Effects of storage conditions on contents of nutrient components and nitrite in three kinds of wild vegetables.

Capsella bursa-pastoris L.,Ixeris denticulate and Cirsium setosum were stored under cold storage and frozen storage respectively.The changes of nutrient components and nitrite contents were investigated during the storage process.The result showed that the content of protein,vitamin C,total carotenoids in three kinds of potherb decreased significantly under both storage conditions while the increase of contents of crude fiber was not significant.The content of nitrite had a peak at the second day,and then it decreased.At the sixth day,the content of nitrite increased again.The change of nitrite in potherb preserved in cold storage was more obvious than that in frozen storage.