Modified carbon paste screen printed electrodes forrapid fingerprinting of white wine oxidizable fra

来源 :第九届国际葡萄与葡萄酒学术研讨会 | 被引量 : 0次 | 上传用户:gogouu
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  Oxidative reactions occurring upon accidental or deliberate exposure of wine to oxygen are common during wine production and storage, resulting in either beneficial or detrimental effects mainly depending on oxygen quantities and wine type.Wine typically contains a complex pool of oxidizable compounds, including phenolics, ascorbic acid, SO2, different thiols and so on.Initial reaction with oxygen involves oxidation of ortho-diphenols to form quinones, which can in turn react with the other oxidizable compounds.Types and extents of these reactions occurring may depend on some individual species and/or their relative proportions, such as the presence of catalysts, pH, temperature, and probably other hitherto unidentified factors.Voltammetric techniques have been successfully applied to the analysis of different oxidizable compounds, including phenolics which are the primary target of wine oxidation.Recent progresses in this field have led to the development of disposable electrodes, allowing to bypassing the tedious electrode cleaning procedures associated with voltammetric analyses of phenol-rich matrices.Applications of such electrodes for white wine analysis have been reported but still remained limited so far.In this study, the electrochemical response of modified carbon paste disposable electrodes towards major white wine oxidizable compounds (catechin, caffeic, gallic, coutaric, ferulic and ascorbic acids, quercetin, SO2 and glutathione), either alone or in mixtures, were studied.Voltammograms were acquired in the 0-1200 mV region, allowing to defining the characteristic voltammetric features of the different compounds, alone or in binary mixtures.A set of 15 commercial French wines, consisting of Muscadet (6), Chardonnay (3), Riesling (4) and Viognier (2), were then analyzed under the same conditions to obtain voltammetric fingerprints of the oxidizable compound pool of each wine.Major differences in the voltammetric profiles obtained were observed, in particular in the region around 500 mV, corresponding to ortho-diphenols and other easily oxidizable compounds.The ability of the electrodes to discriminate the different wines was evaluated by a chemometric approach involving different pre-treatment strategies in conjunction with PCA and PLS-DA multivariate methods.Discrimination of the four wine types could be obtained, indicating that this analytical approach can provide a useful tool in the characterization of the oxidizable substrate pool of different white wines.
其他文献
从疫病风险因素识别、风险评估模型构建以及风险评估系统开发等方面,阐述了基于Web的规模猪场疫病风险评估技术应用模式.被评估猪场通过在线回答评估问卷上传疫病风险数据信息获得即时评估报告.该技术模式可以增进猪场兽医、管理者与兽医专家之间的风险交流,帮助猪场系统认识和查找疫病风险因素,评估和报告猪场在工程防疫、生物安全、免疫监测三大体系中潜在高风险项,促进疫病防控措施改进和完善.随着被评估猪场和数据样本
信息化越来越多地走入生活,在中国畜牧兽医业发展中也越来越多地被应用.将信息化与分子生物学技术、大数据技术等结合起来.利用信息化技术,可以从网上得到世界各地的全基因组序列,结合现代分子生物学技术、信息学分析技术、分子钟技术,可以更为精确的了解病毒从起源到进化,以及更为精确的了解病毒在世界流行和变异情况,以及基因变异在病毒跨宿主传播中的意义.另外,随着信息化大数据时代的到来,利用信息技术的知识图谱的可
为满足动物卫生风险评估预警管理系统开发与应用需求,对动物卫生风险评估预警进行了分析,本系统将管理模块划分为预警标准管理模块、可追溯系统管理模块、疫病监控管理模块、风险评估管理模块、GIS预警展示模块、风险评估经济评价模块和系统管理模块7个部分,建立了动物卫生风险评估预警管理系统.该系统在Visual studi0 2010开发平台下,基于Web的5层软件体系结构,采用B/S模式,在.NET编程环境
为了解小反刍兽疫病毒H蛋白与其SLAM受体相互作用的机制,进一步促进PPRV在感染、传播和致病机制的研究工作,本研究通过生物信息学技术对不同PPRV H蛋白和SLAM受体蛋白的胞外区、信号肽进行了预测.为进一步揭示PPRV H蛋白与病毒致病性的关系,对PPRV Nigeria 75/1疫苗株、PPRV Nigeria 75/1克隆株、Tibet 07株H蛋白与人、犬、绵羊的SLAM受体的单个蛋白及
为了更好地使光照因素作用于鸡的生长发育,增加养殖场蛋产量,提出了两种用于鸡舍的补光系统的设计方案.在介绍两种方案的工作原理和工作流程的基础上,比较它们的实现方法,从光色决策、驱动、匀光效果等方面详细分析了各自的优缺点,为鸡舍的光色调控寻得了最佳的设计方案.通过比较两方案,可知:在匀光效果方面,乙方案在光照均匀度方面由于每个灯珠上都集成了三色发光器,灯珠在发光时在其内部已经有了一个很好的混色效果,出
研制的环控系统广泛应用于各大畜禽养殖场环境控制.实现了环境监测与控制一体,同时可以与手机、电脑等PC设备连接随时查看猪舍情况并即时控制风机、水帘、测风窗等外部设备,真正实现了物联网在环境控制领域的应用.环控系统主要有以下几个系列:温控系统、冷暖值班员、物联网环境控制等.温控系统:通过温度传感器采集温度发往温控模块,温度模块根据人为设置参数来自动开启和关闭风机、水帘、小窗等外部设备.优点:拥有可视化
酚类物质不仅影响葡萄酒的感官质量(颜色、香气和口感),而且影响葡萄酒的生理活性功能.通过对太谷地区赤霞珠、蛇龙珠、美乐、神索葡萄酚类物质的含量、种类,及其果实不同部位的分布差异进行分析,为葡萄酒的酿造提供参考和指导.分析结果表明,葡萄果实不同部位的酚类物质差异十分显著.葡萄皮中总酚(TPC)含量为47~125mg/100g(FW,鲜重),黄烷醇(TFA)含量为4.8~15mg/100g(FW);葡
近年来,大量葡萄品种气候区划的研究表明,渭北旱塬东部地区的合阳是酿酒葡萄潜在的优良适栽区,但至今有关该地区酿酒葡萄糖累积等成熟特性的研究鲜有报道.本试验系统研究了赤霞珠、品丽珠、梅尔诺、黑比诺和马瑟兰五个红色酿酒葡萄品种在该地区的糖分累积特性.结果表明:成熟葡萄浆果糖分含量在194~240g/L,其中品丽珠最高,梅尔诺最低,且品种间差异显著;在8月7日到9月27日阶段,糖累积量在43~117g/L
为明确臭氧水溶液在葡萄霜霉病防治中的应用效果,分别在实验室和田间进行了臭氧水溶液处理感病葡萄叶片的试验.试验结果表明,喷施臭氧水溶液对葡萄霜霉病具有很好的防治效果,其效果优于甲霜锰锌,而与烯酰吗啉等同;在浓度较高的情况下,温度变化对臭氧水溶液的病害防治效果没有明显的影响.
本研究旨在揭示葡萄成熟过程中果实中的β-葡萄糖苷酶活性和果实成熟度的关系.实验以采自宁夏贺兰山东麓青铜峡御马葡萄园的不同成熟度的梅鹿辄、黑比诺、赤霞珠葡萄浆果为试验材料,用常规化学方法对含糖量和总酸进行了测定,并计算成熟系数.采用以对-硝基苯酚β-D-葡萄糖苷为底物的比色法,对葡萄果实的β-葡萄糖苷酶的活性进行了分析.结果表明,梅鹿辄、黑比诺、赤霞珠三个葡萄品种的浆果,其果实中的β-葡萄糖苷酶活性