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. 2022 May 26;10:857976. doi: 10.3389/fchem.2022.857976

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Copyright © 2022 Ji, Zhou, Zhang and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Swelling curve of different gelatin films. (A) At the pH of the gelatin films isoelectric point, (B) At pH 5.6, (C) At pH 2 (the dashed lines indicate the samples dissolved in the water and cannot be observed).