Study On Post-harvest Physiology And Storage Technique Of Whangkeumbae

In this paper, postharvest physiology and storage technology of fresh Whangkeumbae were systematically studied under different storage temperature and different atmosphere conditions. The freezing point and the changes of respiration intensity, firmness the soluble solid, reducing sugar, total sugar, titratible acid, poly-phenol, Vc, MDA, PPO activity, AsA-POD activity were studied. The effects of controlled atmosphere on the quantity, the filtration of medicaments that could prevent Whangkeumbae from putrescence and scald, the impact of different packages and different pre-cooling manner upon Whangkeumbae were also included in this article. The optimum storage technology of Whangkeumbae was developed. The main research contents and results were as follow:1. The study on the respiration of Whangkeumbae in the room temperature showed that the distincitive respiration peak was not found during storage after harvest. It belonged to non-climacteric fruit.2. The weight-loss rate, the moisture rising and the respiration action of Whangkeumbae during storage were reduced markedly by the low temperature combined with the appropriate low-oxygen content and the package of PVC film bag with holes.3. With the storage time, the firmness of Whangkeumbae reduced gradually, CA had a good effect on keeping firmness. The condition that the oxygen content of 3%-5% and the carbon dioxide content under 1% at the temperature of 0℃ had the best quantity that the firmness is 7.22 MPa.4. During storage, Vc and titratable acid content decreased constantly; the contents of reducing sugar, total sugar and the soluble solid increased gradually at prophase then decreased during anaphase; poly-phenol and MDA content rose slowly in the earlier stage and rose rapidly in the later time; the activity of PPO enzyme decreased at initial stages and increased during telophase; the activity of AsA-POD increased at the early days then decreased constantly.5. The poly-phenol content was positively correlated with the activity of PPO, the firmness and the activity of AsA-POD were negatively correlated with the MDA content and Vc content respectively of Whangkeumbae significantly; the correlation coefficients were 0.859, -0.969 and -0.948 respectively.