tailieunhanh - Báo cáo " Nghiên cứu tích tụ selenium ở nấm vân chi Trametes versicolor bằng phân tích kích hoạt neutron"

Nghiên cứu tích tụ selenium ở nấm vân chi Trametes versicolor bằng phân tích kích hoạt neutron | TẠP CHÍ KHOA HỌC VÀ CÔNG NGHỆ Tập 47 số 1 2009 Tr. 73-79 STUDY ON SELENIUM ACCUMULATION IN TURKEY TAIL FUNGUS TRAMETES VERSICOLOR BY USING INSTRUMENTAL NEUTRON ACTIVATION ANALYSIS LE XUAN THAM NGUYEN GIANG NGUYEN THI DIEU HANH 1. INTRODUCTION The selenium enrichment would be encouraged to improve the potentially active complexes of polysaccharides and peptides from fungi particularly their antioxydative and antitumor properties. Se plays an essential nutritional role in many animals and humans as integral components of several enzymes 4 . Se would be an antioxidant and antimutagenic agent that can prevent the malignant transformation of normal cells and effectively inhibit the activation of oncogenes 16 Selenium Se is now well established as an essential trace element for both human beings and many other forms of life. Se-enrichment technologies have been developed with yeasts Saccharomyces cerevisae for medical preparations as Se-rich yeast biomass that is rich in proteins and SH-groups - a new anti-ageing medicaments with highly active scavengers with SeH-groups for toxic free radicals. The preparations of Se-enriched yeasts have been commercialized quite widely. However the yeasts don t need Se as essential micronutritive and also selenoproteins. In fact the studies on Se-enrichments in higher fungi particularly medicinal mushrooms . Button mushroom Agaricus bisporus Lingzhi Mannentake Ganoderma lucidum Oyster mushroom Houbitake Pleurotus ostreatus Sitting hen mushroom Maitake Grifola frondosa . have just been started recently 19 14 3 particularly for accumulation in mycelial biomass. The accumulation of some bioactive minerals in fungal fermentation has been widely examined under nuclear method-aided researches and development. Anderson et al. 1978 Toepfer et al. 1977 using 5lCr and biochemical analysis determined Cr-enrichment in fermented biomass of the yeast Saccharomyces carlsbergensis to obtain effectively anti-diabetic preparations. Many works dealing