A study on the insecticidal property of the leaves of flame tree (Caesalpinia Pulcherrima (L.) Sw.)

Date of Publication

1984

Document Type

Master's Thesis

Degree Name

Master of Science in Teaching Major in Chemistry

Subject Categories

Chemistry

College

Br. Andrew Gonzalez FSC College of Education

Department/Unit

Science Education

Thesis Adviser

Luzvisminda Rivero

Defense Panel Chair

Wyona Patalinghug

Defense Panel Member

Cecilia Flores
Consolacion Ragasa

Abstract/Summary

The insecticidal activity of the crude extracts prepared by successive extraction of the leaves of flame tree (Caesalpinia pulcherrima (L.) Sw.) in petroleum ether, acetone, methanol, and water was tested on cockroaches. Of the four crude extracts tested, petroleum ether, methanol, and acetone crude extracts were found to have considerable insecticidal properties. The petroleum ether crude extract was found to be the most toxic on cockroaches and was subsequently analyzed to isolate the insecticidal fractions which may be responsible for the activity. The interphase extractions of the organic components in the petroleum ether crude extract after chlorophyll was precipitated were done using two solvents petroleum ether and chloroform. The resulting semi-purified extracts were still toxic when tested on cockroaches. Partial isolation of the components of the semi-purified extract from petroleum ether was attained by flash chromatography. The components of the semi-purified extract from chloroform were isolated by column chromatography and were labeled as Fraction A, B, C, and D. Toxicity test result of the fraction showed that Fraction C gave the highest percentage mortality. Preliminary characterization of Fraction C by NMR spectroscopy indicated the presence of hydrocarbons, i.e. -CH2 and -CH3 groups as shown by the peaks at high field, atLof around 0.90 ppm.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG01243

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

59 leaves; 28 cm.

Keywords

Insecticidal plants; Pride-of-Barbados (Plant)

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