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Chemical and Physical Properties of Kiwifruit (Actinidia deliciosa) Starch

Stevenson, David G., Johnson, Scott R., Jane, Jay-lin, Inglett, George E.
Stärke = 2006 v.58 no.7 pp. 323-329
enthalpy, starch granules, X-ray diffraction, amylose, viscosity, amylopectin, glass transition temperature, melting point, pasting properties, molecular weight, kiwifruit, Actinidia deliciosa, gelatinization
Chemical and physical properties of kiwifruit (Actinidia deliciosa var. Hayward) starch were studied. Kiwifruit starch granules were compound, irregular or dome-shaped with diameters predominantly 4-5 µm or 7-9 µm. Kiwifruit starch exhibited B-type X-ray diffraction pattern, an apparent amylose content of 43.1% and absolute amylose content of 18.8%. Kiwifruit amylopectins, relative to other starches, had low weight-average molecular weight (7.4x10⁷), and gyration radius (200 nm). Average amylopectin branch chain-length was long (DP 28.6). Onset and peak gelatinization temperatures were 68.9°C and 73.0°C, respectively, and gelatinization enthalpy was high (18.5 J/g). Amylose-lipid thermal transition was observed. Starch retrograded for 7 d at 4°C had a very high peak melting temperature (60.7°C). Peak (250 RVU), final (238 RVU) and setback (94 RVU) viscosity of 8% kiwifruit starch paste was high relative to other starches and pasting temperature (69.7°C) was marginally higher than onset gelatinization temperature. High paste viscosities and low pasting temperature could give kiwifruit starch some advantages over many cereal starches.