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International Journal of Medicinal Mushrooms
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ISSN Imprimer: 1521-9437
ISSN En ligne: 1940-4344

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International Journal of Medicinal Mushrooms

DOI: 10.1615/IntJMedMushrooms.v18.i2.50
pages 141-154

Fractionation and Biological Activities of Water-Soluble Polysaccharides from Sclerotium of Tiger Milk Medicinal Mushroom, Lignosus rhinocerotis (Agaricomycetes)

Choong Yew Keong
Phytochemistry Unit, Herbal Medicine Research Centre, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia
Vimala B
Cardiovascular, Diabetes and Nutrition Research Centre, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia
Maelinda Daker
Molecular Pathology Unit, Cancer Research Centre, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia
Mohd Yusof Hamzah
Radiation Technology, Radiation Processing Division, Malaysia Nuclear Agency, Bangi, Kajang, Malaysia
Shaiful Azuar Mohamad
Agrotechnology and Biosciences Division, Malaysia Nuclear Agency, Bangi, Kajang, Selangor, Malaysia
Jin Lan
Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR. China
Xiangdong Chen
Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, PR. China
Yu-Ping Yang
National Research Institute for Family Planning of China, Haidian District, Beijing, PR. China

RÉSUMÉ

This study investigated antioxidant and anti-inflammatory properties, and the direct cytotoxic effect of Lignosus rhinocerotis fractions, especially the polysaccharide fraction, on nasopharyngeal carcinoma cells. L. rhinocerotis crude extract was obtained through hot water extraction. The precipitate saturated with 30% ammonium sulfate was purified with ion-exchanged chromatography. Gel permeation chromatography multiangle laser light scattering analysis equipped with light scattering and UV signals revealed two district groups of polymers. A total of four peaks were observed in the total carbohydrate test. Fraction C, which was the second region of the second peak eluted with 0.3 M NaOH, showed the highest integrated molecular weight, whereas fraction E had the lowest integrated molecular weight of 19,790 Da. Fraction A contained the highest β-D-glucan content. Enzymatic analysis showed that most of the polysaccharide fractions contained β-1-3 and β-1-6 skeletal backbones. The peak eluted with 0.6 M NaOH was separated in fraction D (flask 89−92) and fraction E (93−96). The results showed that fraction E expressed higher antioxidant activities than fraction D whereas fraction D expressed higher chelating activity than fraction E. The extract saturated with 30% ammonium sulfate exhibited higher reducing power than the extract saturated with 100% ammonium sulfate. Fractions D and E significantly inhibited the secretion of tumor necrosis factor-α in lipopolysaccharide-stimulated RAW 264.7 macrophages in a dose-dependent manner. There was no apparent difference in the viability of cells exposed or unexposed to L. rhinocerotis fractions.