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本实验采用感官审评和仪器分析方法,对铜仁市野生、古茶树茶的感官、理化品质进行分析。结果表明:古茶树绿茶、红茶和野生绿茶感官品质有一定差异。古茶树绿茶外形呈兰花形、扁平,香气有板栗香,滋味较浓带苦涩;野生绿茶外形条索疏松、卷曲,香气是高火香,滋味尚浓醇;古茶树红茶外形乌褐色、汤色红亮,香气高甜香,口感醇和。三种茶叶感官品质正常,外形及内质较好。野生茶和古茶树茶的化学成分分析,水分、水浸出物含量符合国标,茶多酚、氨基酸、咖啡碱、可溶性糖含量均较符合要求。结论:野生与古茶树茶叶品质各有特色,野生茶树茶滋味甘甜鲜爽,口感平和;古茶树茶滋味浓烈,口感较涩。本研究为选育我市茶树新品种具有重要意义。 相似文献
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云南特有的藤条茶,源于当地茶农在长期生产中创造的一种独特留采法,因能促使茶树树干形似藤条而得名。为探究藤条茶留采管理模式对茶叶品质的影响,选取藤条茶园一芽二叶鲜叶制作晒青茶、红茶、白茶,以现代茶园同类鲜叶制样为对照,结合感官审评和品质化学成分进行分析。研究表明,采用藤条茶树鲜叶制成的晒青茶一般具有更高爽的香气和浓醇的滋味,白茶则具有更浓郁的香气及甘和的滋味,而现代茶园红茶一般具有更高甜的香气和甘爽的滋味。藤条茶的儿茶素总量均显著低于现代茶园茶树鲜叶,尤其是藤条白茶中的儿茶素总量为67.11 mg·g-1,显著低于现代茶园白茶(84.19 mg·g-1)。藤条晒青茶中的茶氨酸含量为16.79 mg·g-1,显著高于现代茶园晒青茶(14.69 mg·g-1)。藤条晒青茶和藤条白茶具有更低的酚氨比。在所有茶样中共鉴定出205个初级代谢产物,藤条白茶中积累更丰富的糖类。此外,在所有茶样中检测出127种挥发性物质,醇类和酯类是不同茶样中主要的挥发性成分,藤条白茶中挥发物总量显著高于现代茶园白茶;藤条红茶中香叶... 相似文献
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湖南3种特色资源(品种)工夫红茶品质比较分析 总被引：1，自引：0，他引：1
选用汝城白毛茶、保靖黄金茶和槠叶齐茶树鲜叶原料,采用传统红茶加工工艺制作工夫红茶,分别进行感官审评及测定主要品质与香气成分。结果表明:3种工夫红茶品质各异,其中汝城白毛茶红茶芽头肥壮,金毫满披,花香持久,汤色红浓,滋味浓强回甘;保靖黄金茶红茶棕褐色尚润,金毫多,汤色红亮,香气尚持久带花香,滋味醇和鲜爽;槠叶齐品种红茶紧细,乌黑油润,显金毫,汤色红浓、亮,香气甜香、尚浓,滋味浓强回甘。生化检测表明:保靖黄金茶红茶氨基酸含量最高(6.18%),汝城白毛茶红茶茶多酚含量最高(18.49%),槠叶齐品种红茶可溶性糖含量最高(2.43%);3种红茶香气物质均以醇类、醛类与水杨酸甲酯含量为主,其中保靖黄金茶红茶醇类含量最高(65.92%),汝城白毛茶红茶含量最低(37.62%);基于香气成分分析,建立了3个品种(株系)的鉴别模型。 相似文献
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《茶叶通讯》2020,(2)
茶叶感官审评是评价茶叶品质最普遍、最直观的方式,电子鼻也被广泛应用于茶叶香气物质的分析。本试验采用电子鼻技术对凤庆县49个滇红茶的香气进行检测,结合感官审评评分,通过WinMuster、SPSS 22软件对检测数据进行分析,得到凤庆滇红茶的香气物质特征以及电子鼻与感官审评的相关系数。结果显示,各茶样间叶底法的判别效果优于干茶法和茶汤法。茶汤法与叶底法的G/G_0响应值明显高于干茶法,三种香气采集方式均为硫化物类、氮氧化合物、芳香成分有机硫化物、甲基类、醇醛酮类响应值最大,变化最明显,且古树红和野生红茶的响应值较其他红茶高。感官审评中工夫红茶各茶样间的评分差异较大,而名优滇红茶大部分茶样间的评分差异较小,这与电子鼻检测结果相一致。感官审评中香气和滋味的评分呈极显著正相关,叶底法与茶汤法中部分传感器与感官评分呈显著正相关,但干茶法与感官评分的相关性不显著。电子鼻技术与茶叶感官审评具有一定的相关性,两者相结合对茶叶香气的评价与鉴别具有重要意义。 相似文献
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歌乐茶是福鼎市茶业局选育的茶树优良品种,2011年通过省级优良茶树品种审定。本文介绍了以歌乐茶树品利加工白琳工夫红茶的工艺及品质特征,通过感官审评对比结果表明,以歌乐茶加工的白琳工夫红茶具有条索细紧重实、芽毫显、乌润,香气高甜浓郁,伴有花果香,滋味鲜甜爽口有回甘,汤色桔红明亮,叶底肥壮嫩匀、明亮等品质特征,达到优质白琳工夫红茶标准,具有较大的生产潜力和广阔的市场前景。 相似文献
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为了充分挖掘利用武夷名丛资源、丰富红茶品类,以水仙为对照,对13个武夷名丛分别蒸青固样、加工红茶。通过生化成分检测和感官审评,分析其红茶适制性,并对鲜叶生化成分与红茶品质相关性进行分析。结果表明：‘鬼洞白鸡冠’鲜叶水浸出物、氨基酸、咖啡碱、黄酮,红茶水浸出物、茶多酚、咖啡碱、黄酮、茶黄素、茶红素等含量均超过对照,其中茶黄素含量为0.81%,显著高于对照,且感官审评品质优异。综合生化成分检测和感官审评结果得出,‘鬼洞白鸡冠’、‘金锁匙’、‘金凤凰’、‘白毛猴’、‘雀舌’适制红茶。鲜叶酚氨比与红茶品质未发现显著相关性。鲜叶水浸出物、咖啡碱、酚咖比和氨咖比与红茶品质或重要影响因子呈显著相关,可为茶树种质红茶适制性提供一定的参考依据。 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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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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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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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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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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M. D. Harrison Gestur Johnson R. D. Barmington 《American Journal of Potato Research》1970,47(10):386-393
A broadcast application of PCNB (Terraclor) resulted in a reasonably uniform distribution of the chemical in the soil with the concentration decreasing in a linear fashion with increasing depth in the soil profile. A banded application resuluted in a considerably higher chemical concentration at the 4–6 inch depth than at the 0–2 or the 2–4 inch depths. The problem of the lack of uniformity of chemical distribution could probably be solved by altering nozzle placement and size and allow use of the band method of application to minimize grower cost. More complete disking in the case of the broadcast treatment would probably result in a relatively uniform distribution of the chemical but at higher cost to the grower. PCNB application rates of 10, 15 and 25 lbs per acre broadcast and 71/2, 10 and 121/2 lbs per acre in a band significantly reduced the severity ofRhizoctonia infection of Russet Burbank potatoes but did not increase potato yields significantly. 相似文献
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P. Mésochina W. Martin-Rosset † J.-L. Peyraud ‡ P. Duncan § D. Micol† S. Boulot¶ 《Grass and Forage Science》1998,53(2):189-196
Data from in vivo digestibility trial with four to six horses fed twenty-seven forage-based diets are used to calculate prediction equations for the digestibility of dry and organic matter, based on the crude ash (CA), crude protein (CP) and crude fibre (CF) contents of diets and faeces. The most precise prediction of dry-matter digestibility (r.s.d. = 0.032, R2= 0.80) was derived from a multiple regression including faecal (CP, CF) and dietary parameters (CF). Among faecal parameters, CP was the best single predictor of both digestibility (r.s.d) = 0.040, r2= 0.63) and dietary CP content (r.s.d = 0.028, r2= 0.59). For biological reasons we propose a non-linear model that allows prediction of dry- and organic-matter digestibility from faecal CP Content with reasonable Precision (r.s.d = 0.038, 0.036, r2= 0.65, 0.74, respectively). This will be adequate for many studies, especially for free-living animals in rangelands. 相似文献
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橡胶树丛枝病病原的抗血清制备与应用 总被引：5，自引：1，他引：4
以感染橡胶树丛枝病病原的长春花为材料,制备得到橡胶丛枝病病原菌抽提液,以抽提液为抗原免疫家兔,制备抗血清,经微量沉淀测定,抗血清效价为１：２０４８。应用橡胶丛枝病抗血清检测橡胶褐皮病,无症苗木检出率达３０％－３７％,可疑的褐皮病树检出率达８５．７％。 相似文献