Evaluation of a glucose oxidase



Title Evaluation of a glucose oxidase
Author(s) Shelley A. Burton, A. L. MacKenzie, T. Jeffery Davidson, A. C. Fraser
Journal Journal of Shellfish Research
Date 2000
Volume 19
Issue 2
Start page 841
End page 844
Abstract A colorimetric method for indirect measurement of glycogen concentrations in tissue homogenates of eastern oysters (Crassostrea virginica) was evaluated. This method uses a conversion of glycogen to glucose by amyloglucosidase. The procedure was optimized Fur extracting buffer pH (5.0) and amyloglucosidase concentration (5 mg/mL). Coefficients of variation(n = 10) for oyster homogenates with mean glycogen concentrations of 84 and 242 mg/dL had within-run Values of 3.29 and 3.66%, and between-run results of 4.46 and 3.15%, respectively. When mean glycogen concentrations of thawed oyster homogenates were compared with those of initial fresh homogenates, no significant (P less than or equal to 0.05) differences were detected in samples thawed after 1 h, 1 day, 1 wk, or 1 mo. Glycogen recovery percentages of 104.1, 103.7, and 104.5% were obtained with mixed solutions containing 111, 94, and 19 mg/dL glycogen, respectively. The lower limit of sensitivity for the procedure was approximately 14 mL/dL. The assay was considered to be linear to 436 mg/dL. Lyophilized samples appeared to provide the most reliable determination of glycogen concentrations per gram of tissue by avoiding variable water content in oyster tissues. Initial laboratory ranges for tissue glycogen based on wet (mean +/- 2 SD: 7-43 mg/g) and dry (mean +/- 2 SD: 19-145 mg/g) weights were determined with 49 second-year growth oysters obtained during July 1998 (Covehead, Prince Edward Island, Canada). It was concluded that the colorimetric assay offered a reliable indication of tissue concentrations of glycogen in eastern oysters (C. virginica).
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