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云南普洱茶渥堆发酵过程关键控制因素分析 总被引：3，自引：0，他引：3
优质云南普洱茶是指以云南一定区域内种植的云南大叶种鲜叶制成的晒青毛茶及其压制茶在良好贮藏条件下长期贮存（10年以上）或云南大叶种晒青毛茶经人工渥堆发酵,使茶多酚、糖类等生化成分经氧化聚合水解等系列生化反应,最终形成具有条索肥壮紧实、色泽褐红（猪肝色）、陈香纯正、滋味醇厚回甘、汤色褐红透亮的品质特征,且质量卫生指标符合国家强制性标准要求的散状普洱茶产品或紧压茶产品。 相似文献
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普洱茶(熟茶)精制加工与压制过程控制因素分析 总被引：1，自引：0，他引：1
我国港澳、珠三角地区为传统普洱茶市场,以6~10级熟散茶为主,紧压茶为辅。散茶品质要求是外形条索粗壮肥大、完整,色泽褐红,具独特陈香,滋味醇厚回甜,精制加工方法比较简单。自1991年后普洱茶精制加工规范未经重新修正。随着普洱茶消费市场的扩大,对高级普洱茶及紧压茶产品需求大增。目前各茶厂的原料、设备、筛路及筛网组合不一,甚至同级不同质。因此,有必要对普洱熟茶精制加工工艺进行改进和规范。本文通过对普洱茶(熟茶)的精制加工流程及压制工艺相关技术要点的系统阐述,以进一步规范普洱茶(熟茶)的加工工艺,提升产品质量和质量安全管理水平,为生产者提供经验和参考。 相似文献
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普洱茶(生茶)紧压茶加工技术 总被引：1，自引：0，他引：1
《中国茶叶》2017,(12)
<正>普洱茶(生茶)紧压茶是以地理标志保护范围内的云南大叶种晒青茶为原料,并在地理标志保护范围内采用特定的精制蒸压成型、干燥等工艺制成,有圆饼形、碗臼形、方形、柱形等形状和规格,质量卫生指标符合国家强制性标准要求的紧压茶产品。其品质特征为:外形色泽墨绿,香气清纯持久,滋味浓厚回甘,汤色绿黄清亮,叶底肥厚黄绿。一、晒青茶精制1.晒青毛茶的收储管理初制或者收购的晒青毛茶入库归堆是在毛茶验收定级 相似文献
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本刊讯12月1日,《地理标志产品普洱茶》正式实施,其中对普洱茶的界定受到业界广泛的关注。依据《地理标志产品普洱茶》的界定,只有以地理标志保护范围内的云南大叶种晒青茶为原料,并在地理标志保护范围内采用特定的加工工艺制成的才能叫普洱茶。标准 相似文献
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普洱紧压茶是原产于我国云南的一类历史悠久的特种茶，为历史名茶，素来深得海内外广大嗜茶者所喜爱，在港、澳、台及东南亚市场上一直很受欢迎，近年来出口到日本、德、美等国，同样深受消费者所喜爱。历史上主要产地在今西双版纳、思茅和大理一带，从２０世纪７０年代开始，云南昆明、临沧等地及广东、广西也开始生产普洱紧压茶，８０年代以来，四川、湖南、贵州甚至越南、泰国等地也批量生产普洱紧压茶，对云南普洱紧压茶主产区的出口及销售构成了极大的威胁，为提高和改善云南普洱紧压茶的品质和质量，对云南普洱紧压茶的加工技术进行浅… 相似文献
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针对豫北地区的大豆生产现状，从气候、土壤、品种、生态因素及市场需求等方面提出了优质大豆的发展策略与途径。 相似文献
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Irrigation of Netted Gem potatoes was scheduled during three growing seasons by three methods: (a) when plants displayed first visual symptoms of moisture stress, (b) when indicated by a soil moisture budget involving estimated evapotranspiration, and (c) on the basis of tensiometer readings of soil moisture suction. When the tensiometer method of scheduling was used, the mean yields of tubers were 55.0 and 25.8 cwt/acre (6160 and 2890 kg/ha) higher than those obtained with the other two scheduling methods. Methods did not affect the specific gravity of potatoes. Method (a) scheduled irrigations least frequently. Scheduling by the budget method was not always adequate because it was based on the assumption that the crop extracted water from a constant 4 ft (1.2 m) profile from planting to full vegetative growth. In one year the budget method scheduled the first irrigation earlier than necessary and delayed the second irrigation during a critical period of crop growth. From full vegetative cover to harvest the irrigation schedules were alike for both the budget and tensiometer methods. 相似文献
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1 吉林省平安农业科学院大豆研究工作简介吉林省平安农业科学院大豆研究所 ,设在吉林省长春市西安大路种子大厦内。现有科技人员 6人 ,其中研究员 2人 ,农艺师 2人 ,技术员 2人 ,定向培养研究生 2人。大豆研究所的主要任务是选育稳产、高产、优质及抗病虫大豆新品种 ;同时密切 相似文献
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以长沙县高桥相同嫩度茶鲜叶原料采用卷曲形毛尖茶加工工艺制绿茶为对照,分别对沅陵县齐眉翠峰、凤娇碣滩茶、干发茶和军大坪茶4种绿茶的主要生化成分与感官品质进行初步分析。结果表明,沅陵4种绿茶的茶多酚总量28.76%~30.34%,游离氨基酸总量2.35%~3.22%,咖啡碱含量3.00%~3.63%,水浸出物含量37.26%~40.07%,可溶性糖总量5.46%~5.65%,可溶性蛋白含量1.50%~1.74%,类黄酮化合物总量1.16%~1.79%,叶绿素总量1.36%~2.01%,儿茶素总量13.53%~16.20%。与对照相比,4种绿茶的茶多酚、可溶性糖和儿茶素总量均高于对照,除齐眉翠峰外其余3种茶样水浸出物和叶绿素总量均高于对照,除干发茶外其余3种茶样类黄酮化合物总量均高于对照。 相似文献
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Sena L.P. VanderJagt D.J. Rivera C. Tsin A.T.C. Muhamadu I. Mahamadou O. Millson M. Pastuszyn A. Glew R.H. 《Plant foods for human nutrition (Dordrecht, Netherlands)》1998,52(1):17-30
In the western Sahel, indigenous plants become important staples when cereal harvests are inadequate to support populations inhabiting that region of Africa. The purpose of this study was to assess the nutrient content of several of these edible wild plants. The leaves of the following seven plant foods were analyzed: Ziziphus mauritiana, Cerathotheca sesamoides, Moringa oleifera, Leptadenia hastata, Hibiscus sabdarifa, Amaranthus viridi, and Adansonia digitata. The fatty acid, vitamin E, carotenoid, selected mineral and amino acid contents of these plant foods were determined. These same analyses were performed on the fruit of the Adansonia digitata. In quantitative and qualitative terms, Amaranthus viridis was found to be an excellent source of protein. Its amino acid composition compared favorably to that of a World Health Organization (WHO) protein standard. It also contained considerable amounts of the two fatty acids that are essential in humans (linoleic and -linolenic) and a number of minerals including iron, magnesium, calcium and zinc. The leaves of Hibiscus sabdarifa contained an appreciable quantity of protein the composition of which was comparable to the WHO standard. The mineral content of the leaves of this plant was also exceptionally high; noteworthy was its high zinc content. H. sabdarifa also contained significant quantities of the two essential fatty acids. Ziziphus mauritiana was an excellent source of the essential fatty acid linoleic acid and several of the metals including iron, calcium, magnesium and zinc. Its content of other essential nutrients, however, was rather low. In general, Adansonia digitata leaves were nutritionally superior to the fruit of the tree; however, the fruit did contain useful quantities of potassium, phosphorus, zinc and -linolenic acid. The Leptadenia hastata leaves were an especially good source of lutein and -carotene. These data should be useful to the people who inhabit the western Sahel in helping them devise healthy diets during times when cereal staples are in short supply. 相似文献
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通过电解质外渗法和匍匐茎恢复试验对‘阳江’狗牙根及其12个通过形态鉴定选出的坪用价值高且花序密度低的诱变后代进行抗寒性鉴定。电解质外渗法结果表明:诱变后代间的抗寒性具有较大差异,其叶片半致死温度(LT50)的变异范围为-7.6～-0.2℃(最低值与最大值相差7.4℃);参试材料抗寒性由强到弱依次为M18>M4>M26>M28> M22>阳江>M29>M31>M10>M37>M16>M1>M25,其中,有5个诱变后代抗寒性优于亲本,分别是M18、M4、M26、M28、M22。匍匐茎恢复实验结果表明:诱变后代M1、M22、M26、M31、M25在0℃和-5℃低温胁迫后的恢复生长率都高于亲本,恢复能力均优于亲本;M10、M37、M28在-5℃低温胁迫下,恢复生长能力低于亲本,抗寒性相对较弱,M16和M4在0℃和-5℃低温胁迫下,恢复生长率都低于亲本,抗寒性明显弱于亲本。综合2种方法鉴定结果显示:诱变后代M1、M25的恢复能力较强;M4、M28的叶片抗寒性较好,青绿期较长;M22、M18、M26的叶片抗寒性和匍匐茎恢复能力均较强;M29,M31的叶片抗寒性和匍匐茎恢复能力与亲本相似;M10、M16、M37的叶片抗寒性和匍匐茎恢复能力均较弱,整体抗寒性较弱。 相似文献
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