Various - vitamina t '98

Kinetics of ascorbic acid degradation in citrus juice concentrates (orange, lemon, grapefruit, tangerine) during an eight week storage at 28, 37 and 45   °C were investigated. The loss of ascorbic acid at each temperature followed a first-order kinetic model. Activation energy was determined in the range of   ±   –   ±     kcal   mol −1 . Ascorbic acid retention after storage at 28, 37 and 45   °C was about –%, –27% and –%, respectively. Since hydroxymethylfurfural (HMF) is one of the decomposition compounds of ascorbic acid degradation, its formation was also investigated. HMF accumulation fitted to a zero-order kinetic model and activation energy ranged from   ±   to   ±     kcal   mol −1 . Significant correlation was obtained between HMF accumulation and ascorbic acid loss at all storage temperatures in all citrus juice concentrates.

Place of Origin: Shaanxi China (Mainland)  MF: C20H28O  color: yellow powder  Port: xiamp;  Purity: 99%  Other Names: Vitamin A  Grade Standard: Cosmetic Grade, Food Grade, Med...  Model Number: sphh02145 

Various - Vitamina T '98Various - Vitamina T '98Various - Vitamina T '98Various - Vitamina T '98

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