Cereal starches were extracted at 100°C with various proportions of lower alcohols and water to establish optimum conditions. Lipid yields generally exceeding 90% were obtained with one two‐hour extraction of maize starch at 100°C when using not less than 14 ml of 75–85% methanol, 10 ml of 75% ethanol, 12 ml of 74–78% n ‐propanol, 14 ml of 74–78% iso propanol, or 17 ml of 84% n ‐butanol per gram of starch. Similar results were obtained with wheat A‐starch ( > 8 μm granule diameter), wheat B‐starch ( < 8 μm granule diameter) and rice starch using n ‐propanol‐water, and with rice starch using methanol‐water. Yields decreased if the proportions of alcohol and water were not kept within well‐defined limits, especially with butanol and ethanol. The preferred conditions for complete recovery of lipids were two 2‐hour extractions and one 1‐hour extraction at 100°C with not less than 16 ml of 75% n ‐propanol per gram of starch.
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Morrison et al. (1985) studied this question.