高效液相色谱法测定上海市不同室内环境屋尘中麦角甾醇的含量

Determination of ergosterol amount in house dust of different indoor environment in Shanghai City by HPLC

目的建立了室内屋尘麦角甾醇含量的高效液相色谱测定方法,考察该方法用于室内屋尘麦角甾醇检测的可行性,并对上海市不同功能分区室内屋尘麦角甾醇含量进行检测,以期将其作为真菌生物量的标志物.方法在2004年12月～2005年1月间,选取了上海市区典型的9个不同功能分区的室内环境,分别代表不同的室温条件、通风情况、有无空调取暖设备、人员活动及宠物饲养情况等.用吸尘器采集屋尘,配合过筛的方法,加甲醇超声提取,过滤、冷凝回流、皂化、蒸干后高效色谱仪定量分析,并结合气质联用技术进行定性以及分子结构的分析.结果标准曲线的范围为0.02～0.80g/L,线性良好,最低检测浓度为0.0005g/L;日内及日间相对标准差分别为10.2%～11.7%和4.54%～7.34%,绝对回收率为77.1%～80.1%。现场结果表明,麦角甾醇含量随采样点的不同有较大差异,大体上与温度、人流活动情况成正相关,与自然通风状况成负相关,最高可迭66.0μg/g屋尘。结论本方法灵敏、准确、稳定,可用于环境中麦角甾醇的含量测定,并结合气质联用技术,复核结果的可靠性。实际采样结果表明上海市各功能分区的室内环境中普遍存在不同程度的真菌污染。

Objective A high performance liquid chromatographic （HPLC） method was developed for the determination of the amount of ergosterol in house dust, and was examined the feasibility on determination of ergosterol in house dust. According to the established method, different house dusts derived from different functional indoor air was sampled and determined. We expected to regard ergosterol as an indicator of fungal biomass. Methods We picked up dust samples from nine typical functional indoor area to represent different room temperature, ventilation, air conditioning, human activities, pet-feeding, et al, during Dec 2004 to Jan 2005. The house dust was sampled with a dust collector, and filtrated with a filter. Fine house dusts were extracted by ultrasonic blending, filtration, refluxing, saponification and evaporation. High liquid chromatography was carried out and combined with gas chromatography （GC）-mass spectrometry （MS） to analyze the molecular structure. Results A linearity association was observed in the range of 0.02 to 0.8g/L ergosterol. The detection concentration was 0.0005g/L. The intra-and inter-day relative standard deviations （RSD） were in the range of 10.2% - 11.7% and 4.54% - 7.34% , respectively. The absolute recoveries ranged between 77.1% and 80.1%. Survey results showed the amount of ergosterol differed greatly from the different sampling spots. The amount of ergosterol had a positive correlation with room temperature and people denseness, while had a negative correlation with natural ventilation, briefly, The highest amount was 66.08μg/g （house dust）. Conclusion The method is sensitive, accurate and feasible. It can examine different ergosterol content in environmental matrix. Followed by GC-MS, the reliability of the results can be further checked. The sampling data show there are different degrees of fungal contamination in typical indoor air of Shanghai City.