Glutamate receptor inhibitor

Claim 1

An insecticidally effective composition comprising a glutamate receptor inhibitor, said glutamate receptor inhibitor having insecticidal properties when present in a concentration of at least 10 -9 M, said glutamate receptor inhibitor possessing only one single spot at the position of Rf value of substantially 0.20 on a Silica gel 60 thin-layer plate developed with phenol-water mixed solvent 3:1 (V/V), said glutamate receptor inhibitor being an organic compound obtained from Joro spider venom glands and which has the following properties: (a) molecular weight is within the range of 500±200; (b) it is substantially insoluble in ethyl acetate and soluble in water; (c) the activity remains unchanged when heated to 80° C. for 20 minutes in water; (d) the activity remains unchanged when heated to 80° C. for 20 minutes in 0.4 M perchloric acid; (e) it shows in electrophoresis neutral electric charge with use of 0.01 M phosphate buffer (pH 7) and positive electric charge using 0.2 M formate buffer (pH 2.25); (f) it develops color with ninhydrin and fluoresces with fluorescamine; (g) it shows maximum absorption substantially at 270 nm, and minimum absorption substantially at 245 nm in water (pH 6.1).