単環芳香族炭化水素にはどのような不純物が隠れていますか？
年末が近づいてくると、ノスタルジックな気分に少しなり、多くの専門家が過去を回顧することを良しとします1。そして私たちはちょっと楽観的で寛大にもなります。研究者たちはまた、寒い部屋の方が暖かな場所にいるよりも懐かしさが増すことに気づきました…
Determining Optimal LC-MS/MS MRMs: Sensitivity is NOT Everything!
LC-MS/MS using electrospray ionization (ESI) is a widely used platform for routine target analysis and quantitation. However, one big challenge faced through the use of ESI is the presence of matrix effects. So, what are matrix effects and why are…
My fitting nut has broken off in the end of my LC column. What to do?
If excessive force is applied at an angle to a fitting or column connector, the ferrule could become stuck in the column end fitting. Likewise, a PEEK connector, column nut or plug can also break and leave part of it…
Pesticides are like Siblings – some get along well and some don’t – No. . .Really?
My colleague, Joe Konschnik and I have been asked by many food chemists out there about how much they can trust their pesticides mixes after they combine them into one single larger mixture for calibrating their instrument, or monitoring the…
PFAS分析最前線：注目される代替PFAS GenXとPFBS
PFASの最新分析動向とRestek Raptor C18カラムを用いた高速・高精度分析を解説。GenXやPFBSなどの代替フッ素化合物の測定に対応し、多様な成分分析や良好な分離を求める環境ラボに最適なカラムソリューションを提案します。
PFAS分析に必須のディレイカラムの重要性と効果
Sometimes I hear this from customers: I don’t need a delay column. I haven’t had any trouble without it so far.” It might be true. You may not have any issues without the delay column, especially when your samples are,…
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GC compounds – poor peak shapes and missing peaks
One of the most common questions I am asked by customers is “Why is my peak shape so poor?” Another is “I do not see a peak for my compound, what should I do?” Sometimes they are developing a new…
Simple Analysis of Bile Acids by GC-MS
Bile acids are a group of steroidal acids with carboxyl and hydroxyl groups on the side. They are the major metabolic products of cholesterol. Bile acids play important roles as biomarkers for early diagnosis and therapeutic monitoring of many diseases,…
High Source Temperatures and Meeting EPA Tuning Criteria
My first blog here at Restek was a demonstration of how increasing the source temperature could improve the raw response of 2,4-dinitrophenol while maintaining the relative response. Four years later I’m here with the promised follow-up on the elevated source…
Several things you may not know about our Super-Clean Gas Filters
Recently one of the designers of the Super-Clean Gas Filters spent some time with technical service and we were able to ask him a few common questions we get asked by customers. I thought I would share this information with…
