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Chroma [(a*2 + b*2)1/2], that quantifies the intensity of color, is higher in the pasteurized orange juice (57.63 ± 0.55), followed by HIPEF juice (53.70 ± 0.57) and finally by the untreated juice (50.93 ± 0.69). A similar observation in increases in chroma (increases in brightness) due to the pasteurization of orange juice has been described by Lee and Coates (2003) and Sa′nchez-Moreno et al.(2005). During refrigerated storage of the samples analyzed in the present study, color intensity decrease because chroma (C*) decrease (Fig. 3). Other authors describe similar results after refrigerated storage of orange juice (Choi,Kim, & Lee, 2002) or after frozen storage of red grapefruit juice concentrates (Lee & Coates, 2002). Total color differences (DE), which indicate the magnitude of the color difference between orange juices at initial time and after the storage period, is shown in Table 2. It has been considered that DE of two would be a noticeable visual difference for a number of situations (Choi et al., 2002; Francis & Clydesdale, 1975). In all the cases DE values higher than 2 are obtained, although the orange juices stored at 10 C present higher color differences than the ones stored at 2 C, and the pasteurized orange juice always presents higher color differences than the juice treated by HIPEF (Table 2). When statistical analysis is applied, a positive correlation between browning index and CIE b* (r2 = 0.970; p = 0.001) and L* (r2 = 0.821; p = 0.045) is obtained, and contrary, there is a negative correlation between this index and CIE a* (r2 = 0.928; p = 0.008). These results indicate that when the juices get browned due to their deterioration, their color is more green and yellow but less red than the color of fresh orange juice. There are no correlations between these parameters and the HMF. |
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参考参考吧 色度[(A * 2 + b *表2)1/2],即量化颜色的强度,是在巴氏杀菌橙汁更高(57.63±0.55),随后HIPEF汁(53.70±0.57),最后通过与未处理果汁(50.93±0.69)。在增加色度类似的观察(增加亮度)由于橙汁的杀菌已经由Lee和科茨(2003)描述和Sa'nchez-Moreno等人(2005)。在冷藏储存在本研究中分析的样本,颜色强度下降,因为色度(C *)下降(图 3)。其他作者经过冷藏的橙汁(财金,与李,2002)或描述相似的结果后,红葡萄柚浓缩汁(李寇兹,2002)冷冻储藏。总的颜色差异(DE),这表明橙汁在初始时间及贮存期后之间的颜色差的大小,示于表2中,它已被认为是两个DE将是一些明显的视觉差异的情况下(Choi等,2002;。弗朗西斯&克莱兹,1975)。在所有的情况下,DE值大于2时得到,虽然保存在10桔子果汁4 C呈现比那些保存在2更高的颜色差异C,和巴氏杀菌橙汁总是呈现比由HIPEF处理的果汁较高的色彩差异(表2)。当统计分析应用,褐变指数和CIE B *之间存在正相关关系(R2 = 0.970,P = 0.001)和L *(R2 = 0.821,P = 0.045)得到的,相反,有这个呈负相关指数和CIE一个*(R2 = 0.928; p值= 0.008)。这些结果表明,当果汁得到焦黄由于其劣化,其颜色比新鲜的橙汁的颜色更绿,黄,但较少红色。有这些参数和HMF之间没有相关性。 |

2楼2014-04-18 23:54:25
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3楼2014-04-18 23:58:41
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4楼2014-04-19 00:31:12
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5楼2014-04-19 00:34:53
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