Variability of antioxidant activity in Ivy Gourd, Coccina grandis (L.) Voigt.

Date

4-2003

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

The total phenolics content, ascorbic acid (AsA) content, and antioxidant activity (AoA) in male, and female young shoot samples from 39 ivy gourd (Coccinia grandis (L.) Voigt) accessions at the Asian Vegetable Research and Development Center (AVRDC) were assessed. The total phenolics content (mg chlorogenic acid equivalent/100 g FW) ranged from 286.4 to 530.3 in males, with a mean of 404.4, and 291.9 to 510.3 in females, with a mean of 385.6. Ascorbic acid content (mg/100 g FW) in males ranged from 44.4 to 86.3, with a mean of 57.3, and 37.4 to 74.5 in females, with a mean of 50.7 mg/l00 g FW. Antioxidant activity (% antioxidation relative to 10mM BHA) ranged from 89.4% to 102.0% in males, with a mean of 94.2%, and 80.9 % to 95.8% in females, with a mean of 90.1%. These ranges seem to indicate the presence of considerable variability in total phenolics content, AsA content, and AoA among the accessions, which may have been due to genotypic differences, environmental growing conditions, and maturity. Differences between male and female plants in phenolic contents were not significant (p > 0.05). AsA content was significantly different between males and females (p < 0.05). Antioxidant activity between the male and female plants was also significant (p < 0.01). These suggest that sexual dimorphism in ivy gourd has no effect on total phenolic contents, but affects ascorbic acid content as well as the levels of antioxidant(s) other than phenolics that are responsible for the observed AoA. Correlation was weakly positive between AoA and total phenolics (0.397 in males, 0.387 in females) and weak to moderate positive between AoA and AsA (0.554 for males, 0.381 for the females), suggesting that total phenolics or AsA cannot account for the observed antioxidant activity of ivy gourd.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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