Abstract
Soybean is a crop of important economic significance and soy hull is the residual by-product of soybean processing industry. In this study, cellulose nanocrystals were extracted from soy hull using a combined acid hydrolysis-ultrasonic treatment process, and its structure, properties, and antimicrobial activity were investigated. Fourier-transform infrared spectroscopy revealed the presence of hydrogen and ester bonds in the soy hull nanocrystalline cellulose (SHNC), whereas scanning electron microscopy showed that the SHNC was globular or short-rod shaped with diameters in the range of 20–50 nm. The molecular weight of SHNC was 213,935 Da and the extraction yield was 11.42 %. Meanwhile, SHNC also had high crystallinity (55.59 %), thermal stability, transparency (80 %), and UV resistance. Notably, SHNC exhibited an excellent bacteriostatic effect against Escherichia coli and Staphylococcus aureus, whose bacteriostatic percentage reached 69.33 %. Meanwhile, this study provided a new idea for the high value utilization of waste soy hull.
Acknowledgments
This study was supported by Liaoning Province Department of Education Fund (Grant No. LJKMZ20221489).
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The author(s) have (has) accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The author(s) state(s) no conflict of interest.
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Research funding: National Natural Science Fundation of China (Grant No. 32472389).
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Data availability: The raw data can be obtained on request from the corresponding author.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/ijfe-2025-0055).
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