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International Journal of Polymer Science
Volume 2014 (2014), Article ID 365310, 7 pages
http://dx.doi.org/10.1155/2014/365310
Research Article

Lactic Acid Yield Using Different Bacterial Strains, Its Purification, and Polymerization through Ring-Opening Reactions

1Materiales Unidades, Centro de Investigación Científica de Yucatán (CICY), Calle 40 No. 130, Colonia Chuburná de Hidalgo, 97200 Mérida, YUC, Mexico
2Renovables Unidad de Energía (CICY), Calle 40 No. 130, Colonia Chuburná de Hidalgo, 97200 Mérida, YUC, Mexico
3Laboratorio de Polymer Group SIMERQO, Universidad del Valle, Ciudad Universitaria, Meléndez, 25360 Cali, Valle del Cauca, Colombia

Received 19 September 2013; Revised 5 December 2013; Accepted 19 December 2013; Published 17 February 2014

Academic Editor: Peng He

Copyright © 2014 F. G. Orozco et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Laboratory-scale anaerobic fermentation was performed to obtain lactic acid from lactose, using five lactic acid bacteria: Lactococcus lactis, Lactobacillus bulgaricus, L. delbrueckii, L. plantarum, and L. delbrueckii lactis. A yield of 0.99 g lactic acid/g lactose was obtained with L. delbrueckii, from which a final concentration of 80.95 g/L aqueous solution was obtained through microfiltration, nanofiltration, and inverse osmosis membranes. The lactic acid was polymerized by means of ring-opening reactions (ROP) to obtain poly-DL-lactic acid (PDLLA), with a viscosity average molecular weight (Mv) of 19,264 g/mol.