Synthesis and evaluation of sucrose esters as crop protection agents

Date

6-2001

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Evelyn B. Rodriguez

Abstract

The sucrose esters were prepared by the reaction of sucrose and the acid chlorides of fatty acids of different chain lengths, namely, caproic acid (hexanoic acid), caprylic acid (octanoic acid), myristic acid (decanoic acid), and lauric acid (dodecanoic acid). The esteritication reactions used a 2.25:1 molar ratio of acid chloride to sucrose and were carried out under specially developed conditions to maximize the formation of diacyl sucrose esters. Thin-layer chromatograpic analysis of the acetylated octanoyl sucrose esters showed that mono-, di-, tri- and tertraacyl sucrose esters were present and the diacyl sucrose ester was the major product. The sucrose esters were tested for their aphicidal activity against corn aphid (Rhophalusiphunt maidis) and molluscicidal activity against the golden snail (P.canaliculata). The aphid bioassay showed that at 1000 ppm all the sucrose esters caused 100.0% mortality, except for the dodecanoyl sucrose ester, which caused 85.0% mortality. The total hexanoyl sucrose esters was the most active which caused 100.0% mortality down to 500 ppm, while octanoyl, decanoyl and dodecanoyl sucrose esters caused 93.3%, 91.7%, and 70.0% mortality respectively, at the same concentration. In the preliminary molluscicidal bioassay, all sucrose esters caused 100.0% mortality from 500ppm to 20 ppm. The dodecanoyl sucrose esters exhibited the highest activity, which caused 100.0% mortality down to 10 ppm. While hexanoyl, octanoyl, and decanoyl sucrose esters caused only 50.0% mortality at 10 ppm. Dodec,anoyl sucrose ester, having the highest activity against P. canaliculata, was further assayed using a greater population of snails. The bioassay showed that dodecanoyl sucrose ester caused 100.0% mortality at 20 ppm and 65.0% mortality at 10 ppm.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2001 C4 M36

Document Type

Thesis

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