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 C. Patalinghug

Defense Panel Member

Consolacion Y. Ragasa
Cecile Flores

Abstract/Summary

The insecticidal properties of the crude extracts of the barks of Caesalpinia pulcherrima (L) SW. were tested on cockroaches of almost the same sizes. Successive extractions were done using hexane, acetone, methanol and water as solvents. The hexane crude extract revealed the highest percentage mortality using Abbott's formula (1925). Thin layer chromatographic analysis of the crude extracts was monitored using acetone, methanol, acetone in petroleum ether and methanol in acetone as developing solvents. Pure acetone, pure methanol and combinations of 30 percent acetone in petroleum ether and 20 percent acetone in methanol did not give good results of separation but 2 percent acetone in petroleum ether was efficient in separating the components of the crude extracts. The active components of the hexane extract were separated and isolated by quick column chromatography. The fraction with a single component, as shown by TLC runs using a 2:8 acetone in petroleum ether as developing solvent was further characterized through infrared and nuclear magnetic resonance spectroscopy. The spectra of the crude residue showed that the active component is most probably a long chain hydrocarbon with isolated double bonds.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

TG01297

Shelf Location

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

Physical Description

37 leaves; 28 cm.

Keywords

Insecticidal plants; Pride-of-Barbados (Plant)

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