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- W2052219571 abstract "The authors aim to establish a method that can quantitatively evaluate vital reactions to stress. We have been examining the correlation between stress and salivary amylase activity in order to verify its validity as a stress index. In order to quantify human stress, which changes over time, the relationship between stress and salivary amylase activity must be verified by fast and repeated analysis of salivary amylase activity. Standard biosensors are designed such that the enzyme immobilized on an electrode (enzyme electrode) and the substrate-dependent activity is measured. The reverse approach of measuring the alpha-amylase-dependent activity was adopted. We fabricated an amylase activity analytical system. Maltopentaose was selected as a substrate for alpha-amylase and a flow-injection-type device was used to supply maltopentaose continuously. alpha-Glucosidase, having relatively low enzyme activity, was immobilized on a pre-activated membrane so that it could be enclosed in a pre-column, Glucose oxidase, having higher enzyme activity, was immobilized on a working electrode so that it could function as an amperometric biosensor. A saliva-collecting device was fabricated to make saliva pretreatment unnecessary. As a result, an amylase activity analytical system was fabricated that enabled us to measure salivary amylase activity from 0 to 30 kU/l, with an R(2) value of 0.97. The time-course changes in the salivary amylase activities for 1 week were 5.1%, and the initial sensitivity remained nearly constant. Through this study, we were able to verify the possible development of the amylase activity analytical system." @default.
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- W2052219571 date "2003-05-01" @default.
- W2052219571 modified "2023-09-27" @default.
- W2052219571 title "Flow-injection-type biosensor system for salivary amylase activity" @default.
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- W2052219571 doi "https://doi.org/10.1016/s0956-5663(03)00007-1" @default.
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