Loss of THCCOOH from Urine Specimens Stored in Polypropylene and Polyethylene Containers at Different Temperatures
作者:P. R. Stout、C. K. Horn、D. R. Lesser
DOI:10.1093/jat/24.7.567
日期:2000.10.1
The loss of Δ9-tetrahydrocannabinol (THCCOOH) from urine specimens stored in polypropylene and polyethylene containers at 4°C and 25°C was examined. All specimens were analyzed by GC-MS after sampling at various times over a one-week period. Data were analyzed by one-way analysis of variance and fitted with a first order kinetic equation. Rapid loss of THCCOOH was seen at 4°C for both polypropylene (14% maximal loss, t½ = 0.53 min) and polyethylene (17% maximal loss, t½ = 5.77 min) bottles. At 25°C, a small loss (< 5%) was observed in polypropylene and no significant loss was seen for urine in polyethylene. All losses stabilized within 1 h, and no further losses were seen over one week. The results indicate that THCCOOH binding may be due to decreased solubility of THCCOOH at lower temperatures and subsequent association of THCCOOH with the more lipophilic plastic. The results also indicate that polypropylene and polyethylene do not bind THCCOOH to such an extent as to compromise the integrity of specimens.
在4°C和25°C下,储存在聚丙烯和聚乙烯容器中的尿液样本中Δ9-四氢大麻酚(THCCOOH)的损失进行了研究。所有样本在一周内的不同时间点进行取样后通过气相色谱-质谱法(GC-MS)进行了分析。数据通过单因素方差分析进行分析,并拟合为一阶动力学方程。在4°C下,聚丙烯瓶的THCCOOH快速损失(最大损失14%,半衰期t½ = 0.53分钟),而聚乙烯瓶的损失也很快(最大损失17%,半衰期t½ = 5.77分钟)。在25°C下,聚丙烯瓶中观察到较小的损失(< 5%),而聚乙烯中的尿液没有显著损失。所有损失在1小时内稳定,且在一周内未见进一步损失。结果表明,THCCOOH结合可能是由于在较低温度下THCCOOH的溶解度降低,以及THCCOOH与更脂溶性的塑料的后续结合。结果还表明,聚丙烯和聚乙烯并没有以至于影响样本完整性的程度结合THCCOOH。