Abstract
The purpose of this study was to investigate the capability of Streptococcus thermophilus TISTR 458 on hyaluronic acid (HA) production by using various carbon sources including glucose, sucrose and sugarcane molasses. HA production was determined using a turbidity assay by precipitation with cetyltrimethylammonium bromide (CTAB) and the sugar content was analysed by a sulphuric acid-UV spectrophotometry method. The results showed that S. thermophilus TISTR 458 produced the maximal yield of HA from glucose, sucrose and molasses at approximately 32.80 ± 4.27 (24 h), 79.03 ± 8.36 (24 h) and 213.44 ± 76.79 (12 h) mg/L, respectively, then decreased gradually. Moreover, an elevated level of HA was related to a reduction in the sugar content. It was concluded that S. thermophilus TISTR 458 can produce HA by using glucose, sucrose and molasses. Interestingly, molasses as a cheap agricultural by-product is a promising prospect carbon source for HA production by S. thermophilus TISTR 458.
 HIGHLIGHTS
 
 Searching for alternatives sources such as agro-industrial by-products to produce biomolecules has been an increasing trend nowadays
 Various carbon sources have been used for hyaluronic acid (HA) production by Streptococcus thermophilus TISTR 458, the culture collection in Thailand
 Sugarcane molasses, a cheap agricultural by-product was a promising prospect carbon source for HA production by thermophilus TISTR 458
 
 GRAPHICAL ABSTRACT
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