Quantitation of plasma 13C-galactose and 13C-glucose during exercise by liquid chromatography/isotope ratio mass spectrometry.

Quantitation of plasma 13C-galactose and 13C-glucose during exercise by liquid chromatography/isotope ratio mass spectrometry.
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通过液相色谱/同位素比质谱法对运动期间血浆 13C-半乳糖和 13C-葡萄糖进行定量。

DOI:
10.1002/rcm.5139
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发表时间:
2011
期刊:
RCM
影响因子:
--
通讯作者:
Morrison DJ
Morrison DJ
中科院分区:
--
文献类型:
--
作者:
Morrison DJ

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在竞技运动中,运动条件下碳水化合物的利用是相当重要的。结合最佳的宏量营养素可以提高运动员的耐力表现。然而,在持续运动下获得代谢分配的理解可能是有问题的,同位素标记方法可以帮助量化底物利用。采用13c‐半乳糖法研究了口服半乳糖的利用,并采用液相色谱/同位素比质谱法(LC/IRMS)测定了血浆中半乳糖和葡萄糖的富集程度。低至100 μL的等离子体只需要极少的样品处理就可以分析。focus被用作定量血浆半乳糖和葡萄糖浓度以及同位素富集的化学和同位素内标。半乳糖和葡萄糖的近距离洗脱需要一个校正程序,以允许测量和校正血浆葡萄糖δ13C,即使在非常高富集的半乳糖存在的情况下。LC/IRMS测定的葡萄糖浓度与酶促法测定的葡萄糖浓度的Bland - Altman图显示了两种方法之间的良好一致性。7名训练有素的自行车运动员在运动前补充半乳糖的数据表明,半乳糖转化为葡萄糖,可用于随后的能量代谢。版权所有©2011 John Wiley & Sons, Ltd
The utilisation of carbohydrate sources under exercise conditions is of considerable importance in performance sports. Incorporation of optimal profiles of macronutrients can improve endurance performance in athletes. However, gaining an understanding of the metabolic partitioning under sustained exercise can be problematical and isotope labelling approaches can help quantify substrate utilisation. The utilisation of oral galactose was investigated using13C‐galactose and measurement of plasma galactose and glucose enrichment by liquid chromatography/isotope ratio mass spectrometry (LC/IRMS). As little as 100 μL plasma could readily be analysed with only minimal sample processing. Fucose was used as a chemical and isotopic internal standard for the quantitation of plasma galactose and glucose concentrations, and isotopic enrichment. The close elution of galactose and glucose required a correction routine to be implemented to allow the measurement, and correction, of plasma glucose δ13C, even in the presence of very highly enriched galactose. A Bland‐Altman plot of glucose concentration measured by LC/IRMS against glucose measured by an enzymatic method showed good agreement between the methods. Data from seven trained cyclists, undergoing galactose supplementation before exercise, demonstrate that galactose is converted into glucose and is available for subsequent energy metabolism. Copyright © 2011 John Wiley & Sons, Ltd.
使用液相色谱-同位素比质谱法对生物蛋白水解产物中的氨基酸进行 delta13C 分析的三相液相色谱方法。
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