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首页> 外文期刊>RSC Advances >Structural and thermal analysis of a hyper-branched exopolysaccharide produced by submerged fermentation of mushroom mycelium
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Structural and thermal analysis of a hyper-branched exopolysaccharide produced by submerged fermentation of mushroom mycelium

机译：通过淹没发酵蘑菇菌丝体产生的超分支外糖的结构和热分析

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An exopolysaccharide (PTR-EPS1) purified from the culture medium of the mycelial fermentation of Pleurotus tuber-regium had a weight-average molecular mass of 173.6 kDa and a radius of 55.6 nm. Methylation analysis and NMR results indicated that PTR-EPS1 had a 81% degree of branching at O-2 and consisted of a backbone of 1,6-linked alpha-D-Manp residues branched at O-2 with either a terminal alpha-D-Manp or -(1,2)-alpha-D-Manp-(1,2)-alpha-D-Manp units. The morphology of PTR-EPS1 was found to be spherical by TEM. Thermal analysis indicated that the main thermal degradation (up to 77.56% dry mass) of PTR-EPS1 occurred within a temperature range of 205.7-331.2 degrees C. The apparent activation energy Ea and pre-exponential factor A of PTR-RES1 were found to be 223.4 kJ mol(-1) and 5.37 x 10(23) s(-1), respectively. This is the first report on the structural information and thermal degradation properties of PTR-EPS1. These results will facilitate the potential application of this mushroom polysaccharide as a novel biopolymer in the design of carbohydrate-based nanoparticles and food delivery systems.
机译：从Pleurotus Tuber-Regium的菌丝体发酵的培养基中纯化的外偶糖（PTR-EPS1）的重均分子量为173.6kDa，半径为55.6nm。甲基化分析和NMR结果表明，PTR-EPS1在O-2处具有81％的分支，并由1,6-连接的α-D-MANP残基组成，其中末端α-D分支为O-2 -manp或 - （1,2） - alpha-d-manp-（1,2）-alpha-d-manp单位。发现PTR-EPS1的形态通过TEM球形。热分析表明，PTR-EPS1的主要热降解（最高77.56％干质量）发生在205.7-331.2摄氏度的温度范围内。发现PTR-RES1的表观激活能量EA和预指数因子A分别为223.4 kJ mol（-1）和5.37 x 10（23）s（-1）。这是PTR-EPS1的结构信息和热降解特性的第一个报告。这些结果将促进该蘑菇多糖作为新型生物聚合物的潜在应用，该基于碳水化合物的纳米粒子和食物递送系统。

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  • 来源
    《RSC Advances》 |2016年第113期|共9页
  • 作者

    Chen L.; Cheng W. N.; Zhang B. B.; Cheung P. C. K.;

  • 作者单位

    Jiangnan Univ Sch Biotechnol Minist Educ Key Lab Ind Biotechnol Wuxi 214122 Peoples R China;

    Binzhou Med Univ Affiliated Hosp Dept Pharm Binzhou 256603 Peoples R China;

    Jiangnan Univ Sch Biotechnol Minist Educ Key Lab Ind Biotechnol Wuxi 214122 Peoples R China;

    Chinese Univ Hong Kong Sch Life Sci Shatin Hong Kong Peoples R China;

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  • 正文语种 eng
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