A highly stable raw starch digesting α-amylase from Nile tilapia (Oreochromis niloticus) viscera

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A raw starch digesting α-amylase from Nile tilapia (Oreochromis niloticus) intestine was identified. The α-amylase, AMY-T, had an estimated molecular weight of 60 kDa and purified to near homogeneity. AMY-T showed an apparent KM 4.78 mg/mL and Vmax 0.44 mg/mL/min) towards soluble starch. It was highly stable for 24 h in the pH range 3.0–10.0, and to solvents like methanol, isopropanol, butanol, dimethylformamide, DMSO and ethyl-ether. AMY-T was able to digest different carbohydrates, mainly showing endo-activity. Importantly, AMY-T was catalytically efficient and adsorbing towards raw potato starch at temperature documented for other raw starch digesting α-amylases. Thin layer and anion exchange chromatography characterization showed that the end products of raw starch hydrolysis were glucose, maltose and maltodextrins, with degree of polymerisation ranging 1–8. Scanning electron microscopy analysis of the AMY-T treated starch granules documented both granular exo- and endo-attack by AMY-T. These catalytic capabilities suggest high potential for AMY-T for industrial use.

Original languageEnglish
Article number129513
JournalFood Chemistry
Volume354
ISSN0308-8146
DOIs
Publication statusPublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

    Research areas

  • Amylase, Digestive enzymes, Fish processing waste, Starch, Starch hydrolysis

ID: 262965342