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Gel properties of salty liquid whole egg as affected by preheat treatment

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Abstract

Heat treatment is an indispensable processing step of seasoned liquid egg. The effects of preheat treatment (60–75 °C) on gel properties of liquid whole egg (LWE) at different NaCl concentrations (0–3%, w/w) were investigated to provide guidance for the production of salty LWE. Results showed that LWE exhibited higher particle size after heating, with coincidental increases in surface hydrophobicity and decreases in protein solubility. While LWE with NaCl added exhibited increase in protein solubility and decrease in particle size of aggregates. Electrophoresis and optical microscopy showed that NaCl would induce the transformation of egg granules from insoluble form to soluble form, inhibiting the aggregation of LWE proteins during preheat treatment, reflected by the reduced particle size. The analysis of gel aggregated force and texture indicated that NaCl addition and preheat treatment can improve gelling properties of LWE synergistically by strengthening the hydrophobic interaction and hydrogen bonds.

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Acknowledgements

This study was funded by the National Key Research and Development Program of China (No. 2018YFD0400303), the Natural Science Foundation of Jiangsu Province for the Youth (No. BK20180610), the National Natural Science Foundation for the Youth of China (No. 31801483), the Fundamental Research Funds for the Central Universities (JUSRP11902), and the project of China Scholarship Council.

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  1. Junhua Li and Chenying Wang were listed as joint first authors.

Authors and Affiliations

  1. State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China

    Junhua Li, Chenying Wang, Luping Gu, Yujie Su, Cuihua Chang & Yanjun Yang

  2. School of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China

    Junhua Li, Chenying Wang, Luping Gu, Yujie Su, Cuihua Chang & Yanjun Yang

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  1. Junhua Li
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  2. Chenying Wang
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  3. Luping Gu
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  4. Yujie Su
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  5. Cuihua Chang
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  6. Yanjun Yang
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Correspondence to Cuihua Chang or Yanjun Yang.

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Li, J., Wang, C., Gu, L. et al. Gel properties of salty liquid whole egg as affected by preheat treatment. J Food Sci Technol 57, 877–885 (2020). https://doi.org/10.1007/s13197-019-04119-4

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  • DOI: https://doi.org/10.1007/s13197-019-04119-4

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