AUTHOR=Pan-utai Wanida , Thitiprasert Sitanan , Pornpukdeewattana Soisuda 

TITLE=Arthrospira Cell Residues for Lactic Acid Fermentation as Bioproducts From Waste Utilization

JOURNAL=Frontiers in Energy Research

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.878597

DOI=10.3389/fenrg.2022.878597

ISSN=2296-598X

ABSTRACT=<p><italic>Arthrospira</italic> (<italic>Spirulina</italic>) <italic>platensis</italic> is a freshwater cyanobacterium that is commercially produced as a food source on a global scale and considered safe for human consumption. After C-phycocyanin (C-PC) extraction, the waste cell residue (WCR) is composed of nutrients with 30% protein content. Here, the potential of WCR as a nitrogen source for <italic>Bacillus coagulans</italic> cultivation and bioproducts was evaluated. Nitrogen substitute from WCR under different conditions of 20—100 g L<sup>−1</sup> was performed. <italic>B. coagulans</italic> cultivation was achieved with maximal viable cells at 7.6–9.5 log CFU mL<sup>−1</sup>. Increasing WCR gave decreasing lactate production. The highest lactate production at 27 g L<sup>−1</sup> was achieved from WCR 20 g L<sup>−1</sup>, highlighting the potential use of <italic>A. platensis</italic> waste biomass residue as a nitrogen source for the growth of lactic acid bacteria and zero-waste biotechnology methodology. The utilization of renewable resources is a crucial step toward developing a sustainable industrial society.</p>