SEASONAL EFFECT ON UV ABSORPTION PROPERTY OF AMARANTHUS SPINOSUS L. LEAVES
Tanaya Ghosh, Prasenjit Mitra and Pasanta Kumar Mitra*
ABSTRACT
Amaranthus spinosus linn. (A. spinous L.) is known to possess a wide range of pharmacological properties. Recently we have noted UV absorption property of ethanol extract of this plant leaves. It is known that pharmacological properties of medicinal plants are due to plant’s secondary metabolite. It is also known that amount of secondary metabolite in plant varies with season. The aim of the present work was, therefore, to ascertain seasonal effect on the UV absorption property of the plant leaves. Leaves of A. spinous L. were collected in winter, autumn, summer and rainy seasons. Ethanol extracts of the leaves were prepared separately. Extracts were scanned in a spectrophotometer (wavelength range from 200 nm to 400 nm) at 10 nm intervals to get absorption spectra. Amount of polyphenol in the leave extract was also checked to note correlation, if any, between poly phenol content and UV absorbing property of the plant leaves. Results showed that ethanol extract of A. spinous L. leaves of autumn had maximum UV absorbing property. Polyphenol content of the leaves was also high during autumn. Ethanol extract of A. spinous L. leaves of autumn, therefore, may be used for isolation of active compound responsible for UV absorption property as well as as anti solar agent in preparation of sun screen lotions.
Keywords: Amaranthus spinosus Linn. leaves, UV absorbing property, seasonal effect, polyphenols, sun screen lotion.
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