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KMID : 1007520160250051413
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Food Science and Biotechnology
2016 Volume.25 No. 5 p.1413 ~ p.1419
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High-yield cycloamylose production from sweet potato starch using Pseudomonas isoamylase and Thermus aquaticus 4-α-glucanotransferase
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Chu Sun
Hong Jung-Sun
Rho Shin-Joung
Kim Yong-Ro
Park Ji-Young
Han Sang-Ik
Kim Young-Wan
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Abstract
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An optimal reaction condition for producing cycloamylose (CA) from sweet potato starch was investigated using a combination of isoamylase (from Pseudomonas sp.) and 4-α-glucanotransferase (from Thermus aquaticus, TAαGT). Starch was debranched by isoamylase for 8 h and subsequently reacted with TAαGT for 12 h. The yield and purity of CA products were determined using HPSEC and MALDI-TOFMS, respectively. Consequently, the maximum yield was 48.56%, exhibiting the highest CA production efficiency ever reported from starch. The CA products showed a wide range of the degree of polymerization (DP) with the minimum DP of 5. CA was also produced by simultaneous treatment of isoamylase and TAαGT. The yield was 3.31%, and the final products were contaminated by multiple branched and linear molecules. This result suggests that a former reaction condition (the sequential addition of isoamylase and TAαGT) is preferable for producing CA from sweet potato starch.
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