综合二维气相色谱

Study of volatile profile in cocoa nibs, cocoa liquor and chocolate on production process using GC × GC-QMS

ty10086 提交于 周四, 08/26/2021 - 13:16
Abstract(#br)Chocolate quality depends on the type of cocoa and how its manufacture was conducted. In this work, the analysis of the volatile fraction of the principal steps - from cocoa to chocolate - was performed. For this purpose, unroasted nibs, liquor and chocolate samples from five different places were used, and the isolation was conducted by HS-SPME (headspace solid phase microextraction) using a DVB/CAR/PDMS (divinylbenzene/carboxen/polydimethylsiloxane) fiber, lately desorbed in a homemade GC × GC chromatograph and detected by mass spectrometry.

低成本、开源的化工分离策略

ty10086 提交于 周三, 08/25/2021 - 16:28
近年来,一种利用开放存取资源进行实验室研究的趋势已经开始。科学硬件的开源设计策略依赖于使用广泛可用的部件,特别是那些可以直接打印的部件,使用可与低成本微控制器连接的可加性制造技术和电子元件。开源软件消除了昂贵商业许可证的需要,提供了针对特定需求设计程序的机会。本综述对化学分离领域内的“开源运动”的影响进行了描述,主要是通过对近5年来该领域的研究进行全面的考察。涵盖的主题包括一般实验室设备、样品制备技术、基于分离的分析、检测策略、电子系统控制和数据处理软件。还讨论了在这些与分离有关的专题中继续存在的障碍和进一步采用开源办法的可能机会。