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11.
Visa Thongrakard Nijsiri Ruangrungsi Maneerat Ekkapongpisit Ciro Isidoro Tewin Tencomnao 《Photochemistry and photobiology》2014,90(1):214-224
Thai traditional medicine employs a wide range of indigenous herbs in the forms of tincture or tea for the cure of skin and systemic inflammatory diseases. The protection by Thai plants extracts against UVB DNA damage and cytotoxicity was investigated in human keratinocytes. Petroleum ether, dichloromethane and ethanol extracts were prepared from 15 Thai herb species, and the total phenolic and flavonoid contents, the antioxidant and UV‐absorbing properties were assessed by standard procedures. Cytoprotective effects were evaluated on the basis of cell survival, caspase‐3 activity and pyrimidine dimers determination. High total phenolic and flavonoid contents were found in the ethanol and dichloromethane fractions. Dichloromethane extract of turmeric was shown to possess the highest antioxidant activity. The maximum UV absorptions were found in the ethanol extract of turmeric and in the dichloromethane extract of ginger. These extracts stimulated the synthesis of Thioredoxin 1, an antioxidant protein, and could protect human HaCaT keratinocytes from UV‐induced DNA damage and cytotoxicity. The present data support the utilization of turmeric and ginger extracts in anti‐UV cosmetic pharmaceuticals. 相似文献
12.
Two types of biosurfactant (BS)-producing bacteria, Bacillus licheniformis TR7 and Bacillus subtilis SA9, were isolated from mangrove sediment in the south of Thailand. The BS production was done by using only molasses as
a whole medium for growth and production. Under optimized conditions, the yields of TR7 and SA9 BS were found to be 3.30 and
3.78 g/l, respectively. It could reduce the surface tension of pure water to 28.5 and 29.5 mN/m, with the critical micelle
concentrations of about 10 and 30 mg/l, respectively. Good thermal, pH, and salt stability were exhibited. Both BSs could
recover oil more effectively than the two synthetic surfactants. In addition, TR7 and SA9 BS could enhance the solubility
of polyaromatic hydrocarbons (PAHs). Thus, these BSs have the potential for the removal of oil and PAHs from the combined
contaminated environment and facilitate its bioremediation. These studies indicate that molasses, as a renewable, relatively
inexpensive and easily available resource, can be used for important biotechnological processes. 相似文献