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茶汁蒸发浓缩和膜分离浓缩工艺对品质影响的比较研究 总被引:5,自引:0,他引:5
对茶汁蒸发浓缩和膜分离浓缩工艺对品质影响进行了比较。对两种工艺制取的茶汁成分进行了分析。取得的数据可用于指导茶饮料的生产。 相似文献
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《食品科学》1999,20(10):46-47
近年来,各种风味的液态茶饮料大量在市场上出现,并日益受到消费者的喜爱。但绝大多数厂家茶饮料的生产工艺中仍采用茶浸提或直接使用速溶茶进行调配的方式。现以膜浓缩茶计为原料,研究其制备的茶饮料在风味、澄清性、过滤等方面的优缺点。1材料及方法1.1材料1.1.1茶叶:市售绿碎茶、红碎茶、乌龙茶。1.1.2浓缩汁:潮阳华城食品有限公司采用低温膜浓缩技术生产的绿茶、乌龙茶、红茶膜浓缩茶汁,浓度20%.1.1.3速溶茶粉:绿茶、乌龙茶、红茶喷干速溶茶粉。1.1.4添加剂:异维生素C钠,食用级。1.2方法1.2.1工艺流程(1)干茶制备茶饮料工艺流程绿碎、乌龙茶、红碎茶→浸提→冷却→粗滤→调配→过滤→灌装封口 相似文献
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茶汁蒸发浓缩和膜分离浓缩工艺对茶汁品质影响的比较研究 总被引:1,自引:0,他引:1
通过对蒸发浓缩和膜分离浓缩所生产茶汁中化学成分研究, 结果表明膜分离浓缩所生产茶汁品质显著高于传统蒸发热浓缩工艺生产茶汁。 相似文献
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乌龙茶汁的浓缩工艺对其香气成分的影响 总被引:2,自引:0,他引:2
以乌龙茶为原料 ,乌龙茶的浸提液 2 # 为参照 ,采用GC MS方法来分析其膜浓缩产品3# 和真空减压浓缩产品 1# 中香气成分的种类、数量及含量的差别。感官评定进一步证明 ,膜浓缩工艺对乌龙茶香气成分的损失小 相似文献
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Maria J. Muthuiah Jibu Thomas Rajagopal Raj Kumar & Abul K. Azad Mandal 《International Journal of Food Science & Technology》2009,44(10):2070-2074
Green tea is proved to be a source of various biochemicals, which projects tea to be a health drink. The study investigated free radical scavenging activity of leaf extracts of south Indian tea clones, individual catechin molecules and documented the influence of various additives on the scavenging activity of black tea infusion. Among the tea clones, UPASI-17 contained higher quantum of catechins. Lower content of catechins correlated with low 1,1-diphenyl-2-picrylhydrazyl and hydroxyl scavenging activities. Low scavenging activity was noticed in gallocatechin. A wide variation was found in free radical scavenging activity of individual molecules, leaf extracts, tea liquor and its combination with the additives. Tea liquor along with lemon juice showed the highest free radical scavenging activity. When sugar and lemon juice were amended with tea liquor, free radical scavenging activity declined marginally. Addition of milk and sugar with tea liquor declined the free radical scavenging activity significantly. 相似文献
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《Food chemistry》2002,76(4):483-489
The metal content of several tea beverages, infusions, instant and tea soft drinks was determined. Eleven metals Al, Ba, Ca, Cu, Fe, K, Mg, Mn, Na, Sr and Zn were determined by inductively coupled plasma atomic emission spectrometry (ICP–AES). A study of the differences in the metal contents of tea beverages has been carried out. Pattern recognition techniques such as principal components analysis and linear discriminant analysis were used to discriminate between the tea beverages. The metal intake related to tea consumption has also been studied. 相似文献
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K. S. Jagannatha Rao 《Molecular nutrition & food research》1994,38(5):533-537
Aluminium content of tea leaves has been engaging the attention during recent years because of its uptake in the form of beverages such as tea. Hence, data were generated on the Al content in tea and its infusions, using an inductively coupled plasma spectrometer. The average values of Al in fresh tea leaves and commercial tea powders were 250 and 325 μg/g dry wt, respectively. Tea infusions contained 20–80 μg/g of Al. Al complexes with tea components like tannic acid and theoflavins were studied and stability characteristics as well as the nature of the complexes were computed. 相似文献
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绿茶饮料加工过程中香气变化的研究 总被引:2,自引:0,他引:2
对绿茶饮料加工过程中各个工艺的茶叶香气变化进行了研究,分析了各种香气的变化情况,并利用香气指数分析了香气变化对茶饮料品质的影响。 相似文献
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对不同绿茶、红茶、乌龙茶和黑茶4种茶类茶汤的pH进行了测定,结果表明,不同茶叶的酸碱性有所不同。绿茶酸性最弱,红茶酸性最强,青茶和普洱茶酸性介于中间,但都为弱酸性,说明茶汤酸碱度与茶叶种类和制作方法有关。 相似文献
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茶饮料滋味独特、文化底蕴深厚且营养成分丰富,广受消费者的青睐,是世界上仅次于水的第二大饮料。汤色是评价茶饮料品质好坏的重要指标。不同类型的茶饮料呈现出不同的色泽,茶汤色泽的呈现是茶汤中各种物质综合作用的结果,这些物质主要包括儿茶素类、黄酮醇及其苷类以及花青素等,除此之外还有一些脂溶性色素。茶汤色泽劣变主要是由于这些物质易受茶饮料加工与贮藏条件的影响,从而发生一系列反应生成有色物质,致使茶汤变黄、变红、变褐。茶饮料色泽的劣变是制约该产业发展的主要瓶颈之一。本文从茶饮料中主要呈色物质及其在加工贮藏过程中的变化规律入手,对茶饮料色泽劣变机理和护色技术进行概括总结,旨在为茶饮料护色技术研发提供理论参考。 相似文献
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茶饮料滋味独特、文化底蕴深厚且营养成分丰富,广受消费者的青睐,是世界上仅次于水的第二大饮料。汤色是评价茶饮料品质好坏的重要指标。不同类型的茶饮料呈现出不同的色泽,茶汤色泽的呈现是茶汤中各种物质综合作用的结果,这些物质主要包括儿茶素类、黄酮醇及其苷类以及花青素等,除此之外还有一些脂溶性色素。茶汤色泽劣变主要是由于这些物质易受茶饮料加工与贮藏条件的影响,从而发生一系列反应生成有色物质,致使茶汤变黄、变红、变褐。茶饮料色泽的劣变是制约该产业发展的主要瓶颈之一。本文从茶饮料中主要呈色物质及其在加工贮藏过程中的变化规律入手,对茶饮料色泽劣变机理和护色技术进行概括总结,旨在为茶饮料护色技术研发提供理论参考。 相似文献