Effect of cooking and irradiation on the labile vitamins and antinutrient content of a traditional African sorghum porridge and spinach relish

acide ascorbique acide phytique acido ascorbico acido fitico afrique du sud alimentos antinutritional factors ascorbic acid cooking cuisson espinaca facteur antinutritionnel factores antinutricionales foods irradiation nutritive value phytic acid produit alimentaire sorghum south africa spinach thiamin thiamine tiamina valeur nutritive valor nutritivo vitaminas vitamine vitamins