Solid phase extraction (SPE): also known as liquid-solid extraction. It refers to the process in which the analyte in the liquid sample is retained on the adsorbent by adsorption and then eluted by a certain solvent. SPE method is a separation technology which combines selectively retention and selectively elution, mainly used Read more…
Overview SEC (Size Exclusion Chromatography) is a technique that separates molecules of interest by their molecular size. There are 2 types of SEC separation known as Gel Filtration Chromatography (uses aqueous solvents) and Gel Permeation Chromatography (uses organic solvents). Both types of SEC use a variety of different types of Read more…
Flash Column For organic synthesis and pharmaceutical chemistry, a largr amount of compounds should be sifted in the early stage. Once the related active compounds are found, it is necessary to purify this high added value compound. Using Flash column to purify is a common method during this procedure. There Read more…
LC Column Flush and store the column according to the instructions. It is recommended to detach the column for storage during holidays. ✦ Reversed-phase column For C18, C8, F-C8, C30, C4 and C3, C18, phenyl, phenyl-hexyl, phenyl-Ether, PFP, PAH, CN bonded phase columns, use mobile phase to flush out all sample components according to the Read more…
In the end of 2020, the 20th CPhI China 2020 rounded off. As one of the exhibitors, we’d like to review the highlight of Welch in this exhibition with you. In spite of the freezing cold in Pudong, Shanghai, the attendees’ enthusiasm poured our booth. During these three days, many people were attracted by our products and Read more…
Event Overview In order to support and contact our customers worldwide, Welch decided to participate in 2020 virtual EAS-Eastern Analytical Symposium which starts this Monday, November 16th. If you cannot go to the trade fair to contact Welch, Welch can come to you. 2020 EAS virtual platform will allow attendees Read more…
About Webinar Last friday, Webinar about HPLC method development and validation was held online. Webinar Content a. Tradition strategy for HPLC method development and a survey of automated tools and software b. 3-pronged template approach for rapid method development c. Use of a universal generic gradient method for the assay of Read more…
Welch’s Winter Sale is on from 11th November to 25th December. Contact Welch ( info@welchmat.com) and local distributer to get more details.
Many analysts will adjust the peak shape and retention time by changing pH during the method development. Because the change of pH will exert various influences on chromatographic behavior of different structures of compounds. For example, the retention of neutral compounds in reversed-phase chromatographic systems has nothing to do with Read more…
You are invited to join our 2.5-hour Free webinar on HPLC method development and validation focusing on the stability-indicating methods in the pharmaceutical analysis of small molecule drugs,” on November 6, 2020, 1:30 – 4 pm ET. Please register by using the link below. Speaker: Dr. Michael Dong, MWD Consulting, Norwalk CT, USA, Read more…