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Stachurska K, Marcisz U, Długosz M, Antosiewicz JM. Kinetics of Structural Transitions Induced by Sodium Dodecyl Sulfate in α-Chymotrypsin. ACS OMEGA 2023; 8:49137-49149. [PMID: 38162786 PMCID: PMC10753550 DOI: 10.1021/acsomega.3c07256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/16/2023] [Accepted: 11/23/2023] [Indexed: 01/03/2024]
Abstract
The temporal changes in circular dichroism at 222 and 260 nm were recorded by using stopped-flow spectroscopy after mixing α-chymotrypsin solutions with sodium dodecyl sulfate solutions. Simultaneously with the circular dichroism signal, the fluorescence emission was recorded. Changes in the secondary and tertiary structures of chymotrypsin induced by sodium dodecyl sulfate are characterized by either three or four one-way reactions with relaxation amplitudes and times precisely determined by an advanced numerical procedure of Kuzmič. Quantitatively, transitions within the secondary and tertiary structures of the protein are significantly different. Moreover, changes in the tertiary structure depend on the type of recorded signal (either circular dichroism or fluorescence) and the wavelength of the incident radiation. The latter observation is particularly interesting as it indicates that the contributions of protein's different tryptophans to the total recorded fluorescence depend on the excitation wavelength. We present several results justifying this hypothesis.
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Affiliation(s)
- Karolina Stachurska
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Urszula Marcisz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Maciej Długosz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
| | - Jan M. Antosiewicz
- Biophysics Division, Institute of Experimental
Physics, Faculty of Physics, University
of Warsaw, Pasteura 5 Street, 02-093 Warsaw, Poland
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2
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Tao Y, Wang P, Xu X, Chen J, Huang M, Zhang W. Effects of ultrasound treatment on the morphological characteristics, structures and emulsifying properties of genipin cross-linked myofibrillar protein. ULTRASONICS SONOCHEMISTRY 2023; 97:106467. [PMID: 37290150 PMCID: PMC10279922 DOI: 10.1016/j.ultsonch.2023.106467] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 04/20/2023] [Accepted: 05/31/2023] [Indexed: 06/10/2023]
Abstract
Genipin is a natural crosslinker that improves the functional properties of proteins by modifying its structures. This study aimed to investigate the effects of sonication on the emulsifying properties of different genipin concentration-induced myofibrillar protein (MP) cross-linking. The structural characteristics, solubility, emulsifying properties, and rheological properties of genipin-induced MP crosslinking without sonication (Native), sonication before crosslinking (UMP), and sonication after crosslinking (MPU) treatments were determined, and the interaction between genipin and MP were estimated by molecular docking. The results demonstrated that hydrogen bond might be the main forces for genipin binding to the MP, and 0.5 μM/mg genipin was a desirable concentration for protein cross-linking to improve MP emulsion stability. Ultrasound treatment before and after crosslinking were better than Native treatment to improve the emulsifying stability index (ESI) of MP. Among the three treatment groups at the 0.5 μM/mg genipin treatment, the MPU treatment group showed the smallest size, most uniform protein particle distribution, and the highest ESI (59.89%). Additionally, the highest α-helix (41.96%) in the MPU + G5 group may be conducive to the formation of a stable and multilayer oil-water interface. Furthermore, the free groups, solubility, and protein exposure extent of the MPU groups were higher than those of UMP and Native groups. Therefore, this work suggests that the treatment of cross-linking followed by ultrasound (MPU) could be a desirable approach for improving the emulsifying stability of MP.
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Affiliation(s)
- Ye Tao
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
| | - Peng Wang
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
| | - Xinglian Xu
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China.
| | - Jiahui Chen
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
| | - Mingyuan Huang
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
| | - Weiyi Zhang
- Key Laboratory of Meat Processing, Ministry of Agriculture, State Key Lab of Meat Quality Control and Cultured Meat Development, Ministry of Science and Technology, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
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3
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Hao J, Wang Q, Li X, Xu D. Extraction of structurally intact and well-stabilized rice bran oil bodies as natural pre-emulsified O/W emulsions and investigation of their rheological properties and components interaction. Food Res Int 2023; 164:112457. [PMID: 36738012 DOI: 10.1016/j.foodres.2023.112457] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 01/02/2023] [Accepted: 01/02/2023] [Indexed: 01/06/2023]
Abstract
The isolated plant oil bodies (OBs) have shown promising applications as natural pre-emulsified O/W emulsions. Rice bran OBs can be used as a new type plant-based resource with superior fatty acids composition and abundant γ-oryzanol. This paper investigated the method of extracting structurally intact and stable rice bran OBs. Due to the adequate steric hindrance and electrostatic repulsion effects, rice bran OBs extracted by NaHCO3 medium had smaller particle size, better physical stability, and natural structure. The protein profile of NaHCO3-extracted rice bran OBs showed oleosin-L and oleosin-H, while exogenous proteins in PBS and enzyme-assisted- extracted rice bran OBs could interact with interfacial proteins through hydrophobic forces to aggregate adjacent OBs, further remodeling the OBs interface. It was also found that the small-sized rice bran OBs could adsorb on the interface of the larger-sized rice bran OBs like Pickering stabilizers. Rice bran OBs exhibited pseudoplastic fluids characteristic, but underwent a transition from solid-like to liquid-like behavior depending on the extraction method. The disorder of NaHCO3-extracted rice bran OBs protein molecules increased their surface hydrophobicity. The random coil structure favored more proteins adsorption at the interface of rice bran OBs extracted by PBS. Enzyme-assisted extraction of rice bran OBs had the highest content of β-sheet structure, which facilitated the stretching and aggregation of protein spatial structure. It was also confirmed the hydrogen bonding and hydrophobic interaction between the triacylglycerol or phospholipid and proteins molecules, and the membrane compositions of rice bran OBs differed between extraction methods.
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Affiliation(s)
- Jia Hao
- School of Food and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health (BTBU), Beijing Engineering and Technology Research Center of Food Additives, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, Beijing Key Laboratory of Flavor Chemistry, Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, 100048 Beijing, China
| | - Qiuyu Wang
- School of Food and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health (BTBU), Beijing Engineering and Technology Research Center of Food Additives, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, Beijing Key Laboratory of Flavor Chemistry, Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, 100048 Beijing, China
| | - Xiaoyu Li
- School of Food and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health (BTBU), Beijing Engineering and Technology Research Center of Food Additives, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, Beijing Key Laboratory of Flavor Chemistry, Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, 100048 Beijing, China
| | - Duoxia Xu
- School of Food and Health, Beijing Advanced Innovation Center for Food Nutrition and Human Health (BTBU), Beijing Engineering and Technology Research Center of Food Additives, Beijing Higher Institution Engineering Research Center of Food Additives and Ingredients, Beijing Key Laboratory of Flavor Chemistry, Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, 100048 Beijing, China.
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4
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Wu M, Liu M, Wang F, Cai J, Luo Q, Li S, Zhu J, Tang Z, Fang Z, Wang C, Chen H. The inhibition mechanism of polyphenols from Phyllanthus emblica Linn. fruit on acetylcholinesterase: A interaction, kinetic, spectroscopic, and molecular simulation study. Food Res Int 2022; 158:111497. [DOI: 10.1016/j.foodres.2022.111497] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/20/2022] [Accepted: 06/08/2022] [Indexed: 11/04/2022]
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5
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Rawson KM, Lacey MM, Strong PN, Miller K. Improving the Therapeutic Index of Smp24, a Venom-Derived Antimicrobial Peptide: Increased Activity against Gram-Negative Bacteria. Int J Mol Sci 2022; 23:ijms23147979. [PMID: 35887325 PMCID: PMC9320964 DOI: 10.3390/ijms23147979] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 07/13/2022] [Accepted: 07/18/2022] [Indexed: 11/16/2022] Open
Abstract
Antimicrobial peptides (AMPs) are naturally occurring compounds which possess a rapid killing mechanism and low resistance potential. Consequently, they are being viewed as potential alternatives to traditional antibiotics. One of the major factors limiting further development of AMPs is off-target toxicity. Enhancements to antimicrobial peptides which can maximise antimicrobial activity whilst reducing mammalian cytotoxicity would make these peptides more attractive as future pharmaceuticals. We have previously characterised Smp24, an AMP derived from the venom of the scorpion Scorpio maurus palmatus. This study sought to better understand the relationship between the structure, function and bacterial selectivity of this peptide by performing single amino acid substitutions. The antimicrobial, haemolytic and cytotoxic activity of modified Smp24 peptides was determined. The results of these investigations were compared with the activity of native Smp24 to determine which modifications produced enhanced therapeutic indices. The structure–function relationship of Smp24 was investigated by performing N-terminal, mid-chain and C-terminal amino acid substitutions and determining the effect that they had on the antimicrobial and cytotoxic activity of the peptide. Increased charge at the N-, mid- and C-termini of the peptide resulted in increased antimicrobial activity. Increased hydrophobicity at the N-terminus resulted in reduced haemolysis and cytotoxicity. Reduced antimicrobial, haemolytic and cytotoxic activity was observed by increased hydrophobicity at the mid-chain. Functional improvements have been made to modified peptides when compared with native Smp24, which has produced peptides with enhanced therapeutic indices.
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6
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Stachurska K, Marcisz U, Długosz M, Antosiewicz JM. Circular Dichroism Spectra of α-Chymotrypsin-SDS Solutions Depend on the Procedure of Their Preparation. ACS OMEGA 2022; 7:23782-23789. [PMID: 35847307 PMCID: PMC9280762 DOI: 10.1021/acsomega.2c02438] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We recorded the far- and near-UV circular dichroism (CD) spectra of solutions of α-chymotrypsin and sodium dodecyl sulfate (SDS) with the final surfactant concentration significantly above the critical micellization concentration. Solutions were prepared using three different procedures. The reference procedure was to mix the chymotrypsin solution with the SDS solution once, immediately achieving the final SDS concentration. In alternative procedures, the protein solutions initially contained some SDS and were mixed with pure SDS solutions at a concentration to provide the same final surfactant as the reference mixing. We demonstrate that the supplementation to the selected final concentration of SDS of the pure chymotrypsin solution leads to different CD spectra than the supplementation to this final concentration of SDS in the chymotrypsin solution containing a small concentration of a few millimolar SDS. These differences disappear when the initial concentration of SDS in the protein solution, which we then supplement to the indicated final concentration, is higher. This suggests the irreversibility of the processes caused by the addition of SDS to chymotrypsin and the influence of the initial amount of this surfactant on the processes occurring with its further addition to the solution. For quantitative analysis of far-UV CD spectra in terms of populations of protein secondary structure elements, we used four well-established software packages. All programs consistently indicate that the observed differences in the far-UV CD spectra can be explained by the differences in the increase in the population of helical forms in chymotrypsin under the influence of SDS.
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Affiliation(s)
- Karolina Stachurska
- Biophysics Division, Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5 Strasse, 02-093 Warsaw, Poland
| | - Urszula Marcisz
- Biophysics Division, Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5 Strasse, 02-093 Warsaw, Poland
| | - Maciej Długosz
- Biophysics Division, Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5 Strasse, 02-093 Warsaw, Poland
| | - Jan M. Antosiewicz
- Biophysics Division, Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5 Strasse, 02-093 Warsaw, Poland
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7
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Zhang W, Zhao P, Li J, Wang X, Hou J, Jiang Z. Effects of ultrasound synergized with microwave on structure and functional properties of transglutaminase-crosslinked whey protein isolate. ULTRASONICS SONOCHEMISTRY 2022; 83:105935. [PMID: 35114555 PMCID: PMC8818559 DOI: 10.1016/j.ultsonch.2022.105935] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/18/2022] [Accepted: 01/23/2022] [Indexed: 05/08/2023]
Abstract
In the present study, ultrasound (400 W, U), microwave heating (75 ℃ for 15 min, M) and ultrasound synergized with microwave heating (UM) pretreatments of whey protein isolate (WPI) were applied to investigate and compare their influence on structure, physicochemical and functional characteristic of transglutaminase (TGase)-induced WPI. From the results of size exclusion chromatography, it could be seen that all three physical pretreatments could promote the formation of polymers in TGase cross-linked WPI, whose polymer amounts were increased by the order of U, UM and M pretreatment. Among three physical methods, M pretreatment had the strongest effect on structure and functional characteristics of TGase-induced WPI. Furthermore, compared with TGase-induced WPI, α-helix and β-turn of M-treated TGase-induced WPI (M-WPI-TGase) were reduced by 7.86% and 2.93%, whereas its β-sheet and irregular curl were increased by 15.37% and 7.23%. Zeta potential, emulsion stability and foaming stability of M-WPI-TGase were increased by 7.8%, 59.27% and 28.95%, respectively. This experiment exhibited that M was a more effective pretreatment method than U, UM for WPI, which could promote its reaction with TGase and improve its functional properties.
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Affiliation(s)
- Wenjuan Zhang
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China
| | - Panpan Zhao
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China
| | - Jinzhe Li
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China
| | - Xindi Wang
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China
| | - Juncai Hou
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China.
| | - Zhanmei Jiang
- Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, Harbin 150030, PR China.
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8
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Zhang J, Zhou G, Chen L, Sun L, Fei L, Lyu F, Ding Y. Effect of infrared radiation on activity and conformation of polyphenol oxidase from Acetes chinensis. J Food Sci 2021; 86:4500-4510. [PMID: 34519050 DOI: 10.1111/1750-3841.15914] [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: 05/31/2021] [Revised: 08/19/2021] [Accepted: 08/20/2021] [Indexed: 11/26/2022]
Abstract
The aim of this paper was to study the effect of infrared radiation (IR) on the activity and conformation of polyphenol oxidase (PPO) in Acetes chinensis. In this paper, the specific activity of PPO was increased from 21.2 to 643.4 U/mg by a four-step purification. The results showed that IR treatment had greater effect on the enzyme activity and conformation of PPO than hot air (HA) treatment. After IR treatment at 70°C, the relative enzyme activity of PPO was 9.28%, the surface hydrophobicity index increased by 80.42%, and the content of sulfhydryl group decreased to 96.99% of the control group. The results of circular dichroism (CD) and Fourier transform infrared spectroscopy (FTIR) showed that the α-helix of PPO treated by IR decreased and the random coil increased. The intrinsic fluorescence intensity of PPO decreased after IR treatment, indicating that the tertiary structure of PPO was destroyed. Scanning electron microscopy (SEM) results showed that the surface microstructure of PPO after IR treatment became clear and compact. In conclusion, IR treatment can completely destroy the secondary structure and tertiary structure of PPO and cause enzyme inactivation. This study provides a treatment for reducing the activity of PPO from A. chinensis during the production and processing. PRACTICAL APPLICATION: This study shows that IR treatment has a better inhibitory effect on the activity of PPO than HA treatment. It provides a better treatment method for inactivating the activity of PPO from Acetes chinensis during the production and processing.
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Affiliation(s)
- Jianyou Zhang
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China.,Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, China
| | - Guangcheng Zhou
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China
| | - Lifan Chen
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China
| | - Lei Sun
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China
| | - Lifeng Fei
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China
| | - Fei Lyu
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China.,Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, China
| | - Yuting Ding
- College of Food Science and Technology, Zhejiang University of Technology, Hangzhou, China.,Key Laboratory of Marine Fishery Resources Exploitment & Utilization of Zhejiang Province, Hangzhou, China.,National R&D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou, China.,Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian, China
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9
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Li X, Bai Y, Ji H, Jin Z. The binding mechanism between cyclodextrins and pullulanase: A molecular docking, isothermal titration calorimetry, circular dichroism and fluorescence study. Food Chem 2020; 321:126750. [DOI: 10.1016/j.foodchem.2020.126750] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 04/03/2020] [Accepted: 04/03/2020] [Indexed: 02/06/2023]
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10
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Li Z, Wang J, Zheng B, Guo Z. Impact of combined ultrasound-microwave treatment on structural and functional properties of golden threadfin bream (Nemipterus virgatus) myofibrillar proteins and hydrolysates. ULTRASONICS SONOCHEMISTRY 2020; 65:105063. [PMID: 32199256 DOI: 10.1016/j.ultsonch.2020.105063] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Revised: 03/07/2020] [Accepted: 03/08/2020] [Indexed: 05/13/2023]
Abstract
The effects of microwave, ultrasound and combined ultrasound-microwave (UM) treatment with different intensities on structural and hydrolysis properties of myofibrillar protein (MP) were investigated. Freeradical scavenging ability, angiotensin-I-converting enzyme (ACE) inhibitory activity, and cellular antioxidant and anti-inflammatory abilities of the related bioactive peptides were also evaluated. Raman spectroscopic analysis indicated that MP molecule tended to unfold and stretch with increasing in β-turn and random coil content under mild microwave (100 W), ultrasound (100-200 W) and combined UM treatments. Meanwhile, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) revealed these treatments could also improve the thermal stability against heat-induced denaturation and degeneration. The 200 W ultrasound treatment clearly increased MP solubility by disrupting the highly-ordered aggregates into smaller filament and fragment structures. The 300 W ultrasound coupled with 100 W microwave treatment further enhanced these effects. The resulting partially denatured structure induced by suitable ultrasound and combined UM treatments increased the susceptibility of MP to exogenous enzymes, thereby accelerating hydrolytic process and yielding a high peptide concentration in MP hydrolysates. MP peptides could effectively inhibit free radical and ACE activity, which also improved the ability of antioxidant defence system, and suppressed the production of proinflammatory cytokines in RAW 264.7 cells stimulated by H2O2. The combination of 100 W microwave and 300 W ultrasound treatment was optimal method for generating bioactive MP peptides with the strongest multi-activity effects against H2O2-induced cell damage.
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Affiliation(s)
- Zhiyu Li
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian 350002, China; China-Ireland International Cooperation Centre for Food Material Science and Structure Design, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Jianyi Wang
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian 350002, China; China-Ireland International Cooperation Centre for Food Material Science and Structure Design, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Baodong Zheng
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian 350002, China; China-Ireland International Cooperation Centre for Food Material Science and Structure Design, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; State Key Laboratory of Food Safety and Technology for Meat Products, Xiamen, Fujian 361100, China; Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Zebin Guo
- Engineering Research Centre of Fujian-Taiwan Special Marine Food Processing and Nutrition, Ministry of Education, Fuzhou, Fujian 350002, China; China-Ireland International Cooperation Centre for Food Material Science and Structure Design, Fujian Agriculture and Forestry University, Fuzhou 350002, China; College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; State Key Laboratory of Food Safety and Technology for Meat Products, Xiamen, Fujian 361100, China; Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
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11
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Liu S, Xie L, Shen M, Xiao Y, Yu Q, Chen Y, Xie J. Dual modifications on the gelatinization, textural, and morphology properties of pea starch by sodium carbonate and Mesona chinensis polysaccharide. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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12
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Tan L, Hong P, Yang P, Zhou C, Xiao D, Zhong T. Correlation Between the Water Solubility and Secondary Structure of Tilapia-Soybean Protein Co-Precipitates. Molecules 2019; 24:molecules24234337. [PMID: 31783603 PMCID: PMC6930460 DOI: 10.3390/molecules24234337] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 11/16/2019] [Accepted: 11/26/2019] [Indexed: 11/16/2022] Open
Abstract
The secondary structure of a protein has been identified to be a crucial indicator that governs its water solubility. Tilapia protein isolate (TPI), soybean protein isolate (SPI), and tilapia-soybean protein co-precipitates (TSPC3:1, TSPC2:1, TSPC1:1, TSPC1:2, and TSPC1:3) were prepared by mixing tilapia meat and soybean meal at different mass ratios. The results demonstrated that the water solubility of TSPCs was significantly greater than that of TPI (p <0.05). The changes in ultraviolet–visible and near-ultraviolet circular dichroism spectra indicated that the local structure of TSPCs was different from that of TPI and SPI. Fourier transform infrared Spectroscopy revealed the co-existence of TPI and SPI structures in TSPCs. The secondary structures of TSPCs were predominantly α-helix and β-sheet. TSPC1:1 was unique compared to the other TSPCs. In addition, there was a good correlation between the water solubility and secondary structure of TSPCs, in which the correlation coefficients of α-helix and β-sheet were −0.964 (p <0.01) and 0.743, respectively. TSPCs displayed lower α-helix contents and higher β-sheet contents compared to TPI, which resulted in a significant increase in their water solubility. Our findings could provide insight into the structure–function relationship of food proteins, thus creating more opportunities to develop innovative applications for mixed proteins.
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Affiliation(s)
- Li Tan
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
| | - Pengzhi Hong
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524088, China
| | - Ping Yang
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
| | - Chunxia Zhou
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524088, China
- Correspondence: ; Tel.: +86‐13828262885
| | - Dinghao Xiao
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
| | - Tanjun Zhong
- College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; (L.T.); (P.H.); (P.Y.); (D.X.); (T.Z.)
- Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Zhanjiang 524088, China
- Guangdong Provincial Engineering Technology Research Center of Marine Food, Zhanjiang 524088, China
- Guangdong Provincial Modern Agricultural Science and Technology Innovation Center, Zhanjiang 524088, China
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