AbstractInteresterification of tripalmitin and stearic acid inn‐hexane was investigated with surfactant‐modified lipases. Various kinds of lipases and surfactants were screened for high interesterification activity of the modified lipases. The modified‐lipase hydrophile‐lipophile balance value and fatty acid group of the surfactants. The modified lipase obtained fromRhizopus japonicus with sorbitan monostearate as surfactant had the highest activity in then‐hexane system. The interesterification activity of the selected modified lipase in molten substrates at 75°C without solvents was the same as that in then‐hexane system at 40°C.
摘要 利用表面活性剂修饰的脂肪酶研究了三棕榈酸和硬脂酸在己烷中的酯化。筛选了各种类型的脂肪酶和表面活性剂,发现改性脂肪酶具有较高的酯化活性。研究了改性脂肪酶的亲水-亲脂平衡值和表面活性剂的脂肪酸基团。以山梨醇酐单硬脂酸酯为表面活性剂的日本根霉改性脂肪酶在当时的正己烷体系中活性最高。在不使用溶剂的情况下,所选改性脂肪酶在 75°C 的熔融底物中的酯化活性与在 40°C 的正己烷体系中的活性相同。