Oliveira HM, Pinheiro AQ, Fonseca AJM, Cabrita ARJ, Maia MRG. Flexible and expeditious assay for quantitative monitoring of alpha-amylase and amyloglucosidase activities.
MethodsX 2019;
6:246-258. [PMID:
30792966 PMCID:
PMC6370546 DOI:
10.1016/j.mex.2019.01.007]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 01/13/2019] [Indexed: 11/27/2022] Open
Abstract
The monitoring of the activity of alpha-amylase and amyloglucosidase is an important tool for studying their role in the hydrolysis of starch. Here we introduced an improved method capable to measure the activity of alpha-amylase and amyloglucosidase from different sources based on a quantitative starch-iodine assay. The developments of the assay sought the consistent preparation of the reagents, the rescale of the assay and the adjustment of the sensitivity. This was complemented by a glucose yield assay for amyloglucosidase that allowed a secondary source of information when insoluble starches were studied. The proposed method showed high precision in long-term use (RSD < 6.3%). Furthermore, all experimental conditions can be adapted according to the equipment available at each laboratory, transforming this method in a broadband analytical tool for screening alpha-amylase and amyloglucosidase activities.
Tailorable assay based on the starch-iodine staining for the determination of alpha-amylase and amyloglucosidase activities.
Enhanced consistence of reagent preparation.
High intra-day and inter-day reproducibility.
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