茶叶检测

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安捷伦科技(中国)有限公司 安捷伦
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龙井茶中感官品质检测方案

Sensory evaluation can provide integrated, direct measurements of the perceived quality of food products. However, a sensory panel is subjective and suffers from inconsistency and inaccuracy. In this paper, we propose a sensory evaluation simulation model for Longjing tea (a Chinese brand of green tea). The physiochemical quality indicators of Longjing tea were determined by instrumental analysis, including color, aroma, and taste. Meanwhile, the sensory quality of the tea was evaluated by an expert sensory panel. An artificial neural network was conducted to approximately predict sensory evaluation scores on the basis of physiochemical data. The results showed that physiochemical factors, including hue, fluorescence peak 5, hue chromascale, b, L, 3-(methylthio) propionaldehyde, α-terpineol, linalool, dimethyl sulfide, total aroma value, caffeine, quinic acid, theanin, gallic acid and total catechins were best correlated with sensory evaluation scores. Furthermore, physiochemical features that were chosen according to important factor weights were used to classify Longjing tea into two grades. Experimental results demonstrated that instrumental analysis could be complementarily used in the evaluation and control of sensory quality by establishing a reasonable sensory-instrument correlation and human-simulated predictive model.
检测样品: 茶叶
检测项: 营养成分

北京盈盛恒泰科技有限责任公司

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绿茶中氨基酸检测方案

The Biochrom 30 Amino Acid Analyser is a well established analytical instrument for clinical diagnosis as its IVD approval allows the diagnosis of inborn errors of metabolism such as Phenylketonuria. This robust and reliable instrument is also capable of other types of applications far from the clinical market e.g. its usage in the food industry allows routine analysis of amino acid content in food and feedstuff in quality control laboratories. The Biochrom 30 can also be used for analysing rare, unusual amino acids or derived molecules for research purposes. In order to develop new methods for analysing molecules of interest in the scientific market, a new application has been developed to analyse the theanine content in green tea leaves. Theanine is a molecule derived from the amino acid glutamine and is usually found in tea (infusions of Camellia sinensis), and also in the basidiomycete mushroom Boletus badius. Because it can enter the brain, theanine has psychoactive properties. Theanine has been shown to reduce mental and physical stress, may produce feelings of relaxation, and improves cognition and mood when taken in combination with caffeine. These effects are believed to be caused by the ability of theanine to increase GABA production in the brain. The chemical structure of theanine allows it to be separated and detected in green tea samples using a Biochrom 30 Amino Acid Analyser.
检测样品: 茶叶
检测项: 营养成分

大昌华嘉科学仪器

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使用茶多酚检测仪检测红茶中茶多酚含量的实验操作步骤

检测红茶中茶多酚含量通常使用分光光度计或高效液相色谱仪(HPLC)等仪器。以下是使用分光光度计检测茶多酚含量的一般实验操作步骤。请注意,具体操作步骤可能会因仪器型号和厂商而有所不同。 实验所需材料和设备: 红茶样本 乙酸乙酯或乙醇等用于提取茶多酚的有机溶剂 分光光度计 紫外-可见光谱分析仪或比色皿 深色玻璃瓶 分析天平 玻璃瓶或瓶塞 热水浴或加热板 安全手套、护目镜、实验室外套等个人防护装备 基本的实验室设备和耗材,如试管、移液器、架子、试管架等 实验步骤: 准备样本: 将红茶样本研磨成细粉末,以确保茶多酚可以充分提取。你可以使用研钵和研钉完成这一步骤。 茶多酚提取: 将一定量的红茶粉末称量并置于深色玻璃瓶中。然后,添加足够的乙酸乙酯或乙醇等有机溶剂,使样本完全浸没。用瓶塞密封瓶口。 超声波提取(可选): 如果需要更彻底的提取,可以将瓶子置于超声波浴中,用超声波波动加速茶多酚的溶解。注意安全操作,确保仪器和样品不受损害。 加热提取: 将样品置于热水浴或加热板上,加热一段时间,通常在60-70°C下,以促使茶多酚的充分溶解。定期摇动样品瓶以加强提取。 冷却和离心: 将样品冷却至室温,然后使用离心机离心,分离出有机相和水相。
检测样品: 茶叶
检测项: 营养成分

山东三体仪器有限公司

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仪器信息网行业应用栏目为您提供1055篇茶叶检测方案,可分别用于营养成分检测、食品添加剂检测、理化分析检测、农药残留检测、真菌毒素检测、重金属检测、环境污染物检测、其他检测、非法添加检测,参考标准主要有《GB/T 23205 茶叶中448种农药及相关化学品残留量的测定 液相色谱-串联质谱法》等