4.8 Article

The potential of Burkholderia thailandensis E264 for co-valorization of C5 and C6 sugars into multiple value-added bio-products

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BIORESOURCE TECHNOLOGY
卷 387, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2023.129595

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Polyhydroxyalkanoates; Rhamnolipids; Glucose; Xylose; Burkholderia

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This study found that Burkholderia thailandensis can simultaneously uptake glucose and xylose and accumulate up to 64% of its dry mass as poly(3-hydroxyalkanoate) (PHA) biopolymers, with a PHA titer of up to 3.8 g L-1 in shake flasks. Concomitantly, it also produced rhamnolipids, mainly Rha-Rha-C14-C14, with a titer typically in the range of 0.2-0.4 g L-1. Gluconic and xylonic acids were detected in titers of up to 5.3 g L-1, with xylonic acid being the major end product. This co-production of three products from mixed sugars using B. thailandensis can improve biorefinery economics.
Despite known metabolic versatility of Burkholderia spp., sugar metabolism and end-product synthesis patterns in Burkholderia thailandensis have been poorly characterized. This work has demonstrated that B. thailandensis is capable of simultaneously uptaking glucose and xylose and accumulating up to 64% of its dry mass as poly(3-hydroxyalkanoate) (PHA) biopolymers, resulting in a PHA titer of up to 3.8 g L-1 in shake flasks. Rhamnoli-pids - mainly (68-75%) in the form of Rha-Rha-C14-C14 - were produced concomitantly with a titer typically in the range of 0.2-0.4 g L-1. Gluconic and xylonic acids were also detected in titers of up to 5.3 g L-1, and while gluconic acid appeared to be back consumed, xylonic acid formed as a major end product. This first example of co-production of three products from mixed sugars using B. thailandensis paves the way for improving biorefinery economics.

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