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- Title
Properties analysis of pigment from walnut husks (Juglans regia L.).
- Authors
ZHANG Xue-chun; WANG Zhen-xing; JIN Bo; FAN Fang-yu; LIU Yun; KAN Huan; GE Chang-rong
- Abstract
[ Objective ] The properties and drying methods of pigment from walnut husks ( Juglans regia L. ) were studied to provide references for the development and utilization of walnut husks. [ Method ] Green husk pigment was extracted and purified from walnut husks ( Juglans regia L. ) by alkali extraction and acid precipitation. The main chemical compositions of green husk were identified. The effects of pH value, heating time, thickeners and copigments on green husk pigment were studied, and the stability of the pigment dried by different drying methods was also studied. [ Result ] The main components of green husk pigment included alkaloids, phenols, flavones and anthraquinones. Green husk pigment was stable at alkaline condition, and heating could lead to color fading. Thickeners, gallic acid, glucose and acid hydrolyzed casein enhanced the color of pigment in a certain extent. Green husk pigment dried by freeze-drying was more stable than vacuum drying and hot air drying. [ Conclusion ]Copigments and drying methods have critical effects on coloration and stability of green husk pigment, so proper copigments and drying methods should be chosen during food processing.
- Publication
Journal of Southern Agriculture, 2014, Vol 45, Issue 8, p1461
- ISSN
2095-1191
- Publication type
Article
- DOI
10.3969/j :issn.2095-1191.2014.8.1461