Abstract
Steryl esters of ferulic and p-coumaric acids were tested for their effect on corn fungal pathogens and insects. The steryl ester fraction from corn bran had no effect on corn earworm larvae or driedfruit beetle adults, but driedfruit beetle larvae showed a significant increase in weight and the triglyceride fraction was active. Bioassays of pure ferulate esters and the ester fraction from both corn and rice showed no appreciable effect at 100 ppm on spore germination or germ tube growth of Aspergillus flavus, Fusarium moniliforme, or Diplodia maydis. Sclerotinia sclerotiorum was inhibited 75−90% by the total steryl ester fraction from corn and approximately 50% by the ester fraction from rice bran oil. Stigmastanyl and campestanyl ferulate showed little or no inhibition. The steryl ester fraction increased aflatoxin B1 level in A. flavus NRRL 6536 significantly at 0.33 and 1.0 mg/mL. However, the esters had no effect on A. flavus NRRL 3357. The steryl ferulate and p-coumarate ester fraction from corn was...
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