结果表明，在发酵过程中，添加一定量的柠檬酸钠可乳酸对嗜酸乳杆菌的胁迫作用，从而提高了活菌密度。

• The results showed that citrate sodium added to ferment liquid could decrease the stressing effect and enhance density of Lactobacillus acidophilus during fermentation.