Insecticidal Components from Luyang Dilaw, Curcuma longa L.: Antifeedants to Crocidolomia binotalis Zeller

Professorial Chair Lecture

UPLB Alumni Association Professorial Chair Lecture

Place

Room B309, Institute of Chemistry, College of Arts and Sciences, UPLB, College, Laguna

Date

6-3-2003

Abstract

Dichloromethane (DCM) extract from dried ground rhizomes of Philippine Curcuma longa L. was evaluated for its insecticidal activity against 2nd and 3rd instar larvae, but did not exhibit ovicidal toxicity and larval contact toxicity.

The DCM chromatographic fractions (F1-F4) were evaluated for its antifeedant activity against the more sensitive 2nd istar CM larvae using the 'no choice' method. Fractions 1 and 2 had high antifeedant activity and toxicity leading to 100% mortality 12 hours and 36 hours after exposure to the treated pechay leaf disks, respectively. Both F3 and F4 showed high antifeedant activity.

GC-MS analysis showed that F1 contains one major component (C1) with a molecular mass of 216 amu. FT-IR analysis of C1 indicated the presence of benzenoid and alkene groups.

Isolation of the major components of F2 yielded three oils, designated as C2, C3 and C4.

Infrared analysis showed that C2 has a a,B-saturated ketone, benzenoid and alkene groups; C3 contains benzenoid and alkene groups; and C4 has ketone, benzenoid and alkene groups.

Components 5 and 6 (C5 and C6) were the major constituents of F3 and F4. C7 was found in F4/. Components 5, 6 and 7 are orange crystalline solids with MP (°C), 60-65, 55-60 and 205-210, respectively. Both C6 and C7 have ketone, alkene, benzenoid and probably hydroxy groups.

Location

UPLB Main Library Special Collections Section (USCS)

College

College of Arts and Sciences (CAS)

Language

English

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