Abstract: jujube was used as raw material to prepare jujube powder by hot air, microwave drying equipment, spray, variable temperature pressure expansion and vacuum freezing. The physical properties such as wetting subsidence, dispersity, solubility and bulk density were studied. The comprehensive evaluation of 5 kinds of black jujube powder was calculated by coefficient of variation method, and the quality characteristics of dried jujube powder were explored by drying method. 5 methods were used to evaluate the quality of black jujube powder. To determine the best drying method of black jujube powder.
Key words: black jujube microwave drying; comprehensive score; drying; quality characteristics
Black jujube, also known as soft jujube and Junqianzi, is mainly divided into two categories: nucleated and seedless. Black jujube can improve human immunity, inhibit the growth and reproduction of cancer cells, promote the growth of white blood cells in vivo, reduce the content of serum cholesterol, and then improve serum albumin, protect human liver. It plays an important role in preventing and treating osteoporosis and postpartum anemia. Therefore, the nutritional value of black jujube is very rich, and it can be used as an ideal raw material for various health products and food research and development. In China, black jujube pulp has been used to reduce fever and promote endocrine in traditional medicine. It has obvious effect on tonifying kidney and nourishing stomach. It is called “nutrition warehouse”.
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