顶空气相色谱分析啤酒中有机挥发物异丙醇

文献名： Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者： Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要：In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词：Bismuth; Nanoparticles; Laser ablation; Cysteine

市面上有众多的新冠病毒qPCR检测试剂盒，本应用方案采用韩国Seegene公司的AllplexTM 2019-nCoV检测试剂盒在耶拿荧光定量PCR仪 qTOWER³G上进行样品检测，获得符合预期的结果。

金属检测技术的局限性之一是对于像电线和大头针这样相对比较小的、长条形金属异物就很难检测出来。这些类型的污染物通常表现出“方向效应”，即金属探测器所检测到的信号很大程度上取决于污染物与探测孔的方向关系。方向效应给金属检测系统带来了挑战——这一挑战乍一看并不是那么严重，但事实上它可能会给消费者的安全以及品牌声誉带来严重的影响和危害。

二氧化硅是用于检测、控制和尽量减少涡轮机、换热器和锅炉结垢的一种关键度量。在线实时测量活性二氧化硅可尽量降低因结垢而产生的维修/更换成本，实现安全高效的长期运行，这款在线二氧化硅分析仪可用于对二氧化硅超标的生产用水的去除或回收进行即时或自动的决策。连续实时二氧化硅监测可快速通知离子交换树脂的RO穿透或饱和情况，从而使系统效率最大化，尽量减少维修停机时间。Orion 8030cX 在线二氧化硅分析仪可配置为在二氧化硅峰值出现时发送警告/警报或测量数据来警告用户，触发纠正措施，防止下游出现问题。