Effect of Seasons on Theanine Levels in Different Kenyan Commercially Released Tea Cultivars and Its Variation in Different Parts of the Tea Shoot

A study was conducted to determine the effect of seasons in 23 different Kenyan commercially released tea cultivars. This was done for three seasons viz: cold and wet, cold and humid, hot and dry. The cold and wet season was shown to be the best for obtaining high levels of theanine while the hot and dry season resulted in decrease in theanine levels in most of the test cultivars thus showing seasonal variation on the levels of theanine. Theanine content was determined using High Performance Liquid Chromatography (HPLC). On average, TRFK 31/8 contained 1.20% dw of theanine and highest in green tea while TRFK 56/89 contained 0.97% dw of theanine and highest in black tea. Green tea contained higher theanine levels than black tea and this has been shown in most of the test cultivars. To achieve the health benefits of theanine, one should drink 4 cups of tea brewed from cultivars with 0.63% dw and more of theanine. Also theanine levels were determined in the different partitions of the tea shoot (4 leaves + bud) and the internode contained the highest theanine levels up to 3.26% dw for both cultivars compared to the leafy partitions.

Evaluation of Flowering Pattern, Yield and Yield Determinants of Hybrid Tea Rose in Response to Seasonal Variations and Applied Organic Manure Rates

Seasonal variations in environmental conditions can have significant influence on flowering pattern and yield of roses. Evaluation studies were conducted to determine the flowering pattern and yield determinants of two Hybrid Tea rose cultivars in response to seasonal variations under rain-fed conditions. The 2 × 2 × 4 factorial experiment arranged in split plot design at three replications was conducted at two seasons (dry and wet) using two cultivars (cv. “Immaculate” and “P.H. Baby”, white and red flowers respectively) supplied with poultry manure (PM) application rates at 5, 10 and 20 t/ha where the unfertilized (0 t/ha) served as control. The result showed that the year two environmental conditions of both experiment I and II significantly improved plant height, number of leaves, number of buds (CNB) and opened flowers (CNF) and flower yield (FYD). “Immaculate” was significantly (p ≤ 0.05) taller with more leaves but thinner girth. Although generally lower in NF/NB, and not different in FYD, the “P.H. Baby” had more flowers (CNB and CNF) in experiment I. Except for no significant difference in FYD and lower NF/NB recorded by all manure rates compared to control in experiment II, plants treated with 5 t/ha PM recorded more flowers (CNB and CNF). Significant first and second order interaction effects (p ≤ 0.05) showed that “Immaculate” had taller height and more leaves but “P.H. Baby” had more CNB and CNF, although both were not different in FYD. In addition, plants supplied with 5 t/ha PM rates were better in plant height, number of leaves, CNB and CNF compared to other manure rates. In conclusion, year two environmental conditions supported better crop growth and yield, “Immaculate” grew better vegetatively but both were not different in floral yield, while the 5 t/ha PM was considered the optimum manure application rate under the rain-fed condition.

Impact of Seasons on Soil Physico-Chemical Properties and Tea Yields Based on Enriched Sheep Manure Used in Kericho, Kenya

Tea (Camellia sinensis (L) O. Kuntze) is a perennial crop grown for beverage consumption. Its production is the leading foreign exchange earner in Kenya contributing about 26% foreign exchange and 4% GDP. Nitrogen (N), Phosphorus (P) and potassium (K) are the recommended nutrients for tea production. However, their continuous use has been reported to have negative effect on soil physico-chemical properties and health. Sheep manure has been recommended in tea production for its soil pH buffering effect and increased tea yields. However, effects of sheep manure enriched with inorganic fertilizer on tea soils and yield have not been conclusively investigated. This study was established at KALRO—Tea Research Institute Kericho in Timbilil estate to determine the impact of seasonal variation on soil pysico-chemical properties and yields on enriched sheep manure used. Randomized complete block design (RCBD) experimental design was adopted with 14 treatments replicated thrice. The treatments were: control with no fertilizer use, NPK at 180 Kgs N/ha/yr, sheep manure only and two enriched sheep manure ratios of 4:1 and 8:1 which translates to a mixture of (4:1) 4 parts of sheep manure and 1 part of D.A.P inorganic fertilizer. Same applied to 8:1 ratio, respectively at rates of 60, 120, 180 and 240 Kgs N/ha once per year. Data were subjected to ANOVA in GenStat statistical package and means separated by Duncan’s multiple range tests at P ≤ 0.05 significance level. Results obtained showed that soil physico-chemical properties and tea yields were influenced significantly (P ≤ 0.05) by treatments applied. Soil available water and organic matter were higher on enriched sheep manure 4:1 at 240 rate used while soil porosity and bulk density were not significantly affected. Total N and P, increased with enriched sheep manure ratio of 4:1 at 240 rate while K+, Ca2+, Mg2+, Mn and pH increased with sole application of sheep manure at rate 180 and enriched sheep manure 8:1 at 180 rate. Tea yields increased with enriched sheep manure 4:1 ratios at the rates of 240. The findings recommend enriched sheep manure 4:1 ratio at 240 rates to be adopted by tea farmers within Kericho region. Further studies involving different geographical locations are proposed.

不同季节云抗10号厌氧加工白茶的品质差异探究

本研究以春、夏、秋三个季节云抗10号一芽二、三叶鲜叶为原料,经过厌氧处理后采用相同工艺加工成白茶,对其进行感官审评、理化成分测定和UHPLC-MS/MS高通量技术检测氨基酸组分含量,以探究三个季节的原料经厌氧处理后制成的白茶品质差异。结果表明,三个季节的白茶品质差异明显,其中春季白茶干茶色泽翠绿,香气浓郁持久且高扬,并且有花蜜香、毫香、药香以及独特工艺香等多种香气类型,滋味浓鲜甜爽,汤色黄亮,叶底软嫩明亮,感官品质最好。春季白茶的氨基酸、可溶性糖、咖啡碱、水浸出物和黄酮类含量最高,夏季白茶的茶多酚含量最高。氨基酸成分中共检测到20种,其中显著性差异氨基酸有18种(P<0.05)。春季白茶γ-氨基丁酸(GABA)含量最高为1.22 mg/g,有8种氨基酸组分在春季白茶中含量最高;有3种在夏季白茶中含量最高;有6种在秋季白茶中含量最高。通过PCA主成分分析以及差异化合物筛选共得到15种区别三个季节白茶的差异化合物。综合感官审评结果、理化成分以及氨基酸组分来看,春季白茶与夏、秋两季白茶有明显差异,且春季白茶整体品质更优。

西藏墨脱县6个茶树品种春夏两季化学品质差异分析

以墨脱种植的6个茶树品种特早213、槠叶齐、中茶302、铁观音、英红九号、凤凰单丛为供试材料,对其春夏两季水浸出物、茶多酚、游离氨基酸、咖啡碱、氨基酸组分、儿茶素组分进行测定与比较分析。结果表明,除夏季茶多酚外,春夏两季各品质成分品种间差异均达到显著水平;酚氨比均值分别为4.60、7.99,夏茶具备较好的绿茶、红茶适制性。6个品种共检测到18种氨基酸组分,含量从高到低依次为鲜味氨类基酸>甜味氨类基酸>苦味氨类基酸>芳香类氨基酸,春季材料鲜味类、甜味类氨基酸显著高于夏季。相关性分析表明,各代谢产物间合成高度相关。主成分分析与正交偏最小二乘判别分析表明,季节比品种对茶叶代谢产物差异影响更大。春夏两季筛选出16种差异代谢产物,包括7种氨基酸组分、8种儿茶素组分及咖啡碱,可作为区别区分春、夏茶的潜在标志。本研究明确了墨脱茶叶生化品质特征,为茶叶加工方向提供了参考依据。

白茶品质成分分析及在化妆品中的作用初探

以6种不同季节、等级的白茶为研究对象,采用水提醇沉法、醇浸提法进行提取,测定并比较生化成分表没食子儿茶素没食子酸酯(epigallocatechin gallate,EGCG)、总多糖、总黄酮、生命元素、氨基酸、维生素的含量,发现夏季的白牡丹多糖、EGCG含量最高,总黄酮、生命元素、维生素含量第二,整体成分含量优势明显,为白茶在化妆品中的充分利用提供数据支持。

基于非靶向代谢组学比较不同采制季节四川白茶滋味物质差异

为探究不同采制季节四川白茶的滋味差异,以不同季节的华蓥山白茶为对象,采用超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法,结合感官评定,对白茶滋味物质进行非靶向代谢组学分析。结果表明,春、夏、秋季的白茶在感官品质上存在明显差异,共筛查出432种非挥发性化合物,经PCA和HCA分析,三组样品表现出明显的分离趋势,春、夏、秋三个季节白茶滋味相关代谢物差异明显。春茶样品中氨基酸及其代谢物含量较高,而夏、秋茶中酚类化合物及有机酸含量较高。采用正交偏最小二乘法结合非参数检验,获得了具有标志性差异的成分156种(VIP>1.0,P<0.05),包括25种有机酸类、21种氨基酸及其衍生物类、4种核苷酸及其衍生物类、79种酚类(包括黄酮醇类和黄酮苷类、儿茶素类、鞣质类)、27种其他类(包含可溶性糖及其代谢产物、维生素、生物碱等)。

基于宏基因组测序揭示不同施肥方式对茶园土壤微生物群落的季节性影响

为揭示不同施肥方式对茶园土壤微生物群落的季节性影响,采用宏基因组测序,比较分析了同一茶园习惯施肥(CF)、微生物有机肥配施控释复合肥(MC),在冬季至夏季3个时间点[11月14日(CF1、MC1)、3月1日(CF2、MC2)、5月15日(CF3、MC3)]的土壤微生物群落组成和结构。结果表明,共获得311211956条高质量测序数据和1763759个Unigenes。主成分和相关性分析表明,MC1和CF1的土壤微生物基因丰度聚为一类,其他独聚一类。不同季节,CF和MC的细菌、古菌、真菌分别占微生物总数的88%~89%、0.8%~2.0%、0.02%~0.10%;古菌数量逐渐增加,真菌数量先增加后降低。CF2、CF3的古菌数量分别高于MC2、MC3,而真菌数量相反;CF2、CF3的细菌、真菌丰度分别显著低于MC2、MC3,古菌丰度相反。MC1、MC2、MC3之间的细菌、古菌、真菌丰度存在显著差异,而CF1与CF3的真菌丰度接近。相较于CF,MC提高了土壤细菌中的变形菌门、放线菌门、芽单胞菌门、绿弯菌门、拟杆菌门、硝化螺旋菌门、装甲菌门相对丰度,降低了酸杆菌门、疣微菌门、浮霉菌门相对丰度;提高了古菌中的奇古菌门相对丰度,降低了广古菌门、泉古菌门、深古菌门相对丰度;提高了真菌中的毛霉门、捕虫霉门、隐真菌门相对丰度,降低了担子菌门相对丰度。总体上,CF和MC优势细菌门、优势古菌门、优势真菌门相对丰度的季节性变化趋势存在一定差异。茶园土壤微生物群落组成和结构呈现一定的季节性、施肥方式性变化规律;微生物有机肥配施控释复合肥可以提高土壤细菌丰度、真菌数量和丰度,降低古菌数量和丰度,改变土壤优势菌群的组成,为充分利用微生物资源、提高茶树养分利用率等提供了理论依据。

赤壁市茶园土壤多环芳烃季节分布的特征分析

土壤是持久性有机污染物多环芳烃(PAHs)的主要归趋之一,城市、农业、工业等土壤中PAHs浓度水平、污染来源及风险评估等研究得到了广泛的关注。采用气相色谱质谱联用法对赤壁市太平口村茶园土壤PAHs的分布、来源及生态风险评价进行了季节差异分析。结果表明:茶园土壤中16种PAHs的总浓度为18.38~154.44 ng·g^(-1),平均值71.33 ng·g^(-1);夏季土壤中PAHs浓度略高于冬季。整体上茶园土壤中PAHs是以5~6环组成为主,但在冬季有25%样点是以2~3环为主。通过源解析发现,赤壁市茶园土壤PAHs主要来自石油燃烧,木材及煤炭燃烧等混合燃烧源。其中冬季土壤PAHs还存在石油输入源。茶园土壤中总有机碳(TOC)与总PAHs存在显著的相关性(r^(2)=0.46,p≤0.05),其中与高环PAHs之间存在显著相关性(r^(2)=0.5,p≤0.01),与低环PAHs不存在相关性(r^(2)=0.13,p≥0.05)。生态风险评价结果表示,尽管赤壁市茶园土壤PAHs整体生态风险相对较低,但也存在一定致癌风险,其中以苯并(b)荧蒽(BbF)、二苯并(a,h)蒽(DahA)和茚并(1,2,3-cd)芘(InP)的毒性当量浓度贡献最大。

茶区配电网适应性规划和节能优化管理

针对茶区用电负荷特性和茶区配电网存在的问题,基于用电可靠性、安全性和经济性,建立茶区配电网适应性规划和节能优化管理机制,采取茶区饱和负荷精准预测、台区低压线路互联、三相不平衡治理、制茶设备改造等措施,解决茶季季节性高峰用电安全隐患、供电能力不足,以及非茶季设备轻载、线损率高等难题,实现茶区高可靠性供电和企业降损增效的目的。

Tea Production Response to Seasonal Rainfall Variability: Evidence from Rwanda

Tea is a very important cash crop in Rwanda, as it provides crucial income and employment for farmers in poor rural areas. From 2017 to 2020, this study was intended to determine the impact of seasonal rainfall on tea output in Rwanda while still considering temperature, plot size (land), and fertiliser for tea plantations in three of Rwanda’s western, southern, and northern provinces, western province with “Gisovu” and “Nyabihu”, southern with “Kitabi”, and northern with “Mulindi” tea company. The study tested the level of statistical significance of all considered variables in different formulation of panel data models to assess individual behaviour of independent variables that would affect tea production. According to this study, a positive change in rainfall of 1 mm will increase tea production by 0.215 percentage points of tons of fresh leaves. Rainfall is a statistically significant variable among all variables with a positive impact on tea output Qitin Rwanda’s Western, Southern, and Northern provinces. Rainfall availability favourably affects tea output and supports our claim. Therefore, there is a need for collaboration efforts towards developing sustainable adaptation and mitigation options against climate change, targeting tea farming and the government to ensure that tea policy reforms are targeted towards raising the competitiveness of Rwandan tea at local and global market.

茶树新品系‘606’乌龙茶在不同季节的品质分析

为探究不同季节对茶树新品系‘606’乌龙茶品质的影响,本研究采用超高效液相色谱-三重四极杆串联质谱(UPLC-QqQ MS)靶向代谢组学、顶空固相微萃取法结合气相色谱-飞行时间质谱联用(HS-SPME-GC-TOFMS)技术及电子鼻技术(Electronic nose)对新品系‘606’乌龙茶的品质成分进行定性定量测定,通过偏最小二乘-判别分析(PLS-DA)获取不同季节茶样组间差异。结果表明,氨基酸总量呈现春季>秋季>夏季,春季鲜味类氨基酸显著高于秋季与夏季(P<0.05),苦味类氨基酸在夏茶中相对含量较春、秋茶高。儿茶素总量呈现秋茶>夏茶>春茶的规律。氨基酸与儿茶素的差异是造成春、夏、秋茶不同风味品质特征的重要原因。3个季节新品系‘606’乌龙茶共鉴定86种主要特征挥发性成分,醇类和碳氢化合物挥发性组分含量较高,酮类物质是春茶的特征挥发性成分,α-法呢烯是夏茶的特征挥发性成分,反式-橙花叔醇、吲哚、己酸叶醇酯是秋茶的特征挥发性成分。通过建立PLS-DA模型可将3个季节的茶样明显区分,鉴定出23种区分不同季节新品系‘606’乌龙茶的差异挥发性化合物。电子鼻传感器S1,S2,S6,S7,S10在不同季节新品系‘606’乌龙茶的区分中起重要作用,含氮化合物与碳氢化合物是区分不同季节茶样的重要物质。

基于HS-SPME-GC-MS和PLS-DA分析不同季节早白尖红茶挥发性风味物质

采集四川省筠连县春、夏、秋三季共15份早白尖红茶样品,采用顶空固相萃取-气相色谱-质谱技术对红茶样品的香气成分进行测定,运用偏最小二乘-判别分析(partial least square-discriminant analysis,PLS-DA)建立不同季节茶叶判别模型,绘制层次聚类的树状热图确定关键香气成分在不同季节样品中的分布规律。结果表明,春季样品醇类(113.05μg/g)和酯类物质(34.92μg/g)含量明显高于夏秋两季样品,而醛类物质(23.85μg/g)明显低于夏秋两季样品,且所建PLS-DA模型可将春和夏秋两季样品明显区分。进一步分析后的分层聚类的树状热图显示,苯乙醛、橙花醇和香叶醇是春季样品区别于其它两季茶样的特征香气化合物,在此基础上可通过芳樟醇、芳樟醇氧化物Ⅰ和Ⅱ对夏、秋两季样品进行进一步区分。该研究为解析不同季节早白尖红茶香气物质提供基础研究数据,也为进一步探究筠连早白尖红茶关键香气形成机制奠定基础。

基于GC-MS法对茶叶蛋中调味包的香气成分测定

茶叶蛋是一种具有特殊风味的鸡蛋,由调味包和茶叶混合加工后制成,深受消费者喜爱。该研究通过SPME-GC-MS法对茉莉花茶茶叶蛋和绿茶茶叶蛋的调味包中香气成分进行分析。研究结果表明,茶叶蛋类制品的调味包中主要包括烃类化合物(31.92%~49.29%)、醛类化合物(7.18%~11.94%)、环苯类化合物(9.03%~10.67%)、萜烯类化合物(0.62%~7.12%)和醇类化合物(0.35%~4.63%);其中,脂肪烃类化合物含量最高,但脂肪烃类化合物没有特殊气味,对茶叶蛋的香气成分没有贡献;酯类、醇类和苯环类化合物的阈值较高,对茶叶蛋的香气成分贡献较小;醛类化合物的香气阈值较低,是茶叶蛋香气成分的主要来源。该研究为提高茶叶蛋的品质奠定了基础。

茶香型火锅底料的配方优化及其挥发性风味成分分析

为了研发一款具有茶香特殊风味的火锅底料新品种,为火锅市场开发提供一条新途径,以茶香型火锅底料的感官评分为评价指标,通过正交试验确定最佳配方;通过水蒸气蒸馏法提取挥发性风味成分,采用气相色谱-质谱联用法定性分析挥发性风味成分的组成。结果表明,通过对花椒、茉莉花茶和药食同源中药材(人参、甘草、枸杞、麦冬须根)添加量3个因素进行分析,得出最佳配方为:制作2000 mL的茶香型火锅底料需花椒11 g、茉莉花茶20 g、中药材20 g(人参∶甘草∶枸杞∶麦冬须根为4∶4∶4∶8)。同时,茶香型火锅底料挥发性风味成分共有65种,其中烃类23种、醇类11种、醛类10种、酯类9种、醚类5种、酚类3种、酮类3种、杂环类1种;占比最高的挥发性风味成分有丁香酚14.20%、肉桂醛10.67%、对丙烯基茴香醚9.76%、4-烯丙基苯甲醚6.31%、芳樟醇6.18%、对甲氧基苯甲醛4.57%、4-萜烯醇3.61%、苄醇3.33%、桉叶油醇3.14%。该研究可为茶香型火锅底料的开发和应用提供一定的理论依据。

贵州2个紫芽茶树品系主要生化成分的季节性变化

【目的】对筛选的贵州望谟八步茶2个紫芽茶树品系主要生化成分进行比较分析,为望谟八步茶种质资源的筛选与茶产品的开发提供参考。【方法】以望谟本地绿芽品系为对照(CK),采用高效液相色谱等方法,对紫芽品系ZY-1和ZY-2一年四季(4个月份)1芽2叶的5个常规成分、10种儿茶素单体和3种生物碱组分进行检测分析。【结果】随季节变更,紫芽茶树品系ZY-1和ZY-21芽2叶的水浸出物含量变化显著,可溶性糖含量均呈先增加、后减少、再增加的变化趋势;游离氨基酸总量均在3月达最高,花青素含量与茶树叶色表型表现一致,顺序依次为ZY-1>ZY-2>CK,且ZY-1、ZY-2和CK的花青素含量为7.26、3.31和2.48 mg/g。ZY-1和ZY-2的生物碱组分和儿茶素单体随季节变化差异显著(P<0.05,下同),其中,茶叶碱含量呈现显著降低的趋势,且均为ZY-1>ZY-2>CK,咖啡碱含量和生物碱总量分别在3和8月积累较多;非酯型儿茶素EC和EGC含量在10月较高,酯型儿茶素GCG、EGCG和EGCG3"Me含量在5和8月较高,非酯型儿茶素和酯型儿茶素含量规律大致为ZY-2>ZY-1;从儿茶素指数上看,ZY-1和ZY-2的持嫩性均较好。【结论】茶树叶色紫化程度不同的茶叶品系,其在不同季节主要生化成分含量存在差异,紫芽茶树品系更适制绿茶和功能型高花青素茶产品。

不同季节信阳毛尖茶主要生化成分及其矿质元素差异性分析

目的基于不同季节信阳毛尖茶的生化成分和矿质元素,探究多元统计分析方法对不同季节信阳毛尖茶的有效区分。方法采用高效液相色谱法等化学方法对64种信阳毛尖茶主要生化成分及其矿质元素进行检测分析,结合正交矫正偏最小二乘法判别分析获取不同季节茶样的组间差异。结果研究结果表明游离氨基酸、黄酮类物质、水溶性碳水化合物、非酯型儿茶素、表儿茶素(epicatechin,EC)、表没食子儿茶素(epigallocatechin,EGC)、没食子酸(gallic acid,GA)及矿质元素均存在季节性显著差异。判别分析可将信阳毛尖春茶和夏秋茶明显区分,并鉴定出黄酮类物质、游离氨基酸、GA、儿茶素(catechin,C)、EC、EGC、Mg和Zn 8种判别不同季节信阳毛尖茶的重要差异化合物。热图分析结果进一步证实,茶多酚、游离氨基酸、C、表儿茶素没食子酸酯(epicatechin gallate,ECG)和GA等物质主要在春茶中积累,黄酮类物质、EGC、表没食子儿茶素没食子酸酯(epigallocatechin gallate,EGCG)、Mg、Fe、Zn和Se等物质主要在夏秋茶上积累。结论本研究鉴别了不同季节信阳毛尖茶的特征性差异化合物,为信阳毛尖茶的季节识别提供理论基础。

不同栽培方式对黄金茶土壤环境及幼苗生长的影响

为了明确黄金茶采用覆膜与起垄栽培的技术效果,在湘西州的高温干旱季节,以黄金茶1号为试材,研究了不同栽培方式对黄金茶土壤环境及幼苗生长的影响。结果表明:覆膜起垄(FQ)和覆膜不起垄(FB)0~10和10~20 cm的土壤温度始终高于不覆膜起垄(BQ)和不覆膜不起垄(BB),以FQ的温度最高;FQ和FB处理0~10cm土壤湿度大于BQ和BB处理,且FQ处理10~20 cm土壤湿度在整个试验期间始终大于其他处理;FQ处理的土壤含水量显著高于其他处理;FQ处理的茶苗成活率最高,其次是BQ处理,成活率分别为85.0%和31.7%;茶苗的侧根数以FQ最多,单株重以FQ最重。因此,覆膜起垄栽培有利于茶苗生长,可以达到提高茶树幼苗抗旱性的效果。

不同季节翠玉品种3大茶类生化成分及抗氧化活性研究

对不同季节(春、夏、秋)翠玉品种3大茶类(绿茶、乌龙茶和红茶)的生化成分含量及抗氧化能力进行分析研究。结果表明:不同季节翠玉绿茶中,夏茶的抗氧化能力最强,其茶多酚、儿茶素总量较春茶低,但酯型儿茶素的含量为最高;不同季节翠玉乌龙茶中,夏茶的抗氧化能力最强,其茶多酚、儿茶素和酯型儿茶素的含量均为最高,其茶多糖的含量也较绿茶和红茶夏茶高;不同季节翠玉红茶的抗氧化能力差异不大。从不同茶类来看,翠玉品种的茶叶的抗氧化能力表现为绿茶>乌龙茶>红茶。

金萱品种夏暑茶类的生化成分分析及其抗氧化活性研究

本文对金萱品种不同茶类的夏茶与春茶、秋茶的生化成分含量及抗氧化能力进行了分析研究。结果表明:不同季节金萱绿茶中,夏茶的抗氧化能力最强,其茶多酚、儿茶素和酯型儿茶素的含量也最高;不同季节金萱乌龙茶中,夏茶的抗氧化能力最强,与金萱绿茶春茶的抗氧化能力相当,仅次于抗氧化能力最强的金萱绿茶夏茶,其茶多酚、儿茶素和酯型儿茶素的含量较低,茶多糖的含量则明显高于春茶和秋茶;不同季节金萱红茶的抗氧化能力差异不大。从不同茶类来看,金萱品种的茶叶的抗氧化能力表现为绿茶>乌龙茶>红茶。