41 Reagents, Reference Materials & Laboratory Chemicals
Potassium Dichromate Solutions
0.0000 0.5000 1.0000 1.5000 2.0000 2.5000 3.0000 3.5000 4.0000
220.0 240.0 260.0 280.0 300.0 320.0 340.0 Wavelengths (nm)
UV spectra of potassium dichromate solutions Selecting a reference material supplier
The choice of CRM supplier is as important as the choice of CRM. A fi lter with a calibration certifi cate is not necessarily a CRM! According to ISO, the International Standards Organisation, a CRM supplier should be accredited to ISO 17034:2016: General requirements for the competence of reference material producers. Another frequently cited standard is ISO/IEC 17025:2017: General requirements for the competence of testing and calibration laboratories. A fully accredited CRM supplier should be accredited to both and
240 mg/l 220 mg/l 200 mg/l 180 mg/l 160 mg/l 140mg/l 120 mg/l 100 mg/l 80 mg/l 60 mg/l 40 mg/l 20 mg/l
5 4 3 2 1 0
Blank 25 50 75
100 150 200 250 300 400 500
Starna Green
200 250 300 350 400 450 500 550 600 650 700 Wavelength (nm)
UV and visible spectra of Starna Green solutions
in any case, a proposed supplier’s Schedule of Accreditation should be checked to confi rm that it includes the reference material to be purchased – it may not!
Conclusions
Pharmacopoeia compliance in UV-Visible spectrophotometry can be readily achieved by following a few basic steps and selecting reference materials from a properly accredited supplier.
New Cannabidivarinic Acid Standard Advances Cannabis Analysis
Cannabidivarinic Acid (CBDVA) is a non-psychoactive cannabinoid reported to have anti-inflammatory properties. While its medicinal benefits are still being researched, quantifying this compound in cannabis samples is crucial for obtaining a true measurement of potency and chemovar identification. Restek now offers a new CBDVA certified reference material (CRM) to help labs advance their analysis of cannabis.
Restek’s new CBDVA standard is ideal for creating multipoint (5-point minimum suggested) calibration curves for LC analysis. With verified composition and stability, this prepared stock product eliminates the need for in-house standards preparation for greater convenience and lower labour requirements. As it’s excluded from US DEA Controlled Substances Act (CSA) regulatory controls, no customer permits or licensing required to purchase within the US and because it’s manufactured and QC tested in Restek’s ISO-accredited labs, this new CBDVA standard qualifies as a certified reference material (CRM) that satisfies your ISO requirements.
More information online:
ilmt.co/PL/KorG 52541pr@reply-direct.com
SARS-CoV-2 Reference Materials Now Includes Serology Quality Solutions
LGC’s SeraCare has released ACCURUN® Anti- SARS-CoV-2 Reference Materials to address the critical need for clinical laboratories to be able to report antibody testing results with confidence, in response to the ongoing COVID-19 pandemic. The ACCURUN kit is designed to support assay installation as well as to monitor day-to- day assay performance, as required by CLIA, CAP, ISO-15189 and many other regulatory or accrediting bodies, providing a complete quality solution for SARS-CoV-2 antibody testing.
To support the multiple SARS-CoV-2 serology assay formats available, the product is currently offered in two configurations, one designed for IgG-specific assays and the other for total antibody tests. Both versions include positive materials for antibodies against the SARS-CoV-2 virus as well as complementary negative materials. ACCURUN reference materials are specifically formulated to exhibit low-positive reactivity in true patient-like matrices, to test assay performance near critical signal cutoff boundaries.
More information online:
ilmt.co/PL/JEdP 52354pr@reply-direct.com
Starna Scientific The Spectroscopy Specialists Certified Reference Materials
Quality Cells for Quality Results
Deep UV to Infra-red Fluorescence Microvolume & microplate
Reference Material Producer - ISO 17034 Calibration Laboratory - ISO/IEC 17025 Lifetime Guarantee Fast re-calibration service Custom & OEM
Specialist Optics Toroid, Plano & Spherical Mirrors Mirrors Certified for reflectivity Deep UV coatings
Aluminium, Gold & Multi-layer coatings 0659
Starna Scientific Ltd
www.starna.com +44 (0) 20 8501 5550
sales@starna.com
Fully fused Spectrophotometer cells for all applications Pathlengths from 0.01mm to 100mm Far UV & NIR Quartz Glass & Borosilicate Customized cells Competitive Prices
0659
4001
4001
Absorbance (A)
Absorbance (A)
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