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. 2016 Oct 31;25(5):1413–1419. doi: 10.1007/s10068-016-0220-6

High-yield cycloamylose production from sweet potato starch using Pseudomonas isoamylase and Thermus aquaticus 4-α-glucanotransferase

Sun Chu 1, Jung Sun Hong 1, Shin-Joung Rho 1, Jiyoung Park 2, Sang-Ik Han 3, Young-Wan Kim 4, Yong-Ro Kim 1,✉
PMCID: PMC6049264  PMID: 30263424

Abstract

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.

Keywords: starch modification, enzymatic conversion, transglycosylation, debranching enzyme, normal starch

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