EVALUATION OF METHODS USE FOR DETECTION OF FORMALIN IN MILK | ||
| Journal of Food and Dairy Sciences | ||
| Article 3, Volume 27, Issue 9, September 2002, Pages 6033-6040 PDF (334.63 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jfds.2002.256852 | ||
| Authors | ||
| T. A. Nassib,1; A. M. Taleb2; Manal A. Naiem2 | ||
| 1Dairy Science Department, Fac. of Agric. ansoura Univ, Egypt. | ||
| 2Dairy Chemistry Laboratory, Anim. Prod. Res. Inst., Ministry of Agriculture, Egypt. | ||
| Abstract | ||
| Seven colonmetoc methods were conducted to delect formalin in either in water solutions, or in milk containing differe.,! concentration of formalin (1-1000 ppm). The methcds used were : Hehner's test (1) : Leech's lest (2) ; Shrewsbury and Knapp's test (3) : Nash's reagent (4): ChromotroplC acid method (5) , Schryver's test (6j and phenylhydrazin potasslurn (errocyanid test (7). It was noticed that methods (4) and (5) were more sensitive than others (or detecting formalin In water solutions. whereas the most ssnsnive methods to detect formalin in milk samples were (2), (4i and (5). On the other hand. with water-base solution. methods (1), (2) and (3) failed 10 detect either low Of high formalin concentrations, while methods (6) and (7) failed only tc detect the lower concentrations. The same trend was obtained with milk samples except method (2) which was sensitive for all concentrations. Methods (4) and (5) were selected to detecte the presence of formalin in the whey of acid coagulation cow's milk (with sulphuri¢ or ac=tic acid), and in the distilate obtained by indirect distilation of milk samples. The results obtained by using method (4) were always less than the actual polluted concentralions and represent - 58-62% in the case of acid whey and 37-52% in the indirect dislilation method. Examination 01 the presence of formalin in acid whey by using method (5) 10 detect it, however, more accurate results were obtained by using indirecl distilalion method compared with method (4) (5:'-70% vs, 37-52%, respectively) | ||
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