Ultrafine Grinding Improves the Dissolution Contends, Digestion and Absorption of Ca, Fe and Zn in Lentinula edodes Powders
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Abstract:
The dissolution amounts of Ca, Fe and Zn in the cover powder and stalk powder of Lentinula edodes, the bioavailability based on in vitro digestion model and the partition coefficient based on n-octanol absorption model were evaluated, and compared with the corresponding coarse powder (all 60 mesh). The results showed that the water dissolution rates of Ca, Fe and Zn and the soluble Ca contents were increased in the ultrafine powers from Lentinus edodes caps and stems (p<0.05). The soluble Fe contents in the ultrafine stems powers and the soluble Zn contents in the ultrafine cap powders were significantly higher than those in the corresponding crude powders. The dissolution contents of polysaccharide and protein-bound Ca, Fe and Zn were improved to some extents. The order of accessibility of the three elements in gastric and gastrointestinal digestive fluids in vitro was Zn > Ca > Fe. The average accessibility of Zn in the ultrafine caps and stems powers was 80.38% and 86.77%, respectively, and that of Ca was 56.41% and 61.41%, respectively, while that of Fe was 13.46% and 22.17%, respectively. In comparison with crude powders, ultrafine grinding powders resulted in signi?cant higher Ca and Zn accessibility ,and higher partition coefficients were observed for Ca, Fe, Zn from ultrafine stem powders powers and Ca, Zn from ultrafine cap powders powers (p<0.05). The results could be the basis of product development of Lentinula edodes and Ca, Fe, Zn intakes.