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KMID : 0380619850170060426
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Korean Journal of Food Science and Technology
1985 Volume.17 No. 6 p.426 ~ p.430
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Visual Color Deterioration of the Extract of Lithospermi radix
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김호/Kim, H
유무영/윤희남/신용달/Yoo, M Y/Yoon, H N/Shin, Y D
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Abstract
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The effects of temperature on the visual color deterioration of Lithospermi radix were investigated under steady conditions of various pH and temperature. The changes of Hunter L, a, b, and △E values related to the color deterioration were sharply increased above 50℃ and the deteriorations were expressed linear relationships with the temperature above 60℃. Linear regression coefficients of Hunter L, a, b values decreased with an increase of heat treatment time, whereas the color difference was increased. The linear regression coefficients of Hunter L, a, b, △E values in 66.7% ethanol extract solution of Lithospermi radix for 1 hr were -0.3696, -0.4124, -0.2279, and 0.5983, respectively. Inear regression coefficients in color difference (△E) could be calculated from the coefficients in Hunter L, a, b values. The low pH treatment of extract from pH 6.07 to pH 1.35 led to decrease of Hunter a value and a little increase of Hunter L, b values, but the high pH treatment above pH 6.07 decreased all Hunter values. Particularly, the visual color of the extract of Lithospermiradix was appeared to be faborable at pH 4.0-6.5, which was a bright red color.
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