
- Description
- Additional Information
- Readable Documents
- Assay Principle
- Reviews
Introduction
Lactate is an intermediate product of carbohydrate metabolism. Of the two forms of Lactate, D- and L-, the L- lactate is predominant isomer found in biological systems. L-lactate is formed during the anaerobic glycolysis by conversion of pyruvate to L-lactate by lactate dehydrogenase. Lactate level is an indicator for tissue oxygen demand and utilization. Abnormally high lactate levels are associated with diseases such as diabetes and lactate acidosis. Cell Technology’s Fluoro Lactate assay is a lactate oxidase-based method for detecting L-lactate in biological samples such as serum, plasma, blood, urine, and tissue extract.
In the assay, lactate oxidase (LOX) catalyzes the oxidation of L-lactate to pyruvate, along with the concomitant reduction of hydrogen peroxide (H2O2). The detection utilizes a non-fluorescent detection reagent, which is oxidized in the presence of horse radish peroxidase (HRP) and LOX to produce its fluorescent analog.
Cell Technology’s Fluoro Lactate assay provides a reliable, sensitive fluorimetric method for the quantification of lactate in biological samples such as serum, plasma, urine, and tissue extracts.
Figure.1 Standard curve of Lactate. 50 µl serial dilutions of lactate (Starting dose 40 µM in tubes) were added to the wells of 96-well fluorescent plate. 10 µL LOX was added to each well and incubated plate at 37ºC for 10 min. 50 µL of detection reagent was added and plate was read at Ex/Em=530/590 nm.
Table 1. An example showing serum L-lactate level. 50 μl diluted serum was added to the wells of 96 –well fluorescent plate. 10 μl LOX was added to each well and incubated plate at 37ºC for 10 min. 50 μl of detection reagent was added and plate was read at Ex/Em=530/590 nm.
Table 2. Spike and recovery experiments were performed to estimate % recovery of lactate. Serum (1:100) was spiked with lactate with the concentrations mentioned in the table above. The samples were processed as described in the protocol.
Table 3. Spike and recovery experiments were performed to estimate % recovery of lactate. Serum (1:100), heat-inactivated @ 56ºC, 30 min) was spiked with lactate with the concentrations mentioned in the table above. The samples were processed as described in the protocol.
Key Benefits
- Highly effective and stable fluorescent assay for L-lactate.
- Simple and fast assay-add the reagent directly to your experimental samples. Plate can be incubated and read in 15-30 min.
- Works for serum, plasma and tissue extract.
Additional information
Kit Size | 100 |
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Document Title |
Fluoro Lactate Protocol |
msds.FluoroLactate |
Reference |
Hasegawa H., Fukushima T., Lee J., Tsukamoto K., Moriya K., Ono Y. and Imai K. (2003) Determination of serum D -lactic and L -lactic acids in normal subjects and diabetic patients by column-switching HPLC with pre-column fluorescence derivatization. Anal Bioanal Chem 377:886-891. |
Kondoh Y., Kawase, M. and Ohmori S. (1992) Concentration of D-Lactate and its metabolic intermediates in liver, blood, and muscle of diabetic and starved rats. Res Exp Med 192: 407-414. |
Lin, C. Y., Chen S. H., Kou G. H., Kuo C. M. (1999) An Enzymatic Microassay for Lactate. Concentration in Blood and Hemolymph. Acta Zoologica Taiwanica 10: 91-101. |
McLellan, A. C., Phillips, S. A., and Thornally, P. J. (1992) Flourimetric assay of D-lactate. Anal Biochem 206: 12-16. |
Scheijen J.L., Hanssen N. M., van de Waarenburg M. P., Jonkers D. M., Stehouwer C. D., Schalkwijk C. G. (2012) L(+) and D(-) lactate are increased in plasma and urine samples of type 2 diabetes as measured by a simultaneous quantification of L(+) and D(-) lactate by reversed-phase liquid chromatography tandem mass spectrometry. Exp Diabetes Res. 2012(doi:10.1155/2012/234812). |
White R., Yaeger D., and Stavrianeas S. Determination of Blood Lactate Concentration: Reliability and Validity of a Lactate Oxidase-Based Method (2009) Int. J. Exerc Sci 2: 83-93. |
Part# | Reagent | Temperature |
Part # 7022 | Lactate Standard 4mM, 500µl | 2-8C |
Part # 6004 | Horseradish Peroxidase, 18.9 Units | 2-8C |
Part # 3011 | 5X Reaction Buffer, 25 mL | 2-8C |
Part # 4026 | Detection Reagent, 1 Vial | -20C |
Part # 6025 | Reaction Enzyme Mix, 1 Vial - 1.1mL | -20C |
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1.若都为正常,那么并未有太大问题,只要定期复查就可以了。
2.如果TGAb、TMAb、甲状腺功能均高,那么就是桥本氏甲状腺炎并甲亢,需要抗甲亢治疗。
3.如果TGAb、TMAb高,甲状腺功能下降,那么就是桥本氏甲状腺炎并甲减,需要进行甲减治疗。
4.如果TGAb、TMAb高,甲状腺功能正常,那么就是桥本氏甲状腺炎,无需特殊治疗,只要定期复查甲状腺功能就可能以了,不过这种情况有可能以后演变成甲减或者甲亢。
辣根过氧化物酶(Horseradish Peroxidase,HRP)比活性高,稳定,分子量小,纯酶容易制备,所以最常用。HRP广泛分布于植物界,辣根中含量高,它是由无色的酶蛋白和棕色的铁卟啉结合而成的糖蛋白,糖含量18%。HRP由多个同功酶组成,分子量为40,000,等电点为PH3~9,酶催化的最适PH因供氢体不同而稍有差异,但多在PH5左右。酶溶于水和58%以下饱和度硫酸铵溶液。HRP的辅基和酶蛋白最大吸收光谱分别为403nm和275nm,一般以OD403nm /OD275nm的比值RZ(德文Reinheit Zahl)表示酶的纯度。高纯度的酶RZ值应在3.0左右(最高可达3.4)。RZ值越小,非酶蛋白就越多。 1) RZ>3 活性 >250u/mg, 主要应用于免疫学,是高纯度的过氧化酶。采用特殊色谱纯化技术以除去会影响免疫学反应的同工酶B .
2) RZ>2 活性 >180u/mg ,主要应用于临床化学,我们的客户也有将这个规格的产品应用于免疫学研究的。此时,一个标准化的分析方法就变得尤为重要。
3) RZ>1 活性 >100u/mg,主要应用于血糖试纸和尿液分析试纸。
4) RZ>0.6 活性 >60u/mg ,主要应用于尿液分析试纸。向左转|向右转

