Simple Preparation of Diverse Neoagaro-Oligosaccharides

• Main Authors: Fudi Lin, Jing Ye, Yayan Huang, Yucheng Yang, Meitian Xiao
• Format: Article
• Language: English
• Published: MDPI AG 2019-05-01
• Series: Processes
• Subjects: agar; enzymatic hydrolysis; neoagaro-oligosaccharides; separation
• Online Access: https://www.mdpi.com/2227-9717/7/5/267

A simple method for obtaining pure and well-defined oligosaccharides was established by hydrolyzing agar with &#946;-agarase from <i>Vibrio natriegens</i>. The conditions for enzymolysis were optimized as follows: a temperature of 45 &#176;C, a pH of 8.5, a substrate concentration of 0.3%, an enzyme amount of 100 U/g and an enzymolysis time of 20 h. Neoagaro-oligosaccharides with different degrees of polymerization were obtained by hydrolyzing agar with &#946;-agarase for different lengths of time. After removing pigments using activated carbon and salts by dialyzing, the enzyme hydrolysis solution was separated with Bio-Gel P2 column chromatography. Neoagaro-oligosaccharides with different degrees of polymerization were acquired. By comparing with authentic standard substances, along with further confirmation by FTIR, MS and NMR, structures of the purified neoagaro-oligosaccharides were identified as neoagarobiose (NA2), neoagaroteraose (NA4), neoagarohexaose (NA6), neoagarooctaose (NA8), neoagaro-decaose (NA10) and neoagarododecaose (NA12) with purities of more than 97.0%. The present study established a method for the preparation of various neoagaro-oligosaccharides that may be of great significance for further study of their bioactivities.