人们食用的油脂 ,贮存一段时间后 ,很容易变质 ,产生令人不愉快的气味。这是因为油脂会发生自动氧化作用 ,通过形成过氧化物而造成的酸败。油脂的酸败不像食物腐败、霉变那样容易引起人们的注意。当闻到不正常的气味时 ,油脂的过氧化物含量大约在０．４ % ,已经大大超过国家标 People eat the grease, after storage for a period of time, it is easy to deteriorate, resulting in unpleasant odor. This is because fat can auto-oxidize and cause rancidity through the formation of peroxides. Fat rancidity unlike food spoilage, mildew as easy to attract people’s attention. When you smell abnormal odor, the peroxide content of grease is about 0.4%, has greatly exceeded the national standard