Welch Materials attended ASIA PHARMA EXPO 2020 in Bangladesh at 28th Feb–1st Mar. As Bangladesh’s largest exhibition in the aspect of pharmaceutical machinery and technology, ASIA PHARMA EXPO 2020 attracted more than 670 exhibiting companies from 32 different countries and 12,800 attendees to come. It included pharmaceutical processing machinery, packaging machinery, laboratory equipment and related services. In this exhibition, Welch has displayed our star products: HPLC columns, Ghost-Buster columns, SPE columns, QuEChERS, Flash columns, Protein Read more…

We are proud to announce that our US subsidiary has moved to a new location in West Haven, CT.  We spent the previous few years in finding an appropriate place for the head office in US, and finally we find this great place. The new office is actual a storefront in downtown West Haven, putting us right on the street and looking out onto downtown’s main intersection.  Across the street is the City Hall, which Read more…

Welch Materials attended Analytica Latin America 2019 in Sao Paulo at 24-26th Sep. Analytica is one of the main global gathering places for the chemical and analytical industry. Suppliers, distributors and manufacturers of sectors, such as laboratory technology, biotechnology and quality control exhibit the latest news and trends of the sector during this biennial event. In this exhibition, Welch has displayed HPLC columns, Ghost-Buster columns, SPE columns, QuEChERS, Flash columns, Protein Purification products, etc, which have received Read more…

◆ ◆ ◆ ◆ Why to separate polycyclic aromatic hydrocarbons? Polycyclic aromatic hydrocarbons are volatile hydrocarbons produced when coal, petroleum, wood, tobacco, organic polymer compounds and other organic substances are not completely burned. They are environmental and food contaminants, which are widely found in the atmosphere, water and soil. And more than 200 polycyclic aromatic hydrocarbons that have been discovered are carcinogenic, so we need to detect polycyclic aromatic hydrocarbons in the environment and food. ◆ Read more…

Guard column and Pre-column inline filter are commonly used in LC experiments. But a lot of users are confused about the two products as they look similar. How to distinguish? What’s the difference? Follow us and you will get answers.  The difference between Guard column and Pre-column Inline Filter Both are connected in front of the column and can prevent solid particles from blocking the frit of the column. However, there is a difference between Read more…

What’s Ghost Peaks? In the chromatographic separation, there are some peaks which appears erratically like ghosts during gradient elution or long-period operation, we call them Ghost Peaks. The harm of ghost peaks Ghost Peak is not scary, but he is annoying! Ghost Peak brings the following major hazards: 1. Misjudge the composition of the sample; 2. Overlap with the target peak, affecting the resolution; 3, Do more verification work to determine whether the substance is the target; 4. Pollute Read more…

Introduction In 1975, Porath et al. proposed a new purification method – immobilized metal chelate chromatography. This method uses coordination-chelation interaction of metal ions (Ni2+, Cu2+, etc.) with residues on the surface of amino acids (such as the imidazolyl group of histidine) to purify proteins that have an affinity for metal ions. The histidine tag is widely used because it has a small molecular weight and hardly interferes with the function, activity and structure of Read more…

Common problems occurred in the use of HPLC columns HPLC column is the “HEART” of the chromatographic system. Due to the wide variety of samples and the complex matrix of the sample, HPLC column is easily contaminated by strong retained substances. These strongly retained substances are usually difficult to elute. After multiple sample loadings, they accumulate at the end of the column, block the frit, and may even interact with the packing materials to cause Read more…

Dear Customers, Please be informed that recently some of our customers may have received mails from info@welchmat.com requesting payment related details(as shown below), which is confirmed to be a Fake mail address! The REAL info@welchmat.com address is working normally and we definitely do not send any mails or requests to customer by this info address. If you got any questions about this, please contact directly with our sales for confirmation. And in case of any personal information leakage Read more…

C18 is retentive to non-polar compounds as the non-polarity of C18 group, but for polar compounds, sometimes the mobile phase with high water ratio should be used to make the analyte retained on the column. However, under this condition for a long time, phase collapse will occur on conventional C18, which will gradually weaken the force between the stationary phase and the mobile phase and shorten the retention time of compounds. To solve this problem, Read more…