桉叶精油微胶囊包埋油含量测定方法的比较

Comparative Study on Determination Methods of Oil Encapsulated in Eucalyptus E ssential Oil Microcapsules

目的比较3种测定桉叶精油微胶囊包埋油含量的方法,为包埋油含量的测定提供科学依据。方法采用干燥失重法、挥发油测定法和紫外分光光度法对桉叶精油微胶囊包埋油含量进行测定,并对这3种方法进行对比分析。结果 3种方法的RSD值均不超过5%,加标回收率均在90%～120%之间,均具有良好的精密度和准确度。干燥失重法测定结果偏高。紫外分光光度法操作复杂,相对成本较高,但检测速度快。挥发油测定法操作简便、成本低,但耗时较长。结论 3种方法均适合包埋油含量的测定,但挥发油测定法和紫外分光光度法精密度和准确度更高。

It aims to provide a scientific basis in determining amount o f oil encapsulated in essential oil microcapsules by comparing three determination methods. Amount of the encapsulated oil was determined by weight loss method, di stillation method and ultraviolet spectrophotometry. Then the three methods were compared and analyzed. The three methods all had good precision and accuracy with RSDs no more than 5% and indexed recovery at 90%-120%. The values determined by weight loss method were higher than the others. Ultraviolet spectrophotometry method was complex and had high cost, but had high detection speed. Distillation method was easy to operate and had low cost, but time-consuming was more. In conclusion, the three methods are all suitable for the amount determination of the oil encapsulated in esse ntial oil microcapsules, but distillation method and ultraviolet spectrophotometry method have better precision and acc uracy.