Spectrophotometric determination of cyclization activity of .BETA.-cyclodextrin-forming cyclomaltodextrin glucanotransferase.
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概要
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A quick and reliable assay was developed to measure the cyclization activity of β-cyclodextrin-forming cyclomaltodextrin glucanotransferase. Beta-cyclodextrin formed in the reaction was measured directly in situ through as a complex with phenolphthalein. Using this assay, it was shown that the crude enzyme from an alkalophilic Bacillus sp. (ATCC 21783) showed cyclization activity with three distinct pH optima, at pH 4.5, 6.0 and 8.5. Soluble starch and maltohexaose were better substrates than other smaller maltooligosaccharides.
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