Influence of storage time on nitrite content in vegetables
Liu Shu-zhan · Laboratory Science · 2015
Based on the reform of three semesters system in university of science and technology of china( USTC),the research- oriented chemical course primary training of chemical research was set up in summer semester since 2011. The experiment of the influence of storage time on nitrite content in was illustrated. The teaching process and experience summary were also introduced. In this experiment,nitrite contents in different vegetables were examined with the method of naphthalene ethylene diamine hydrochloride spectrophotometry. Results indicated that fresh vegetables have the lowest nitrite contents,and the contents in leaf vegetables were slightly higher than those in rootstalk vegetables. However,as the storage time prolonged,the nitrite contents were increasing with varied degrees in different vegetables. And the increasing trend were more obvious in leaf vegetables.