Characterization of the oil and other lipid components from mahogany (Swietenia macrophylla King) seeds

Date

10-1997

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Maxima E. Flavier

Abstract

Peñanor, Eileen L. College of Arts and Sciences, University of the Philippines at Los Banos. October, 1997. Characterization of the oil and other lipid components from mahogany (Swietenia macrophylla King) seeds.

Adviser: Dr. Maxima E. Flavier

The oil content of mahogany seeds was found to be in the range 52.0-59.1% (air-dry basis). The use of different solvents did not vary the amount of oil obtained. A slight decrease in the amount of oil was observed from the seeds that were stored for four months compared to the newly harvested seeds.

The physical and chemical characteristics of the oil namely specific gravity, saponification number, iodine number, free fatty acid number, peroxide value, and unsaponifiable matter were determined. Specific gravity of the oil from the stored seeds (0.8935-0.8962) was lower compared to the specific gravity of the oil from the newly harvested seeds (0.9174-0.9204). The iodine values (99.9-103.5) and saponification numbers (190.7-194.1) indicated the presence of mostly unsaturated and long chain fatty acids, respectively. Peroxide values were low while that of the free fatty acid numbers were high. A very slight difference in the unsaponifiable matter content was observed with the use of different solvent.

The predominant fatty acids were linoleic (31.4-31.95%) and oleic (30.19-30.27%). Other fatty acids were stearic (12.49-3.55%), palmitic (12.37-12.48%), linolenic (11.71-11.8%) and a small percentage of an unidentified fatty acid (0.70-0.99%) which was eluted after linolenic.

The UV spectrum of the residual oil obtained from the multiple solvent extraction showed the possible presence of oxidized fatty acids while the absorption band exhibited from the crude oil extract could be due to the olefinic or carboxyl group in the glyceride molecules.

Infrared and ultraviolet spectra of the unknown brown solid revealed the presence of acid, ester and olefinic groups.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1997 C4 P46

Document Type

Thesis

This document is currently not available here.

Share

COinS