Abstract
Abstract: Extract from medicinal plants are widely used to prevents various diseases due to presence of lots of phytochemicals. The extracts from different parts like leaf, stem, fruit, flower, bark, root of Azadirachta indica, Aloe vera and Allium cepa shows lots of pharmacological activity. Antidiabaetic property is most important of them. Various parts of Azadirachta indica, Aloe vera and Allium cepa were largely used in Ayurveda, Unani and Siddha medicines. Chemical investigation on all three plants explore the presence of different types of active compounds like azadirachtin , nimbolinin, nimbin, nimbidin, nimbidol, sodium nimbinate, gedunin, salannin, and quercetin from Azadirachta indica, enzymes, minerals, sugars, lignin, saponins, salicylic acids, amino acids and vitamins like vitamins A (beta-carotene), C and E, vitamin B12, folic acid, and choline from Aloe vera and Cyaniding glycosides, Prostaglandins, quercetin, flavonoids, Sterols, Phenol compounds, Catechol and Protocatechuic acid from Allium cepa. This review explore the details of traditional use, phytochemicals and comparative studies of antioxidant and antidiabetic properties among lots of pharmacological properties of Azadirachta indica, Aloe vera and Allium cepa. Keywords: Azadirachta indica, Aloe vera, Allium cepa, Antidiabetic property, Quercetin.
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