Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources

Hangzhou, China

Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources

Hangzhou, China
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He L.,Zhejiang University | Ji P.,Zhejiang University | Gong X.,Zhejiang University | Li W.,Zhejiang University | And 5 more authors.
International Journal of Biological Macromolecules | Year: 2011

A novel water-soluble polysaccharide pMTPS-3, obtained from Melia toosendan Sieb. Et Zucc fruit by hot-water extraction and ethanol precipitation, was fractionated by DEAE-52 cellulose anion-exchange and Sephadex G-100 gel filtration chromatography. Its primary structural features and molecular weight were characterized by Fourier infrared spectrometry (FTIR), gel permeation chromatography (GPC) and gas chromatography (GC). And the antioxidant activities of pMTPS-3 in vitro were evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay, superoxide radical scavenging assay and hydroxyl radical scavenging assay. The results suggested that pMTPS-3 was a heteropolysaccharide, composed of arabinose, glucose, mannose, and galactose in the molar ratio of 17.3:28.3:41.6:12.6 with molecular weight 26100Da. The purified pMTPS-3 was revealed to have notable scavenging activity against DPPH radical in a concentration-dependent manner and present a moderate inhibition of superoxide radicals with an IC50 (5.6mg/ml), and potent inhibiting power for hydroxyl radical compared with crude polysaccharide. Further, it exhibited strong inhibition effect in vitro on the growth of human gastric cancer BGC-823 cells. It is strongly evidenced that pMTPS-3 purified from the crude polysaccharides of Melia toosendan Sieb. Et Zucc could be explored as a potential antioxidant and therapeutics. © 2011 Elsevier B.V.


Yu H.-X.,Chinese Academy of Forestry | Yu H.-X.,Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources | Fang C.-R.,Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources | Xu M.-P.,Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources | And 2 more authors.
Journal of Wood Science | Year: 2015

The silk industry in China produces a large amount of mulberry branches as by-product every year. Mulberry branches have high longitudinal toughness and good overall mechanical properties. However, these branches are incinerated because their utility in other industries is limited by their small size. This study determines the feasibility of manufacturing scrimber from mulberry branches by using cold pressing method, followed by thermo-curing with different densities and resin contents. Results show that density [ranging from (0.81–1.24) g/cm3] exerts a greater effect on the shear strength, modulus of rupture (MOR), and modulus of elasticity (MOE) than resin content (changing from 8 to 20 %). The increase rate slows down when the density exceeds 1.1 g/cm3 and the resin content reaches more than 12 %. The strength-to-weight ratio analysis shows that the MOR/density and MOE/density maximum at 1.02–1.10 g/cm3. The density and resin contents of mulberry scrimber with cold compress and heat setting can be set to 1.0–1.1 g/cm3 and at approximately 12 %, respectively. The mechanical properties of the product meet the maximum requirement indicated in the Chinese national standard for construction. Mulberry scrimber can be a very promising supplement for wood because of its good performance, abundant supply, and renewability. © 2014, The Japan Wood Research Society.

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