Determination of Nitrite in Meat Products using a Metalloporphyrin Based Nitrite-Selective Membrane Electrode

(J. L. , T. U. F. C. - N. , R., Eds.) Leonardo Electronic Journal of Practices and Technologies, (9), 5-16 (2006) .

Jantsci Lorent, Technical University from Cluj-Napoca, Romania

Abstract

The potentiometric response characteristics of a nitrite-selective electrode based on Co (III) tetraphenylporphyrins (TPP) in o-nitrophenyloctylether plasticized polyvinyl chloride membranes are compared. To establish the optimum composition of the membrane, different molar percents of cationic derivative (0-100 mol% relative to ionophore) were used. The influence of different plasticizers: o-nitrophenyloctylether, dioctylphtalate and tricresilphosphate on potentiometric answer were studied. Electrodes formulated with membranes containing 1 wt% ClCoTPP, 66 wt% o-NPOE, 33 wt% PVC (plasticizer:PVC = 2:1) and the lipophilic cationic derivative (10 mol%) are shown to exhibit high selectivity for nitrite over many anions, except the lipophilic anions perchlorate and thiocyanate. The electrodes based on Co (III) porphyrins were used for the potentiometric determination of nitrites in meat products. The results were compared with a colorimetric method used as the reference method. There was a good agreement between the potentiometric and colorimetric procedures.



Add your rating and review

If all scientific publications that you have read were ranked according to their scientific quality and importance from 0% (worst) to 100% (best), where would you place this publication? Please rate by selecting a range.


0% - 100%

This publication ranks between % and % of publications that I have read in terms of scientific quality and importance.


Keep my rating and review anonymous
Show publicly that I gave the rating and I wrote the review