Fluorescence, browning index, and color in infant formulas during storage
Fluorescence, browning index, and color in infant formulas during storage
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DOI：
10.1021/jf0403585
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发表时间：
2005-06-15
影响因子：
6.1
通讯作者：
Calvo, C
中科院分区：
文献类型：
--
作者：
Ferrer, E;Alegría, A;Calvo, C
在20 ℃和37 ℃下储存2年期间，对乳基婴儿配方粉（IF）中游离和总荧光化合物、布朗宁指数和颜色形成进行了测量。来自415 nm发射的激发光谱显示三个峰（ex λ（1）= 270 nm，λ（2）= 325/315 nm，λ（3）= 350 nm），来自347 nm激发的两个发射峰（415和520 nm），并且没有观察到波长偏移。贮藏温度和时间对荧光强度和布朗宁指数的变化没有显著影响。然而，一个重要的增加戊二赖氨酸记录-可能是因为铁和抗坏血酸含量的样品-以及适应IF的布朗宁指数。在两种IF中，观察到在整个储存过程中颜色增加（Δ E），在37 ℃下储存的样品中的这种增加大于在20 ℃下储存的样品中的增加。颜色随时间的增加符合线性回归模型。颜色似乎是足够灵敏度的指标，以测量温度或储存时间的影响。
Free and total fluorescent compounds, browning index, and color formation were measured in milk-based powdered infant formulas (IF) during 2 years of storage at 20 and 37 degrees C. The excitation spectra from 415 nm emission show three peaks (ex lambda(1) = 270 nm, lambda(2) = 325/315 nm, lambda(3) = 350 nm) and from 347 nm excitation two emission peaks (415 and 520 nm), and no wavelength shifts were observed. Temperature and time of storage exert in general no significant effect on the development of fluorescence emission intensity and browning index. However, an important increase in pentodilysine was recorded-probably because of the iron and ascorbic acid contents of the samples-as well as in browning index in adapted IF. In both IF a color increase (Delta E) throughout storage was observed, this increase being greater in samples stored at 37 degrees C than in those stored at 20 degrees C. The increase in color with time fitted a linear regression model. Color appeared to be an indicator of sufficient sensitivity to measure the effect of temperature or storage time.