A comparison was effectuated between the analysis conducted using the Boehringer Mannheim enzymatic kit with the relative spectrophotometric analysis and the CDR FOODLAB instrument (www.foodlab.cdr-mediared.it) used for analysis of lactic acid in samples of milk. In particular, the costs of each analysis were evaluated and also the time necessary to effectuate the said analysis.
The main aspect is the practicality in the overall aspects connected to the use of the two analytical instruments for the analysis of lactic acid in samples of milk.
In fact, the CDR FOODLAB analyzer requires less handling in respect of the addition of the R1a And R2 reagents, does not require preliminary treatments of the sample and supplies a result expressed directly in concentration terms (ppm) of lactic acid present in milk.
Instead, the chemical analysis carried out via the Boehringer Mannheim enzymatic kit for L-lactic acid foresees a more consistent use of handling, glassware, reagents and analysis time. This analysis, in fact, requires the preparation of solutions (Carrez I and Carrez II) with the consequent utilisation of glassware (beaker, pipette, etc.) and long waiting times between one step and another of the determination.