The bacilli decomposes the organic compounds which are excreted by armpit big sweat glands, and creates unsaturated fatty acids such as dissociate fatty acid, and then causes the odor.

• 不饱和脂肪酸容易氧化，产生大量的氧化物，过氧化氢，进而分解为醛类、醛酸类、醇类、烃类、酮类化合物，这就是异味的主要来源。