D-乳酸在糖尿病及高血壓之研究
The Study of D-Lactate in Diabetes Mellitus and Hypertension Disease
中文摘要
我們之前的研究，D-乳酸濃度可能可以作為偵測早期腎臟損傷之指標，考量這
些結果，我們藉由偵測人類尿液中D-乳酸的含量來確認糖尿病與高血壓疾病與
腎臟病變的相關性。
利用螢光衍生化試劑4-nitro-7-piperazino-2,1,3-benzoxadiazole (NBD-PZ) 將 D-乳 酸衍生化後，利用已建立之高效液相層析法，結合octadecylsilica 管柱 (ODS)及 掌性管柱 (amylose tris-3,5-dimethylphenylcarbamate coated on silica gel; Chiralpak AD-RH)，以高敏感度之螢光偵測方法，成功地檢測生物檢體中少量 D-乳酸的
濃度並發現對於生物檢體中微量的D-乳酸有好的分離效果。在分析方法確效中，
以20 μL 人類尿液為檢品時，其同日與異日間之準確度為 91.59-112.96%，同日 與異日間之精密度CV(%)為 1.56-11.99%。
藉由上述的分析方法，偵測正常人(n = 13)與糖尿病、高血壓病人(n = 80)尿液中 D-乳酸濃度，發現與正常人比對結果，病人尿液中 D-乳酸的濃度有明顯上升 (P<0.05)。另外，與正常人比對結果，病患在正常蛋白尿階段時，D-乳酸的濃度 展現上升之趨勢(P<0.05)，再者，病患在微蛋白尿階段時，尿液中 D-乳酸的濃
度亦比病患在正常蛋白尿階段時要來的高。綜合上述實驗結果，建議尿液中D-
乳酸的濃度可能可以作為偵測腎臟損傷的一個臨床前早期指標。
英文摘要
In our previous study, D-lactate levels may be used as an indicator to screen for early stages of kidney injury. Considering these results, we determined of human urinary D- lactate to verify the relation to nephropathy with diabetes Mellitus and hypertension diseases.
D-lactate and L-lactate were simultaneously determined by means of a high- performance liquid chromatography (HPLC) with fluorescence detection. As a fluorescence reagent, 4-nitro-7-piperazino-2, 1, 3-benzoxadiazole (NBD-PZ) was employed for the fluorescence derivatization of lactate. The proposed HPLC system adopted both octylsilica (ODS) and chiral columns (amylose tris-3,5-
dimethylphenylcarbamate coated on silica gel; Chiralpak AD-RH), which proved to give a sufficient enantiomeric separation of the lactate derivatives in the trace amount of biological sample. The accuracy values for the determination of D-lactate in 20 μL of human urine were 91.59-112.96%, and the intra- and inter-day precision values were within 1.56% and 11.99%, respectively.
The proposed HPLC method was applied to the urine of normal (n = 13) and diabetic
and hypertension patients (n = 80), and significant increases in D-lactate excreted into urine were observed in patients (p<0.05). In addition, D-lactate concentrations
showed a rising tendency from patients in normal albumin range compared with normal subject (p<0.05). Moreover, D-lactate levels significantly increased in patients with microalbuminuria as compared with normal subjects (p<0.05). These findings suggest that urinary D-lactate concentration may be offered the earliest subclinical sign of nephropathy.
