Deterioration during storage in wild rice, Zizania palustris, and polished basmati rice, Oryza sativa, and potential for insect infestation
1996
White, N.D.G. (Agriculture and Agri-Food Canada, Winnipeg (Canada). Research Centre) | Jayas, D.S.
Wild rice, Zizania palustris, and long-grain polished Basmati rice, Oryza sativa, have significantly different moisture content/relative humidity equilibria even though oil content of both seeds, which affects grain moisture content (MC), is low at 1 %, wt:wt. Seeds in storage are occasionally exposed to high relative humidities, but since microflora cannot grow at 65 % relative humidity (RH), wild rice could be stored for 12 months at 10 deg C and 10.5 % MC, 20 deg C and 10.5 % MC, 30 deg C and 10 % MC or 40 deg C and 9.2 % MC; polished Basmati rice can be safely stored at 10 deg C and 14.4 % MC, 20 deg C and 14.0 % MC, 30 deg C and 12.5 % MC, and 40 deg C and 12.2 % MC. The low levels of oils resulted in negligible changes in fat acidity values during 12 months of storage even at high temperature and relative humidity as opposed to cereals and oilseeds with higher oil contents. Microfloral infection was initially low although more extensive on wild rice than polished Basmati rice. Whole Basmati rice can be attacked by a wider range of storage insects than whole wild rice. Insect infestation of wild rice can be potentially severe during storage in heated homes and warehouses
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