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Updated: Feb 3, 2026

Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
Banana starch and molecular shear fragmentation dramatically increase structurally driven slowly digestible starch in
Laura Roman1, Manuel Gomez2, Bruce R Hamaker3
1Food Technology Area, College of Agricultural Engineering, University of Valladolid, 34004 Palencia, Spain; Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, IN 47907, USA.
Abstract:
The role of native (NB) and extruded (EB) banana starch, and a 1:1 native:extruded banana starch composite (MB), in slowing down the starch digestibility of bread crumb and crust was investigated. During extrusion, the molecular weight of banana starch was reduced from 2.75 × 108 to 4.48 × 106 g/mol (HPSEC-MALS-RI). Results showed a slowly digestible starch (SDS) increase from 1.09% (control) to 4.2, 6.6, and 7.76% in NB, MB and EB crumbs (fully gelatinized), respectively. DSC data attributed this occurrence to the formation of supramolecular structures upon storage involving amylopectin branches (especially those from fragmented amylopectin in EB). The hedonic sensory test showed no differences in overall liking between MB, EB and control, validating feasibility of including banana in the formulation. For the first time, this study shows a molecular size reduction as a strategy to manufacture selected starches that result in highly gelatinized baked products rich in structurally driven SDS.
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