Photolyse de la riboflavine dans le lben
Résumé
La photodégradation de la riboflavine dans le Iben a été comparée à celle du lait et les emballages les plus utilisés par l'industrie laitière marocaine ont été examinés pour leur protection de la lumière de la riboflavine dans le lait et le Iben. Pour l'effet du Iben sur la photolyse de la riboflavine, des échantillons de Iben et de lait ont été exposés à la lumière fluorescente et les constantes de vitesse de photolyse de la riboflavine dans ces deux produits ont été comparées. Les.constantes de vitesse de photodégradation de la riboflavine dans le lait étaient d'environ quatre fois supérieures à celle du Iben. La différence de pH entre le lait et le Iben n'explique pas la différence de photostabilité trouvée entre les deux produits. Pour l'effet des deux types d'emballages sur la photolyse de la riboflavine, des échantillons d'un demi-litre de lait pasteurisé et de lb en ont été exposés à la lumière fluorescente et les constantes de vitesse de photolyse de la riboflavine calculées ont été comparées. Les constantes de vitesse de photolyse de la riboflavine dans les sachets de polyéthylène ou BMP (Blow Molded polyethylen) ne sont pas statistiquement différentes (p<5%), cependant ces constantes de vitesse dans les sachets de polyéthylène étaient d'environ trois fois supérieures à celle du carton. Cette différence a été expliquée par la différence de transmittance trouvée entre ces emballages.
Riboflavin photolysis in lben
Riboflavin photolysis in lben and milk were compared and the main pasteurized milk and Iben packages used by the moroccan dairy industry were examined for their protection from light ofriboflavin in milk. For Iben effect on riboflavin photolysis, sampi es of Iben and milk were exposed to fluorescent light and the calcl,llated rates of riboflavin photolysis were compared between Iben ud milk. It was found that the rate constant for riboflavin photolysis in milk was about 4 times higher than that of Iben. The difference in pH between milk and Iben does not explain the difference found in riboflavin photostability between the two products. For the two types of packages effects on riboflavin photolysis, samples ofhalf-liter ofpasteurized whole milk or Iben were exposed to fluorescent light and the calculated rates of riboflavin photolysis were compared. It was found that the rates constants for riboflavin photolysis in milk or Iben packaged in pouches of BMP (Blow molded polyethylen) were not statistically different, while the rates constants for riboflavin photolysis in milk packaged in pouches ofBMP were about 3 times higher than that packaged in "carton". This difference was explained by the difference found in light transmittance between these packages.
Riboflavin photolysis in lben
Riboflavin photolysis in lben and milk were compared and the main pasteurized milk and Iben packages used by the moroccan dairy industry were examined for their protection from light ofriboflavin in milk. For Iben effect on riboflavin photolysis, sampi es of Iben and milk were exposed to fluorescent light and the calcl,llated rates of riboflavin photolysis were compared between Iben ud milk. It was found that the rate constant for riboflavin photolysis in milk was about 4 times higher than that of Iben. The difference in pH between milk and Iben does not explain the difference found in riboflavin photostability between the two products. For the two types of packages effects on riboflavin photolysis, samples ofhalf-liter ofpasteurized whole milk or Iben were exposed to fluorescent light and the calculated rates of riboflavin photolysis were compared. It was found that the rates constants for riboflavin photolysis in milk or Iben packaged in pouches of BMP (Blow molded polyethylen) were not statistically different, while the rates constants for riboflavin photolysis in milk packaged in pouches ofBMP were about 3 times higher than that packaged in "carton". This difference was explained by the difference found in light transmittance between these packages.