Abstract
The antioxidant potential, antiglycation, and total phenolic content of essential oils (EOs) extracted from 19 medicinal plants were assessed. The variation in yield of the EOs with respect to altitude and season was also studied. The antioxidant potential of Pimenta dioica (L.) Merr., Psiadia terebinthina A.J. Scott, Laurus nobilis L., Piper betle L., and Citrus hystrix DC. showed IC50 values less/equivalent to the positive controls. Weak correlations were observed between the 1,1-diphenyl-2-picryl hydrazyl (DPPH) and xanthine oxidase (XO) assays as well as between the DPPH and nitric oxide radical scavenging (NO) assay and between the XO and 2,2 azinobis (3-ethylbenzothiazoline-6 sulphonic acid (ABTS) assay. Cupressus macrocarpa Hartw., L. nobilis, Cinnamomum zeylanicum Nees, and Psidium guajava L. successfully inhibited in vitro glycated end-products (IC50: 451.53 ± 3.00, 387.04 ± 1.53, 348.59 ± 3.34 and 401.48 ± 2.86 µg/mL respectively) compared to aminoguanidine (IC50: 546.69 ± 3.57 µg/mL). Some of the EOs had a high content of phenolic compounds. EOs such as P. dioica, P. terebinthina, L. nobilis, P. guajava, and C. hystrix were found to be rich in eugenol and other phenolic compounds. The EOs evaluated in the present study may have applications in the nutraceutical and pharmaceutical industries.
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