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Microscopic structure of sweet potato starch granules treated with HHP for 10 min at various conditions: 200 MPa, 60 °C (a); 200 MPa, 70 °C (b); 500 MPa, 60 °C (c); and 500 MPa, 70 °C (d). Controls include untreated samples (e) and thermal treatment at 80 °C under atmospheric pressure (f). Starch stained with iodine solution. Bars = 50 μm [9] (Copyright 2017, Elsevier).
