Structure characterization of a pyruvated exopolysaccharide from Lactobacillus plantarum AR307

Int J Biol Macromol. 2021 Feb 20:S0141-8130(21)00398-6. doi: 10.1016/j.ijbiomac.2021.02.119. Online ahead of print.ABSTRACTA pyruvated exopolysaccharide designated as LPE-1 was isolated and purified from the fermentation broth of Lactobacillus plantarum AR307 and characterized for its chemical structure. The results indicated that LPE-1 contained galactopyranose (Galp) and glucopyranose (Glcp) at a molar ratio of 2: 1. The weight-averaged molecular weight (Mw) of LPE-1 was 605 kDa, with a polydispersity index (PDI) of 1.57, intrinsic viscosity ([ƞ]) of 3.28 dL/g, Mark-Houwink-Sakurada exponent α of 0.65 and gyration of radius (Rg) of 36.10 nm. The results of GC-MS and NMR revealed that pyruvate (Pyr) was found to form cyclic ketals at O-4 and O-6 position of terminal galactopyranose (T-Galp). The backbone of LPE-1 was identified to be consisted of 1,4-β-D-Glcp (23.19%), 1,4-α-D-Glcp (11.38%) and 1,4,6-β-D-Galp (12.05%), branched by 1,6-β-D-Galp (38.88%) at O-6 position of 1,4,6-β-D-Galp residue and terminated by T-β-D-Galp (5.60%) or T-β-D-(4,6-Pyr)-Galp (8.90%). A possible structural unit was proposed for LPE-1 as follows: where Galp* is either T-β-D-(4,6-Pyr)-Galp or T-β-D-Galp. The presence of pyruvate group in LPE-1 would play an important role in improving the viscosity and plasticity of dairy products.PMID:33621574 | DOI:10.1016/j.ijbiomac.2021.02.119
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Source Type: research