Trinity Lactate Reagent 10x10 ml, #735-10. Try this.

http://www.trinitybiotech.com/ClinicalChemistry/Pages/ProductDetails.aspx?ProductNumber=735-10&Filter=*735-10*

Hi there,

You can also  have a go with the Sigma kit:

http://www.sigmaaldrich.com/content/dam/sigma-aldrich/docs/Sigma/Bulletin/1/mak064bul.pdf

Hi,

Here is a colorimetric method you can use !

http://www.sciencedirect.com/science/article/pii/S2215016114000156

Best,

capillary electrophoresis

I do lactic malic fumaric succinic citric and tartaric acid via GC by making isopropyl esters.