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Huang Q, Liu L, Wu Y, Huang X, Wang G, Song H, Geng F, Luo P. Mechanism of differences in characteristics of thick/thin egg whites during storage: Physicochemical, functional and molecular structure characteristics analysis. Food Chem 2022; 369:130828. [PMID: 34488128 DOI: 10.1016/j.foodchem.2021.130828] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 07/13/2021] [Accepted: 08/06/2021] [Indexed: 12/19/2022]
Abstract
This study systematically analyzed and compared thechanges of physicochemical, functional and molecular structural characteristics between thick egg white (KEW) and thin egg white (NEW) during storage. Analysis of physicochemical properties showed that moisture content decreased significantly with the increase of pH during storage. KEW was gradually thinning, while NEW was closer to Newtonian fluid. Functional properties indicated that KEW thermal gel was gradually hard and brittle with the properties of NEW. KEW had better emulsifying property than NEW, and NEW had superior foaming ability. The α-helix and β-sheet in the FT-IR spectrum showed a downward trend, revealing secondary structure changed from order to disorder. Enhancement of fluorescence intensity indicated the structural unfolding and exposure of tryptophan residues. SDS-PAGE proved that OVO might be related to the difference between KEW and NEW characteristics. This study provided new idea and reference value for egg storage and diversified utilization of egg white.
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Affiliation(s)
- Qun Huang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China; Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu, Sichuan 610106, China.
| | - Lan Liu
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
| | - Yongyan Wu
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
| | - Xiang Huang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
| | - Guoze Wang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China.
| | - Hongbo Song
- Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China.
| | - Fang Geng
- Meat Processing Key Laboratory of Sichuan Province, School of Food and Biological Engineering, Chengdu University, Chengdu, Sichuan 610106, China.
| | - Peng Luo
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China.
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Milošević J, Petrić J, Jovčić B, Janković B, Polović N. Exploring the potential of infrared spectroscopy in qualitative and quantitative monitoring of ovalbumin amyloid fibrillation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 229:117882. [PMID: 31818644 DOI: 10.1016/j.saa.2019.117882] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 11/29/2019] [Accepted: 11/30/2019] [Indexed: 06/10/2023]
Abstract
Amyloid fibrils are highly ordered self-assembled (poly)peptide aggregates with cross-β structural pattern. Ovalbumin was used as a model for exploring the potential of infrared spectroscopy in detecting structural transitions and quantitative monitoring of amyloid fibrillation. Low pH (pH 2) and high temperature (90 °C) over the course of 24 h were conditions applied for amyloid formation. Fibrillation of ovalbumin was monitored by ThT and ANS fluorescence, and SDS PAGE. A significant increase in ThT fluorescence with a plateau reached after 4 h of incubation, without the lag phase, was detected. Structural transitions leading to amyloid fibrillation were analysed using all three Amide regions in ATR-FTIR spectra. Significant changes were detected in Amide I and Amide III region (decrease of α-helix and increase of β-sheet peaks). To establish a fast, precise and simple method for quantitative monitoring of amyloid fibrillation, the Amide I/Amide II ratios of aggregation specific β-sheets (1625 and 1695 cm-1, respectively) with 1540 cm-1 as internal standard were used, resulting in good correlation (R2 = 0.93 and 0.95) with the data observed by monitoring ThT fluorescence. On the other hand, assessing aggregation specific β-sheet contents by self-deconvolution showed lower correlation with ThT fluorescence (R2 = 0.75 and 0.64). Here we examined structural transitions during ovalbumin fibrillation in a qualitative and quantitative manner by exploiting the full potential of Amide regions simultaneously. Secondary structure distribution was monitored using second derivative spectra in Amide I region. A novel, simple mathematical calculation for quantitative monitoring of fibrils formation was presented employing that the increase in low and high frequency aggregation specific β-sheet in Amide I region compared to the internal standard in Amide II region is suitable for fibril formation monitoring.
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Affiliation(s)
- Jelica Milošević
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Jovan Petrić
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Branko Jovčić
- University of Belgrade - Faculty of Biology, Belgrade, Serbia; Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Brankica Janković
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Natalija Polović
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia.
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Iram A, Naeem A. Detection and analysis of protofibrils and fibrils of hemoglobin: implications for the pathogenesis and cure of heme loss related maladies. Arch Biochem Biophys 2013; 533:69-78. [PMID: 23500139 DOI: 10.1016/j.abb.2013.02.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 02/25/2013] [Accepted: 02/27/2013] [Indexed: 01/17/2023]
Abstract
TFE induces structural alterations of proteins similar to the lipid environment of biological membranes, implicating these studies worthy of analyzing protein conformation in membranes such as red blood cells (RBCs). Heme loss occurs on rupturing of RBCs as found in diseases namely haemophilia, haemolytic anaemia, diabetes mellitus. TFE can be implied in discovering therapeutic targets, as it mimics the biological membrane environment. A global transition of hemoglobin (Hb) in presence of TFE was studied by using multi-methodological approach. The presence of partially folded state of Hb at 15% v/v TFE was confirmed by altered tryptophan environment, and retention of native-like secondary and tertiary structure. Molten globule state was observed at 20% v/v TFE as detected by increase tryptophan and high ANS fluorescence, slight alterations in Soret band relative to native. TFE on increasing concentration induced protofibrils at 25% v/v and fibrils at 45% v/v as depicted by altered tryptophan environment, heme loss, increase in non-native β-sheet secondary and tertiary structure, large hydrodynamic radii of heme-protein, high ANS, thioflavin T fluorescence and shift in Congo Red absorbance. Comet assay showed that protofibrils are cytotoxic to lymphocytes. SEM and XRD confirmed these aggregates to be fibrillar in nature.
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Affiliation(s)
- Afshin Iram
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India
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Nakanishi K, Tomita M, Nakamura H, Kato K. Specific binding of immunoglobulin G to protein A–mesoporous silica composites for affinity column chromatography. J Mater Chem B 2013; 1:6321-6328. [DOI: 10.1039/c3tb20998a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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