Changes in composition and thermal transition temperatures of grain sorghum wax during storage
نویسندگان
چکیده
Grain sorghum (Sorghum bicolor) wax is composed mainly of aldehydes, alcohols, and acids. Aldehydes, comprising about one-half of the wax, are readily converted to acids in presence of air. In this study, whole sorghum wax and an aldehyde fraction from sorghum wax were subjected to oxidative conditions. Changes in the major components and thermal transition temperatures were determined using HPLC and differential scanning calorimeter (DSC), respectively. The aldehyde fraction was oxidized markedly to acids over 4 months in storage at room temperature. Acid content, in the fraction, was initially 5–7% and increased to 42– 51% after 135 days in storage. Consequently, thermal transition apex and end temperatures of the fraction, which were initially 73–74 and 76–77 °C, respectively, increased to 80–81 and 83–85 °C, respectively, after 135 days. Whole sorghum wax, composed initially of 55% aldehydes, 37% alcohols, and 7% acids, slightly increased acid level to 8–12% during storage over 5 months under various conditions. Thermal transition temperatures of the wax changed little over all storage conditions during 5 months of storage with 83–84 °C for apex temperatures and 86–87 °C for end temperatures.
منابع مشابه
Policosanol Contents and Composition of Grain Sorghum Kernels and Dried Distillers Grains
Cereal Chern. 81(3):345-349 Grain sorghum can be a major source of policosanols, long-chained alcohols, that have beneficial physiological activities. Sorghum dried distillers grains (DDG), a by-product of ethanol production from grain sorghum. contain a large amount of policosanols. Content and composition of policosanols in long-chained lipids extracted from grain sorghum kernels and DDG were...
متن کاملPolicosanol Contents and Compositions in Wax-Like Materials Extracted from Selected Cereals of Korean Origin
Cereal Chern. 82(3):242-245 Policosanols. long-chained alcohols. have been reported to have beneficial physiological activities. Content and composition of policosanols in wax-like materials extracted from selected cereals of Korean origin were determined. Wax-like materials were extracted using hot hexane. Yields of wax-like materials from unpolished grain sorghum, polished grain sorghum. brow...
متن کاملEnvironmentally-induced changes in protein composition in developing grains of wheat are related to changes in total protein content.
Nitrogen (N) nutrition, post-anthesis temperature and drought-induced changes in the kinetics of accumulation of dry mass, total grain N and protein fractions (albumins-globulins, amphiphils, gliadins, and glutenins) contents were examined for winter wheat (Triticum aestivum L.). Crops were grown in controlled environment tunnels in 1994 and 1998. In 1994, five post-anthesis temperatures averag...
متن کاملEffects of substituting sorghum grain for barley on milk yield and composition of dairy cows
متن کامل
Effect of Gamma, Electron Beam and Infrared Radiation Treatment on the Nutritional Value and Anti-Nutritional Factors of Sorghum Grain
The present study describes the radiation-induced effects on nutritional quality and on anti-nutritional factors of sorghum grain: effects of electron beam (ER) and gamma irradiation (GR) at doses of 10, 20 and 30 kGy and infrared irradiation (IR) at 60, 90 and 120 s on the chemical composition, mineral content and bioavailability, in vitro protein and starch digestibility, total phenolic compo...
متن کامل