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Title: The digestive protease and lipase in the house cricket Acheta domesticus
Authors: Teo, L.H. 
Woodring, J.P.
Keywords: Acheta
Issue Date: 1988
Citation: Teo, L.H.,Woodring, J.P. (1988). The digestive protease and lipase in the house cricket Acheta domesticus. Insect Biochemistry 18 (4) : 363-367. ScholarBank@NUS Repository.
Abstract: The optimal pH for digestive system protease was 7.6 and 8.0 for lipase. Protease activity increased from 20 to 45°C (50°C was inhibitory), but lipase activity peaked at 35°C. The activation energy for protease was 23,100 cal/mol and for lipase 18,000 cal/mol. The estimated 50% inhibition time at 50°C for protease was 62 min and 48 min for lipase. The estimated 50% inhibition concentration of mercuric chloride was 74 μM/l for lipase and 206 μM/l for protease. Five days of starvation caused a 74% decrease in total protease activity (quantity) and a 72% decrease in specific protease activity (activity/mg protein). Five days of starvation caused a 60% decrease in total lipase activity and only a 35% decrease in specific lipase activity. The caecal tissue is the major source of lipase and protease in the gut, but the large volume of the foregut crop contained the largest amount of lipase and protease which probably came from the caeca. © 1988.
Source Title: Insect Biochemistry
ISSN: 00201790
Appears in Collections:Staff Publications

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