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在中国对虾的血清、肌肉和肝胰腺提取液中有酸性磷酸酶（ＡＣＰ）、碱性磷酸酶（ＡＬＰ）、过氧化物酶（ＰＯＤ），其中，ＡＣＰ和ＡＬＰ？在肝脏中的活性最高。采用１．０％的聚甘露糖醛酸多糖作为免疫药物，对中国对虾进行注射刺激后，发现血清中的溶菌和溶血活性有显著提高；肝胰腺中的ＡＣＰ和ＡＬＰ活性也有明显增加，在７２ｈ，ＡＣＰ活性由对照组的３．２１Ｕ·１００ｍＬ－１提高到９．６９Ｕ·１００ｍＬ－１，ＡＬＰ活性由４．０９Ｕ·１００ｍＬ－１提高到 １３．２Ｕ·１００ｍＬ－１，而血清和肌肉中这两种酶活性的变化不很明显。在血清、肝胰腺和肌肉中ＰＯＤ活性变化不明显。聚甘露糖醛酸多糖具有一定的增强中国对虾免疫活性的作用。
In the Chinese shrimp serum, muscle and hepatopancreas extract acid phosphatase (ACP), alkaline phosphatase (ALP), peroxidase (POD), which ACP and ALP? The highest activity in the liver. Using 1.0% polymannuronic acid polysaccharide as immune drug, we found that the bacteriolytic and hemolytic activities in serum were significantly increased after injection stimulation of P. chinensis. The activities of ACP and ALP in hepatopancreas also increased obviously. After 72h , The activity of ACP increased from 3.21U · 100mL-1 to 9.69U · 100mL-1 in control group, ALP activity increased from 4.09U · 100mL-1 to 13.2U · 100mL-1, while in serum and muscle, Changes in the two enzyme activity is not obvious. POD activity did not change significantly in serum, hepatopancreas and muscle. Polymannuronic acid polysaccharides have a certain role in enhancing the immunocompetence of P. shrimp.