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<p>The extensive use of fossil fuels for producing plastics poses global warming and plastic pollution. Thus, it has become essential to develop sustainable bioplastics derived from renewable biomass. Nowadays, the world’s most rapidly evolving bio-based polymer is polylactic acid (PLA). The necessary key material for producing biodegradable plastic—PLA is lactic acid (LA). LA is an essential organic acid with several industrial applications known to be produced during fermentation. LA can be produced effectively by fermentation, but it has to be improved to reduce production costs and market rates. The study aimed to produce PLA from food waste (FW) using probiotic bacteria. Lactic acid bacteria (LAB) are harmless microorganisms that may produce a variety of chemicals associated with health benefits. Five <i>Lactobacillus</i> isolates were obtained from FW and were checked for their probiotic properties. Upstream process factors such as substrate concentration, agitation, static condition, pH, and fermentation period were investigated. After 48&#xa0;h at pH 5.0, a strain of <i>Lactiplantibacillus plantarum</i> FWLB4 generated 26.3 ± 0.3&#xa0;g/L of LA using 90% of the substrate FW for microbial LA production. n-butanol and ammonium sulphate (chaotropic salt) were used in a phase partitioning technique to extract LA from the fermentation broth. The melt polycondensation of LA to PLA was catalyzed by stannous octoate. To extensively analyze the structure and properties of obtained LA and PLA, different characterizations such as FTIR, NMR (<sup>1</sup>H &amp; <sup>13</sup>C), DSC, and TGA were employed.</p> Graphical Abstract <p></p>

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Microbial fermentation of food waste for lactic acid production and its conversion to polylactic acid using melt polycondensation method

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • T. Angelin Swetha,
  • Abhispa Bora,
  • Mingqian Wang,
  • Mohan Zheng,
  • Dong-Po Song,
  • Kunyu Zhang,
  • Syed S. Jaffer,
  • Paulraj Balaji,
  • Van-Huy Nguyen,
  • A. Arun

摘要

The extensive use of fossil fuels for producing plastics poses global warming and plastic pollution. Thus, it has become essential to develop sustainable bioplastics derived from renewable biomass. Nowadays, the world’s most rapidly evolving bio-based polymer is polylactic acid (PLA). The necessary key material for producing biodegradable plastic—PLA is lactic acid (LA). LA is an essential organic acid with several industrial applications known to be produced during fermentation. LA can be produced effectively by fermentation, but it has to be improved to reduce production costs and market rates. The study aimed to produce PLA from food waste (FW) using probiotic bacteria. Lactic acid bacteria (LAB) are harmless microorganisms that may produce a variety of chemicals associated with health benefits. Five Lactobacillus isolates were obtained from FW and were checked for their probiotic properties. Upstream process factors such as substrate concentration, agitation, static condition, pH, and fermentation period were investigated. After 48 h at pH 5.0, a strain of Lactiplantibacillus plantarum FWLB4 generated 26.3 ± 0.3 g/L of LA using 90% of the substrate FW for microbial LA production. n-butanol and ammonium sulphate (chaotropic salt) were used in a phase partitioning technique to extract LA from the fermentation broth. The melt polycondensation of LA to PLA was catalyzed by stannous octoate. To extensively analyze the structure and properties of obtained LA and PLA, different characterizations such as FTIR, NMR (1H & 13C), DSC, and TGA were employed.

Graphical Abstract