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Extraction of starch from hulled and hull-less barley with papain and aqueous sodium hydroxide

Abstract

Starch was isolated from hulled (VJM 201) and hull-less (BL 134) barley with papain and aqueous sodium hydroxide treatments. For enzyme-assisted extraction, barley was steeped in water containing 0.2 % SO2 + 0.55 % lactic acid at 50° ± 2 °C for 4–5 h. The slurry was mixed with 0.4–2.0 g papain/kg barley and incubated at 50° ± 2 °C for 1–5 h. Aqueous sodium hydroxide (0.01–0.05 M) was added to the finely ground barley meal. The alkaline slurry was incubated at ambient temperature (25° ± 2 °C) for 15–60 min. The starch and grain fractions were isolated by screening and centrifugation. Increases in the time of treatment significantly affected the fiber, centrifugation and non-starch residue losses. Concentration of papain and sodium hydroxide had negligible effect on extraction losses. The enzyme-assisted extraction efficiency of starch was higher (80.7–84.6 %) than the alkaline method (70.9–83.7 %). The hulled barley showed higher extraction efficiency than the hull-less barley. The slurry treated with 0.4 g papain/kg barley for 5 h and 0.03 M sodium hydroxide for 60 min produced maximal yield of starch. Barley starch showed desirably high pasting temperature, water binding capacity and hold viscosity; and low final and setback viscosity compared with the commercial corn starch. The alkaline extracted hull-less barley starch showed exceptionally high peak and hold viscosities

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Correspondence to S. Tejinder.

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Sharma, P., Tejinder, S. Extraction of starch from hulled and hull-less barley with papain and aqueous sodium hydroxide. J Food Sci Technol 51, 3870–3877 (2014). https://doi.org/10.1007/s13197-013-0924-z

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Keywords

  • Barley
  • Starch
  • Enzyme-assisted extraction
  • Alkaline extraction