Effect of heat treatment on solubility of copper and zinc in grasses
1997
Nakasone, K. (Kagoshima Univ. (Japan)) | Nagasaki, Y. | Kawamoto, Y. | Furuta, K.
Effect of heat treatment on solubility of copper (Cu) and zinc (Zn) against 1 normal hydrochloric acid solution were investigated on guineagrass (Panicum maximum var. maximum Jacq. cv. Gatton). These grinded samples were incubated at 20, 40, 60, and 80 degrees C for 1-6 days, after adjusted to 30-50% of moisture content, respectively. Two grass species of guineagrass and Italian ryegrass (Lolium multiflorum Lam. cv. Sakurawase) were also treated at 70 degrees C, for 48 hours in the same way described above and examined on distributions of these minerals among cell wall constituents. After each sample was divided into some fractions using enzymatic analysis method, Cu and Zn contents in the lower digestible fraction were measured. The results were as follows: 1. the release ratio of Cu was decreased as the temperature and time increased, while decreased release ratio of Zn was only observed at 80 degrees C. 2. Cu and Zn contents in lower digestible fraction of cell wall constituents were increased with heat treatment. Thus, decreased solubility of Cu and Zn in forage against the 1 normal hydrochloric acid extraction method was considered as a result of increased bindings of these minerals with lower cell wall constituents
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