A Quantitative Method for Brightness Evaluation of Congou Black Tea Infusions Based on Color Difference Analysis

WANG Jiaqin; YAO Yuefeng; YUAN Haibo; JIANG Yongwen; LI Jia

doi:10.13305/j.cnki.jts.2020.02.012

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Journal of Tea Science ›› 2020, Vol. 40 ›› Issue (2) : 259-268. DOI: 10.13305/j.cnki.jts.2020.02.012

A Quantitative Method for Brightness Evaluation of Congou Black Tea Infusions Based on Color Difference Analysis

WANG Jiaqin^1,2, YAO Yuefeng^1,2, YUAN Haibo^1*, JIANG Yongwen¹, LI Jia^1*

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Abstract

The brightness of tea infusion is one of the important factors reflecting the quality of black tea. At present, the evaluation of the brightness of tea infusion is dependent on the human sensory evaluation, which lacks a quantitative assessment. In this study, based on the brightness of the infusions obtained by the sensory evaluation, 43 congou black tea infusions with different brightness were measured using color difference analysis in combination with multivariate analysis and linear regression, and an equation for brightness prediction was established. The results show that bright and dark black tea infusions could be discriminated based on their color difference profiles in combination with principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA). Based on linear regression, the key variables L99 (lightness) and C* (chroma) were selected and the established prediction equation was L_pre=-46.028+0.519×L99+0.117×C^*. It was revealed that, the predicted brightness showed high correlation with that obtained by human sensory evaluation with the Pearson correlation of 0.92 (P<0.01). Besides, the effectiveness of established prediction equation for quantitative evaluation of tea infusion brightness had been further proved using validation set. In summary, in this study, a rapid and effective method based on color difference analysis and multi statistical approaches was developed which enabled quantitative evaluation of the brightness of black tea infusions. This study could provide new insights into the intelligent evaluation of black tea quality, as well as oriented manufacture of highly-bright black tea.

Key words

color difference analysis / Congou black tea / multivariate analysis / tea infusion brightness

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WANG Jiaqin, YAO Yuefeng, YUAN Haibo, JIANG Yongwen, LI Jia. A Quantitative Method for Brightness Evaluation of Congou Black Tea Infusions Based on Color Difference Analysis[J]. Journal of Tea Science. 2020, 40(2): 259-268 https://doi.org/10.13305/j.cnki.jts.2020.02.012

References

[1] 范捷, 王秋霜, 秦丹丹, 等. 红茶品质及其相关生化因子研究进展[J]. 食品科学, 2020, 41(3): 246-253.
Fan J, Wang Q S, Qin D D, et al.A study on the process of black tea quality and related biochemical factors[J]. Food Science, 2020, 41(3): 246-253.
[2] 姚月凤, 王家勤, 滑金杰, 等. 电子舌在工夫红茶甜纯滋味特征评价中的应用[J]. 食品科学, 2019, 40(18): 236-241.
Yao Y F, Wang J Q, Hua J J, et al.Application of electronic tongue in the evaluation of sweet taste quality of Congou black tea[J]. Food Science, 2019, 40(18): 236-241.
[3] 全国茶叶标准化技术委员会. 茶叶感官审评方法: GB/T 23776—2018[S]. 北京: 中国标准出版社, 2018.
National Technical Committee 339 on Tea of Standardization Administration of China. Methodology of sensory evaluation of tea: GB/T 23776—2018 [S]. Beijing: Standards Press of China, 2018.
[4] 高学玲, 张晶晶, 王玉婉, 等. 高亮度速溶红茶工艺优化[J]. 中国食品学报, 2016, 16(2): 106-109.
Gao X L, Zhang J J, Wang Y W, et al.Process optimization of high-polished instant black tea[J]. Journal of Chinese Institute of Food Science and Technology, 2016, 16(2): 106-109.
[5] 朱珺语, 倪德江, 曲凤凤, 等. 宜昌红茶品质与加工现状调查[J]. 中国茶叶加工, 2018(1): 38-43.
Zhu J Y, Ni D J, Qu F F, et al.Investigation on quality and processing status of Yichang black tea[J]. China Tea Processing, 2018(1): 38-43.
[6] 张颖彬, 刘栩, 鲁成银. 中国茶叶感官审评术语基元语素研究与风味轮构建[J]. 茶叶科学, 2019, 39(4): 474-483.
Zhang Y B, Liu X, Lu C Y.Study on primitive morpheme in sensory terminology and flavor wheel construction of Chinese tea[J]. Journal of Tea Science, 2019, 39(4): 474-483.
[7] Hilton P J, Ellis R T.Estimation of the market value of Central African tea by theaflavin analysis[J]. Journal of the Science of Food and Agriculture, 1972, 23(2): 227-232.
[8] Wright L P, Mphangwe N I K, Nyirenda H E, et al. Analysis of the theaflavin composition in black tea (Camellia sinesis)for predicting the quality of tea produced in Central and Southern Africa[J]. Journal of the Science of Food and Agriculture, 2002, 82(5): 517-525.
[9] 钱婉婷, 苏云娇, 张豪杰, 等. 不同水质特性及对茶类感官品质和L*a*b*色泽的影响[J]. 食品安全质量检测学报, 2018, 9(2): 324-330.
Qian W T, Su Y J, Zhang H J, et al.Properties of water and its effects on tea sensory quality and L*a*b*[J]. Journal of Food Safety & Quality, 2018, 9(2): 324-330.
[10] 张颖彬, 刘栩, 鲁成银. 中国茶叶感官审评术语的形成与发展现状[J]. 茶叶科学, 2019, 39(2): 123-130.
Zhang Y B, Liu X, Lu C Y.Formation and development of Chinese tea sensory terminology[J]. Journal of Tea Science, 2019, 39(2): 123-130.
[11] 戴前颖, 夏涛, 朱博, 等. 绿茶提取液中脂溶性色素对汤色的影响[J]. 安徽农业大学学报, 2010, 37(3): 459-464.
Dai Q Y, Xia T, Zhu B, et al.Effect of lipid-soluble pigments on color of green tea infusion[J]. Journal of Anhui Agricultural University, 2010, 37(3): 459-464.
[12] 刘洪林. 工夫红茶品质客观评价研究[D]. 重庆: 西南大学, 2015.
Liu H L.Congou objective evaluation of quality [D]. Chongqing: Southwest University, 2015.
[13] 陆建良, 梁月荣, 龚淑英, 等. 茶汤色差与茶叶感官品质相关性研究[J]. 茶叶科学, 2002, 22(1): 57-61.
Lu J L, Liang Y R, Gong S Y, et al.Studies on relationship between liquor chromaticity and organoleptic quality of tea[J]. Journal of Tea Science, 2002, 22(1): 57-61.
[14] 吴昊玥, 潘科, 陈贤明, 等. 八种工夫红茶的茶汤色泽与感官品质之间的相关性分析[J]. 贵州茶叶, 2015, 43(4): 22-25.
Wu H Y, Pan K, Chen X M, et al.Studies on correlation between tea soup color difference and quality evaluation of the congou black tea[J]. Journal of Guizhou Tea, 2015, 43(4): 22-25.
[15] 杨娟, 袁林颖, 钟应富, 等. 工夫红茶色泽与品质相关性研究[J]. 西南农业学报, 2014, 27(6): 2605-2610.
Yang J, Yuan L Y, Zhong Y F, et al.Study on correlations between color and quality of congou made of different varieties of tea[J]. Southwest China Journal of Agricultural Sciences, 2014, 27(6): 2605-2610.
[16] Laddi A, Prakash N R, Sharma S, et al.Discrimination analysis of Indian tea varieties based upon color under optimum illumination[J]. Journal of Food Measurement and Characterization, 2013, 7(2): 60-65.
[17] Laddi A, Prakash N R, Sharma S, et al.Significant physical attributes affecting quality of Indian black (CTC) tea[J]. Journal of Food Engineering, 2012, 113(1): 69-78.
[18] Panigrahi N, Bhol C S, Das B S.Rapid assessment of black tea quality using diffuse reflectance spectroscopy[J]. Journal of Food Engineering, 2016, 190: 101-108.
[19] Roberts E S R. The phenolic substances of manufactured tea. IX.—the spectrophotometric evaluation of tea liquors[J]. Journal of the Science of Food and Agriculture, 1963, 14(10): 689-700.
[20] Samanta T, Cheeni V, Das S, et al.Assessing biochemical changes during standardization of fermentation time and temperature for manufacturing quality black tea[J]. Journal of Food Science and Technology-Mysore, 2015, 52(4): 2387-2393.
[21] Zhang X K, He F, Zhang B, et al.The effect of prefermentative addition of gallic acid and ellagic acid on the red wine color, copigmentation and phenolic profiles during wine aging[J]. Food Res Int, 2018, 106: 568-579.
[22] 李运奎, 韩富亮, 张予林, 等. 基于CIELAB色空间的红葡萄酒颜色直观表征[J]. 农业机械学报, 2017, 48(6): 296-301.
Li Y K, Han F L, Zhang Y L, et al.Visualization for representation of red wine color based on CIELAB color space[J]. Transactions of the Chinese Society for Agricultural Machinery, 2017, 48(6): 296-301.
[23] Karamucki T, Rybarczyk A, Jakubowska M, et al.A comparison of two methods of determining colour change in the assessment of the quality of pork[J]. Acta Scientiarum Polonorum-Technologia Alimentaria, 2017, 16(3): 321-329.
[24] Mollov P, Mihalev K, Shikov V, et al.Colour stability improvement of strawberry beverage by fortification with polyphenolic copigments naturally occurring in rose petals[J]. Innovative Food Science and Emerging Technologies, 2007, 8(3): 318-321.
[25] 成洲, 廖茜, 姚逸. 几种工夫红茶的茶汤色泽与感官品质之间的相关性[J]. 天津农业科学, 2014, 20(3): 71-75.
Cheng Z, Liao Q, Yao Y.Correlation between tea soup color difference and quality evaluation of the congou black teas[J]. Tianjin Agricultural Sciences, 2014, 20(3): 71-75.
[26] 雷用东, 邓小蓉, 罗瑞峰, 等. 3种颜色体系在食品应用中的研究进展[J]. 食品科学, 2016, 37(1): 241-246.
Lei Y D, Deng X R, Luo R F, et al.Progress in the application of three types of color system in color measurement of foods[J]. Food Science, 2016, 37(1): 241-246.
[27] 徐吉祥, 楚炎沛. 色差计在食品品质评价中的应用[J]. 现代面粉工业, 2010, 24(3): 43-45.
Xu J X, Chu Y P.Application of color difference meter in food quality evaluation[J]. Modern Flour Milling Industry, 2010, 24(3): 43-45.
[28] 刘千录. 影响红茶汤色的主要色素研究[D]. 北京: 中国农业科学院, 2015.
Liu Q L.Research of main tea pigment affecting black tea color [D]. Beijing: Chinese Academy of Agricultural Sciences, 2015.
[29] Gómez-POLO C, Gómez-POLO M, Viñuela A C, et al.A clinical study relating CIELCH coordinates to the color dimensions of the 3D-Master System in a Spanish population[J]. The Journal of Prosthetic Dentistry, 2015, 113(3): 185-190.
[30] 王银诚. 基于电子舌技术评价宜红工夫茶滋味品质的研究[D]. 北京: 中国农业科学院, 2017.
Wang Y C.Study on the taste quality of Yichang congou black tea based on electronic tongue technology [D]. Beijing: Chinese Academy of Agricultural Sciences, 2017.
[31] Trygg J, Holmes E, Lundstedt T.Chemometrics in Metabonomics[J]. Journal of Proteome Research, 2007, 6(2): 469-479.
[32] 汪哲弘. 颜色视觉辨别特性及色差评价研究[D]. 杭州: 浙江大学, 2009.
Wang Z H.Study of color vision discrimination characteristics and color-difference evaluation [D]. Hangzhou: Zhejiang University, 2009.