Abstract:
:Three bacterial glycogen branching enzymes (GBEs) having different branching characteristics were used to produce clustered amylopectin (CAP), and structure and functional properties of CAPs were intensively analyzed. Branch distributions of three CAPs varied from very short (DPn = 6.65) to medium (DPn = 14.1). Branch distribution showed profound correlation with hydrodynamic diameter, water solubility, digestibility, and effects on mice gut-microbiota. All the CAPs showed nearly no viscosity and retrogradation. The very short-branch CAP exhibited more than 100-fold water-solubility, 3.5-fold lower α-amylase catalytic efficiency, and 27% lower digestibility in small intestine-mimicking condition than amylopectin. Intriguingly, medium branch CAP had 1.8-fold larger hydrodynamic diameter than the very short one. Mice gut-microbiota composition statistically varied after 12-day feeding of the CAPs, but only the medium chain CAP brought clear positive changes on the gut-microbiota. Consequently, slowly digestible starch was successfully synthesized by the single GBE, but the CAP structure affects in vivo functions in complicated manner.
journal_name
Food Chemjournal_title
Food chemistryauthors
Jung D,Tran PL,Yim CS,Park EJ,Yeom SJ,Jung HG,Nguyen TTH,Kim D,Park JTdoi
10.1016/j.foodchem.2019.125972subject
Has Abstractpub_date
2020-05-01 00:00:00pages
125972eissn
0308-8146issn
1873-7072pii
S0308-8146(19)32115-6journal_volume
311pub_type
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