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经稳定性研究发现，IPY具有一定的耐热、耐酸、耐碱及耐高渗性能，在温度不高于65℃、PH4～11的范围内具有较好的稳定性；在60％的高浓度蔗糖溶液中还能保持活性。并通过在各种条件下的紫外、荧光分析了活性与其结构之间的关系。
According to the stability study, IPY has a certain degree of heat resistance, acid resistance, alkali resistance and high permeability, and has good stability at a temperature of not higher than 65 ° C and a range of PH4 to 11. At a high concentration of 60% Sucrose solution also remained active. The relationship between the activity and its structure was analyzed by UV and fluorescence under various conditions.