A rapid and sensitive fluorescence method for detecting urine formaldehyde in patients with Alzheimer’s disease

作者：Shuiqing Li, Jun Wang, Tingting Li, Chang Zhao, Yonghe Tang, Weishan Wang, Shengjie Zhao, Wenjing Jiang, Yalan Di, Xuechao Fei, Hongjun Luo, Hui Li, Wenhong Luo, Yan Yu, Weiying Lin, Rongqiao He, Zhiqian Tong · 发表于：Annals of Clinical Biochemistry International Journal of Laboratory Medicine · 年份：2018 · DOI：10.1177/0004563218812986 · 被引用次数：20 · 研究领域：Indoor Air Quality and Microbial Exposure、Advanced Chemical Sensor Technologies、Antioxidant Activity and Oxidative Stress

BACKGROUND: Morning urine formaldehyde concentrations could predict the severe degree of dementia in patients with post-stroke dementia and Alzheimer's disease. However, the routinely available technique of high-performance liquid chromatography (HPLC) for detecting urine formaldehyde requires expensive and sophisticated equipment. METHODS: We established a fluorescence spectrophotometric method by using a formaldehyde-specific fluorescent probe-NaFA (λex/em = 430/543 nm). As a standard reference method, the same batch of urine samples was analysed by HPLC with a fluorescence detector (λex/em = 346/422 nm). Then we compared the limits of detection and the limits of quantization detected by these two methods and addressed the relationship between urine formaldehyde and human cognitive ability. The Mini-Mental State Examination (MMSE), Clinical Dementia Rating and Activities of Daily Living scale were used to evaluate cognition function in 30 Alzheimer's disease patients and 52 healthy age-matched controls. RESULTS: Limits of detection and limits of quantization (1.27 and 2.48 μM) of the NaFA probe method were more accurate than Fluo-HPLC (1.52 and 2.91 μM). There was no difference in the detected formaldehyde values within day and day-to-day. Notably, only 3/82 urine formaldehyde concentrations detected by NaFA probe were below zero, while 12/82 of the values analysed by Fluo-HPLC were abnormal. More importantly, there were negatively correlated between urine formaldehyde conc...