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The Study of D-Lactate in Diabetes Mellitus and Hypertension Disease

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D- 乳酸在糖尿病及高血壓之研究

 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 (O DS) 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 9 1.59-112.96% ,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。

(2)

The Study of D-Lactate in Diabetes Mellitus and Hypertension Disease

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 t he relation to nephropathy with diabetes Mellitus and hypertension diseases.

D-lactate and L-lactate were simultaneously determined by means of a high-performance liqui d chromatography (HPLC) with fluorescence detection. As a fluorescence reagent, 4-nitro-7-p iperazino-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 (am ylose tris-3,5-dimethylphenylcarbamate coated on silica gel; Chiralpak AD-RH), which prove d to give a sufficient enantiomeric separation of the lactate derivatives in the trace amount of b iological sample. The accuracy values for the determination of D-lactate in 20 μL of human ur ine 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 hyp

ertension patients (n = 80), and significant increases in D-lactate excreted into urine were obse

rved 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 subj

ects (p<0.05). These findings suggest that urinary D-lactate concentration may be offered the e

arliest subclinical sign of nephropathy.

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