摘要
通过测定8种工夫红茶样品的色素含量、茶汤色差参数值,并与感官审评评分相结合,研究不同色素含量的红茶与茶汤色差参数值的差异性,及其与感官审评评分之间的相互关系,从而探索以茶汤色差对红茶品质进行有效判别的方法。结果表明,红茶色素含量与感官品质审评评分呈二次相关关系(y=-0.7123x2+115.16x-4635.1);感官品质审评评分与茶汤明亮度表征量"L"值呈极显著负相关,与红绿色度表征量"a"值、黄蓝色度表征量"b"值、色度值表征量"Cab"值、色彩饱和度表征量"Sab"值、色差值表征量"ΔE"值呈极显著或显著正相关;茶汤明亮度表征量"L"值、色相角表征量"Hab"值与红茶色素TR、TF呈正相关,与TB呈负相关;红绿色度表征量"a"值、黄蓝色度表征量"b"值、色度值表征量"Cab"值、色差值表征量"ΔE"值与红茶色素TR、TB呈正相关,与TF呈负相关;色彩饱和度表征量"Sab"值与红茶色素TB呈正相关,与TR、TF呈负相关;红茶色素TB与"L"值呈显著负相关,与"a""Sab"值呈显著正相关。因此,用色差参数L、a、b、Cab、Sab、ΔE来反映红茶品质是可行的。
In order to explore an effective method for the distinguishing of black tea quality according to chromatism parameters of tea soup, we determined the pigment contents, tea soup chromatism parameters and sensory quality of eight kinds of congou black tea samples, and studied the correlations among them. The results indicated that there existed a quadratic curve relationship between pigment contents and sensory quality score of black tea （y = - 0. 7123x2 ＋ 115.16x - 4635.1 ）. The score of sensory quality evalua- tion of black tea was significantly negatively correlated with the brightness L - value of tea soup （P 〈 0.01 ）, and was significantly positively correlated with red - green chroma a - value, yellow - blue chroma b - value, chroma Cab - value, color saturation Sab - value, and chromatism △E - value （P 〈0.01 or P 〈0.05）. L - value and hue angle Hab - value of tea soup were positively corre- lated with pigments TR and TF of black tea, and negatively correlated with TB. The values of a, b, Cab and AE were positively cor- related with TR and TB, while were negatively correlated with TF. There was a positive correlation between Sab and TB, and a neg- ative correlation between Sab and TR, TF. Pigment TB had a significantly negative correlation with L - value, and a significantly positive correlation with a - value, Sab - value. Thus, it is feasible to evaluate the quality of black tea by using the chromatism pa- rameters L, a, b, Cab, Sab and △E of tea soup.
出处
《江西农业学报》
CAS
2014年第5期47-50,54,共5页
Acta Agriculturae Jiangxi
关键词
工夫红茶
红茶色素
茶汤色差
感官品质
Congou black tea
Pigment
Tea soup chromatism
Sensory quality
