- 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 |
|---|
| 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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试题分析:酶是一种生物催化剂,在催化反应中本身不发生变化;此非酶的特性;B项体现了酶的作用条件较温和的特性;C项体现了酶的专一性;D项体现了酶的高效性;故选A。
考点:本题考查的是酶的特性。
点评:对于此类试题,学生应掌握酶的特性。
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。
英文名称:horseradish peroxidase;HRP
定义:一种糖蛋白,由于在辣根中该酶的含量很高,故名。它以铁卟啉为辅基,在过氧化氢存在时能催化苯酚、苯胺及其取代物聚合。
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。

