Bioreduction of Se(IV) by Lactiplantibacillus plantarum NML21 and synthesis of selenium nanospheres Se(0).

Longlin Wang, Li Song, Pengjie Wang, Hao Zhang, Yiheng Li, Juan Song, Liwen Zhong, Caihong Liu, Weibing Zhang, Pengcheng Wen

Food chemistry 2024 Sep 15

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Selenium nanospheres (SeNPs) show less toxicity and greater bioavailability than selenite salts. This research demonstrated the substantial tolerance and efficient conversion of Se(IV) into SeNPs by Lactiplantibacillus plantarum NML21. The bioreduction process of Se(IV) and the properties of SeNPs, including their morphology, particle size, and stability, were investigated with techniques including SEM, EDX, TEM, XPS, FT-IR, dynamic light scattering, XRD, and Raman spectroscopy. Under high selenium stress, certain cells displayed significant deformation and rupture, and released SeNPs as the main product of the bioreduction of Se(IV). These SeNPs were red, amorphous, zero-valent, and spherical, with an average diameter of 160 nm. Spectroscopic analysis highlighted that the functional groups of CO and CO are key to the bioreduction of Se(IV). The study suggested preliminary mechanisms for the bioreduction of Se(IV) and the formation and release of SeNPs by lactic acid bacteria. NML21 may therefore be a promising candidate for SeNPs synthesis. Copyright © 2024 Elsevier Ltd. All rights reserved.

Citation

Longlin Wang, Li Song, Pengjie Wang, Hao Zhang, Yiheng Li, Juan Song, Liwen Zhong, Caihong Liu, Weibing Zhang, Pengcheng Wen. Bioreduction of Se(IV) by Lactiplantibacillus plantarum NML21 and synthesis of selenium nanospheres Se(0). Food chemistry. 2024 Sep 15;452:139595