It is a reform for traditional and unartificial fermentation mode to product pickles by using artificial inoculation, as well as a symbol of the modern fermentation technology.

应用人工接种纯菌种腌制蔬菜是对传统自然发酵模式的一种变革，也是发酵技术现代化的一种标志，而研究冻干直投式发酵剂是目前发酵工业的一个热点。

The article briefly introduces the production of biacetyl and the relations of fermentation technology and biacetyl.The ways of how to manage the content of biacetyl during beer brewing are discussed.

摘要简述了啤酒中双乙酰的形成机制及发酵工艺与双乙酰的关系，提出了在啤酒实际生产中双乙酰含量的控制方法。