Determination of the effect on the oxidative stability of Jathropha methyl ester using methanolic extract of banaba (Lagerstroemia speciosa) leaves

Date

7-2010

Degree

Bachelor of Science in Chemical Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Jovita L. Movillon

Committee Member

Rex B. Demafelis, Ramer P. Bautista

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Abstract

The effect of adding antioxidant from the methanolic extract of banaba leaves on the oxidative stability of Jatropha methyl ester was investigated in this study. Different extraction time were employed to determine the most suitable duration of extracting antioxidant, specifically total polyphenol, in the banaba leaves. Folin ciocalteu assay for phenolic content was used for analyzing 6, 12, 18, and 24 hour extraction time in duplicates. The mean absorbance readings were 2.6905, 2.900, 2.9150, and 2.9175 for 6, 12, 18, and 24- hour soaking time, respectively. It was found out that the most appropriate extraction time was 6 hours since there was no significant difference between the values of absorbance after one way analysis of variance (ANOVA) was performed. Different loading of 2604.22, 3472.30, 4340.37, 3986.06, 6643.43, and 15625.35 ppm of antioxidant from banaba leaves extract into 200ml of Jatropha methyl ester was also done to find out its effect on the oxidative stability of the biodiesel. Rancimat method for analysis of oil stability index was conducted to determine the induction period of the samples. The values of induction period obtained were 3.92, 0.99, 1.50, 3.54, 0.41, and 11.13 hours for 2604.22, 3472.30, 4340.37, 3986.06, 6643.43, and 15625.35 ppm, respectively. These data have a regression coefficient of 0.687 which statistically indicate a linear positive relation. Different loading rates of commercial antioxidant (Baynox Plus) were also performed to compare the viability of the banaba antioxidant with the commercially used antioxidant in the market. Loadings of 1250, 1667, and 1923 ppm of Baynox Plus showed induction period of 3.55, 4.56, and 6.17 hours, respectively. Compared to banaba antioxidant, Baynox Plus has a very strong positive linear relation,with regression coefficient equal to 0.929. However, it was found out that for a 100L biodiesel, the cost of Baynox Plus reached Php 192.78, which is basically more expensive than banaba antioxidant with Php 191.9785.

Language

English

Location

UPLB Main Library Special Collections Section

Document Type

Thesis

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