Facing the current situation of organic chemistry courses in colleges and universities, such as too much content, insufficient class hours, insufficient students’ absorption and inadequate practice, this paper effectively introduces the combination of online and offline teaching mode in the teaching process of organic chemistry. This teaching mode is diversified and has strong advantages. It gives full play to the leading role of teachers in guiding, inspiring and supervising in the teaching process, stimulates students’ interest in learning, promotes teachers’ teaching reform ability, and achieves good teaching effect.

The need for healthy food is much stringent than before. Food packaging is an important part in the production of food. The migration of silver nanopartilcles in nanosilver packages should be detected carefully. In this paper, the migration of silver nanoparticles in nano-silver/polypropylene milk storage packages was studied by UV-vis, which could be available in the evaluation of food packages.