Nutritional, phytochemical and antioxidant activity of Gumamela (Hibiscus Rosa-sinesis var, Gelia Castillo) leaves

Date

7-2015

Degree

Bachelor of Science in Food Technology

Major Course

Major in Food Science

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Jelynne P. Tamayo

Abstract

Hibiscus-rosa sinensis var. Gelia Castillo is one of the UPLB Millenium Hybrid Series that IPB released and is known as an ornamental plant yet having potential health benefits. Proximate analysis using standard methods showed that oven-dried leaves contain 15.30% moisture, 8.54% ash, 3.40% crude fat, 10.73% crude fiber, 15.13% crude protein and 46.90 nitrogen-free extracts. The presence of phytochemicals such as phenol, flavonoids, saponins, tannins, diterpenes, cardiac glycosides and alkaloid were detected in the ethanolic extract of the leaves while alkaloid, saponins, diterpenes, tannins, and phenols were present in the aqueous extract. The phytochemical content of the ethanolic extract was quantified: phenolics and flavonoids were quantified using UV-vis spectrophotometry, 4.45mgGAE/g extract and 6.55mgQE/g extract, respectively while saponin (28.23%) and alkaloid (3.13%) content was determined by gravimetric method. The antioxidant activity of the ethanolic extract was also determined using DPPH Radical Scavenging Assay and was observed that the higher the concentration of extract, the higher the scavenging activity.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2015 F61 /M37

Document Type

Thesis

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