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Case Study Amylase Activity In The Midgut Homogenate of The Palm Weevil, Rhynchophorus phoenicis F. (Coleoptera: Curculionidae)

Palm weevil, Rhynchophorus phoenicis F. is a notorious principal pest of palm trees and sugar cane in the tropics and subtropical regions of the world where it causes great economic losses. The midgut of the larva and adult stages of this insect are rich in digestive enzymes. Amylase, being one of the most important carbohydrases was investigated in the midguts of the larva and adult stages of the insect using dinitrosalicylic acid reagent method. The optimum condition for amylase bioassay in the midgut of the larva of R. phoenicis involved 2 ml of 1% starch, 2 ml of phosphate buffer (pH 4.0), 1 ml of enzyme extract incubated at optimum temperature of 40 o C while pH 4.5 and 45 o C were optimal for amylase activity in the adult weevil. MichaelisMenten constants (Km) of 1.82 mg/ml and 2.13 mg/ml were obtained for the larva and adult midgut amylases respectively.