosidase inhibitory activities. These findings indicate that the pregelatinization Tartary buckwheat flour obtained with improved extrusion processing technology could be used as an ideal functional food resource with antioxidant and anti-diabetic potential.
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Affiliation(s)
- Zhuo Zhang
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, School of Life Sciences, Shanxi University, Taiyuan, China
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xin Fan
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Liang Zou
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Bao Xing
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, School of Life Sciences, Shanxi University, Taiyuan, China
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Manli Zhu
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, School of Life Sciences, Shanxi University, Taiyuan, China
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiushi Yang
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, China
| | - Guixing Ren
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industrialization, School of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Yang Yao
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lizhen Zhang
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, School of Life Sciences, Shanxi University, Taiyuan, China
| | - Peiyou Qin
- Key Laboratory of Quality Evaluation and Nutrition Health of Agro-Products, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
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Zhong M, Sun Y, Sun Y, Fang L, Qi B, Xie F, Li Y. Dynamic gastric stability and in vitro lipid digestion of soybean protein isolate and three storage protein-stabilized emulsions: Effects of ultrasonic treatment. Food Res Int 2021; 149:110666. [PMID: 34600668 DOI: 10.1016/j.foodres.2021.110666] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/02/2021] [Accepted: 08/24/2021] [Indexed: 11/26/2022]
Abstract
The emulsification of vegetable protein is closely related to solubility. The purpose of this study was to evaluate the effect of ultrasound on protein emulsification and to provide a prospective method for assessing the digestive properties of emulsions. In this article, we investigate the emulsion stability of ultrasonic pretreated soy protein isolate (SPI), and its three storage proteins, namely β-conglycinin (7S), lipophilic protein (LP), and glycinin (11S), under dynamic gastric conditions. The effects of these emulsions on lipolysis during digestion in the small intestine are also assessed using an in vitro dynamic human stomach simulator and a small intestine model. Particle size and ζ-potential measurements, as well as confocal laser scanning microscopy, revealed that during dynamic gastric digestion, the flocculation degree and floc size of 7S and soybean LP emulsions are larger than that of 11S and SPI emulsions. Meanwhile, ultrasound pretreatment of the proteins was found to prevent the agglomeration of the emulsion in a dynamic gastric environment. Moreover, enhanced flocculation delayed oil droplet delivery to the small intestine and subsequently retarded the release of lipophilic nutrients. The droplet size, molecular weight, and protein secondary structures of the ultrasonicated proteins were conducive to relatively higher rates and degrees of lipolysis in intestinal digestion than those of unsonicated proteins. Additionally, the slow-release effect of LP was superior to that of 11S and SPI, whereas 7S was comparatively more difficult to digest. The present study elucidated the fate of soy protein in the digestive tract and may facilitate microstructural food design to regulate physiological responses during digestion.
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Affiliation(s)
- Mingming Zhong
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Yufan Sun
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Yuanda Sun
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Lin Fang
- College of Food Science, Northeast Agricultural University, Harbin 150030, China
| | - Baokun Qi
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; National Research Center of Soybean Engineering and Technology, Harbin 150030, China; Heilongjiang Green Food Science Research Institute, Harbin 150028, China
| | - Fengying Xie
- College of Food Science, Northeast Agricultural University, Harbin 150030, China.
| | - Yang Li
- College of Food Science, Northeast Agricultural University, Harbin 150030, China; National Research Center of Soybean Engineering and Technology, Harbin 150030, China; Heilongjiang Green Food Science Research Institute, Harbin 150028, China.
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7
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Zhou Y, Jiang Q, Ma S, Zhou X. Effect of quercetin on the in vitro Tartary buckwheat starch digestibility. Int J Biol Macromol 2021; 183:818-830. [PMID: 33965481 DOI: 10.1016/j.ijbiomac.2021.05.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 03/04/2021] [Accepted: 05/02/2021] [Indexed: 11/29/2022]
Abstract
Tartary buckwheat is one of the few pseudocereals with abundant flavonoids and starch. However, there are different views on the digestibility of Tartary buckwheat starch (TBS) because of its particle size and structure. In this study, fluorescence spectrum methods and enzymatic kinetics were used to investigate the interaction between TBS /two glycosidase (α-amylase and α-glucosidase) and quercetin to explore its digestive properties and provide a perspective regarding the application of TBS in functional starch products. The results showed that the interaction between TBS and quercetin was probably weak hydrophobic force and hydrogen bonding. The inhibitory effect of quercetin on α-amylase was better than that on α-glucosidase. The half inhibitory concentrations (IC50) of quercetin to α-amylase and α- glucosidase was (270 ± 3.31) and (544 ± 9.01) μg/mL, respectively. The intrinsic fluorescence of two enzymes was statically quenched by forming a complex with quercetin. Quercetin also increased the microenvironment hydrophilicity of tryptophan residues in glycosidase. In vitro digestion experiment demonstrated that quercetin and TBS co-gelatinized together was more effective to inhibit TBS hydrolysis than quercetin itself alone. In the first-order kinetic and LOS model, quercetin-starch gel structure and quercetin inhibitory activity against enzymes had synergistic effects of the TBS digestion.
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Affiliation(s)
- Yiming Zhou
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Qingyi Jiang
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Sijia Ma
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Xiaoli Zhou
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China.
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Zou Y, Shahidi F, Shi H, Wang J, Huang Y, Xu W, Wang D. Values-added utilization of protein and hydrolysates from animal processing by-product livers: A review. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.02.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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9
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Response Surface Optimization of Enzymatic Hydrolysis of Peptides of Chinese Pecan (Carya cathayensis) and Analysis of Their Antioxidant Capacities and Structures. Int J Pept Res Ther 2021. [DOI: 10.1007/s10989-021-10164-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Microbial transglutaminase (MTGase) modified fish gelatin-γ-polyglutamic acid (γ-PGA): Rheological behavior, gelling properties, and structure. Food Chem 2021; 348:129093. [PMID: 33503534 DOI: 10.1016/j.foodchem.2021.129093] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/30/2020] [Accepted: 01/10/2021] [Indexed: 01/02/2023]
Abstract
Fish gelatin (FG) has been extensively studied as a potential substitute for mammal gelatin. However, FG often requires different modification methods to change its physical and chemical properties due to its low gelling properties. Here, γ-polyglutamic acid (γ-PGA) and microbial transglutaminase (MTGase) were combined to modify FG to improve its gelling properties. The γ-PGA at 0.04% (w/v) and MTGase of different concentrations (0.02-0.08%, w/v) were used to modify FG, and the effects of complex modification on the gelling properties and structure of FG were studied. When the MTGase content was 0.08% (w/v), FG had the best gelling properties. In addition, the complex modification of MTGase and γ-PGA hindered the formation of the triple helix during the FG gel process. This reduced the gel rate, but significantly increased its viscosity. A schematic model was also proposed to illustrate the complex modifications of FG by MTGase and γ-PGA.
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Tian R, Feng J, Huang G, Tian B, Zhang Y, Jiang L, Sui X. Ultrasound driven conformational and physicochemical changes of soy protein hydrolysates. ULTRASONICS SONOCHEMISTRY 2020; 68:105202. [PMID: 32593148 DOI: 10.1016/j.ultsonch.2020.105202] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 05/24/2020] [Accepted: 05/30/2020] [Indexed: 05/06/2023]
Abstract
The effect of ultrasound on the conformational and physicochemical properties of soy protein isolate hydrolysates (SPHs) was investigated. SPHs were prepared at hydrolysis times of 20 min, 60 min, and 180 min, then treated with ultrasound for 10 min, 20 min, and 30 min at a frequency of 20 kHz and output powers of 150 W and 450 W. The structural properties and antioxidant capacities of the aqueous layer of SPHs (ASPHs) after sonication were evaluated by Fourier-transform infrared spectroscopy (FTIR), intrinsic fluorescence, DPPH radical scavenging activity assays, and microscopy observations. Results obtained showed that ultrasound treatment significantly disrupted the peptide aggregates formed during protein hydrolysis. The protein solubility was significantly increased after sonication (by up to 18.33%), as did the percentage of proteins with MW < 1 kDa in ASPHs. The antioxidant capacity of ASPHs also increased, as measured by DPPH assay. FTIR analysis of ASPHs indicated that the protein secondary structures were different, with an increase in β-sheet and a decrease in α-helix and β-turn. Furthermore, the changes in fluorescence spectra of ASPHs showed the transition of protein tertiary structure with a greater exposure of Trp residues in the side chains. Scanning electron microscope (SEM) and atomic force microscope (AFM) observations of the morphological structure of ASPHs further confirmed the significant effect of sonication on disrupting peptide aggregates. In conclusion, ultrasound can be used as an efficient treatment to promote the solubility of protein hydrolysates.
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Affiliation(s)
- Ran Tian
- College of Food Science, Northeast Agricultural University, China
| | - Junran Feng
- College of Food Science, Northeast Agricultural University, China
| | - Guo Huang
- College of Food Science, Northeast Agricultural University, China
| | - Bo Tian
- College of Food Science, Northeast Agricultural University, China
| | - Yan Zhang
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin 150030, China
| | - Lianzhou Jiang
- College of Food Science, Northeast Agricultural University, China; National Research Center of Soybean Engineering and Technology, Harbin 150030, China
| | - Xiaonan Sui
- College of Food Science, Northeast Agricultural University, China; National Research Center of Soybean Engineering and Technology, Harbin 150030, China.
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