This article deals with the comparison of the antioxidant activity of aqueous extracts of various parts of Carica papaya L. The evaluation of total phenolic content and total flavonoid content revealed high antioxidant potential of the seeds and fruits. The free radical-scavenging potential of the aqueous extracts indicated the seeds to have better DPPH-scavenging activity than fruits. The results were augmented by the FRAP activity as well. The phenolics present in the extracts were separated and identified as 5-hydroxy feruloyl quinic acid, acetyl p-coumaryl quinic acid, quercetin-3-O-rhamnoside, syringic acid hexoside, 5-hydroxy caffeic quinic acid, peonidin-3-O-glucoside, sinapic acid-O-hexoside, cyaniding-3-O-glucose and methyl feruloyl glycoside by LCMS-MS technique.
a B S t r a c t Papaya (Carica papaya linn.) is commonly known for its food and nutritional values throughout the world. the medicinal properties of papaya fruit and other parts of the plant are also well known in traditional system of medicine. During the last few decades considerable progress has been achieved regarding the biological activity and medicinal application of papaya and now it is considered as valuable nutraceutical fruit plant. the present study deals with the microscopic evaluation of leaves of Carica papaya linn., to establish the salient diagnostic features for the leaf. the leaf shows abundant sphaeraphides and rhomboidal calcium oxalate crystals. the leaf shows no trichomes. Micromorphological studies conducted on the leaf gave value of stomatal index to be 31.56 ± 3.41, vein termination number 3-4, and palisade ratio to be 12.65 ± 1.57. the leaf shows a continuous network of veins. Histochemical tests performed indicate the presence of alkaloids and starch. Powder study shows the presence of sphaeraphides, starch grains and rhomboidal calcium oxalate crystals, apart from regular characters such as stomata and spiral xylem. Physicochemical parameters such as extractive values, ash values and moisture content have also been studied for the leaf. the results of this study could be useful in setting some diag nostic indices for identification, authentication and preparation of the monograph of the plant.
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