CSI E-Chronicle - August 2018
The e-Chronicle is a monthly publication from Chromatographic Specialties Inc. It showcases new products, suppliers, literature and news from across the chromatography industry.
- New Supplier
- LGC - Reference Standards
- New Products
- AccuStandard - T.K. Exempted Cannabinoid Standards
- Featured Product
- Restek – High Quality MS Replacement Parts
- New Literature
- Hichrom – HPLC Column Catalogue
- CSI - 2018 Cost Savings Brochure
- Technical Tip
- Calibration Curve Tech Tip
- Application Note
- LCTech - Determination of Pesticides in Fruits and Vegetables Automated with FREESTYLE QuEChERS and LC-MS/MS
LGC - Reference Standards
NEW PRODUCTS
AccuStandard - T.K. Exempted Cannabinoid Standards
Exempted as Test Kits (T.K.) by Health Canada for the use of a controlled substance for scientific purposes- Main cannabinoids available:
- THC-8 and THC-9
- Cannabichromene (CBC)
- Cannabidiol (CBD)
- Cannabidiolic acid (CBDA)
- Cannabinol (CBN)
- Cannabigerol (CBG)
- THCA-A
- Tetrahydrocannabivarin (THCV)
- Made under ISO 9001, ISO 17025 and Guide 34 accreditation
Click here to order or request a quote.
FEATURED PRODUCTS
Restek – High Quality MS Replacement Parts
Outfit your Agilent MSDs with Restek chromatography supplies including high-temp EI filaments; fittings, connectors, nuts & transfer lines; ETP electron multipliers; pump oil & cleaning powders; and more.
Click here for more information.
Click here to order or request a quote.
NEW LITERATURE
Hichrom – HPLC Column Catalogue
Hichom Limited has acquired the worldwide exclusive rights to manufacture Vydac®, Alltima®, Alltima® HP, Apex™, Apollo™, Allsep®, Genesis™, and Prevail™ analytical HPLC column ranges from Grace. These columns are manufactured to the same exacting manufacturing protocols and to identical specifications previously used by Grace / Alltech.
Click here for the PDF.
Contact us to request a printed copy.
CSI - 2018 Cost Savings Brochure
Have you received our 2018 Cost Savings Brochure? It features a wide range of chromatography products, instruments, services and tips to help you and your lab save time, money, and effort.
Click here for the PDF.
Contact us to request a printed copy.
Technical Tip
Calibration Curve Tech Tip
It’s very common to space calibration standards very closely in the lower portion of a calibration curve and use more widely spaced points in the high concentration portion of the curve. The goal is to better define the critical low concentration range while keeping the total number of standards to a minimum.
However, the mathematics of Linear Least Squares regression causes this extremely logical trick to backfire. The LLS algorithm in effect places the fulcrum of a teeter-totter at the median x-value (standard concentration) of the calibration curve. This gives the outlying x-values an undue influence on the regression. Statisticians analysing data where the x-values are measured rather than set run into this problem frequently and watch for such “influential points”.
Application Note
LCTech - Determination of Pesticides in Fruits and Vegetables Automated with FREESTYLE QuEChERS and LC-MS/MS
QuEChERS has become the most important analytical method in routine pesticide labs for food and feed samples. The original QuEChERS set-up in brief consists of two main steps, the extraction and the clean-up step. Both of them are typically manually performed and use a dispersive approach, where two different buffer/salt and clean-up mixes are added to matrix solutions, respectively, with subsequent vortexing and centrifugation steps.
The aim of this application note is to show an automated approach for the second, the clean-up step in a non-dispersive way. Automation itself is a warrantor for highly precise processing with reduced deviation of analytical results even in sequences with a high sample number. Furthermore, using a non-dispersive approach, chromatography in general is better and unwanted matrix compounds or particles are retained on the top of the cartridge, thus leading to cleaner extracts with reduced matrix suppression in the LC-MS/MS measurement.
Click here to read more.