www.americanlaboratory.com AL Volume 49, Number 5 | June/July 2017 FEATURED ARTICLES
Pesticide Testing for the Cannabis Industry: The Importance of LC-MS/MS for Obtaining Accurate Results in a Complex Matrix ............................. 10
by P.C. Winkler, D. Egerton, C. Butt, A. Quinn-Paquet, K.C. Hyland, P. Taylor, and D. Monk
High-performance liquid chromatography-tandem mass spectrometry has emerged as the method of choice for pesticide analysis.
Particulate Analysis of Liquid Filtration Materials and Residues in Food Using FTIR Microscopy .................. 16
by M. Bradley and S. Lowry
On the Cover Microcrystal test for oxycodone using platinic bromide solution. Technique: polarized
light; 200×. Image captured by Kelly Brinsko, McCrone Research Institute, Chicago, Illinois, U.S.A. Image of Distinction in the 2016 Nikon Small World Photomicrography Competition. For more information, visit
www.nikonsmallworld.com.
AL1707
Two sets of analyses are presented—one involving liquid filtration and the other examining particulate residues in food items—using a simple-to-operate FTIR microscope and attenuated total reflection sampling.
How to Avoid Size Mismatch Between Solutes and Column Pores for Optimum HPLC Performance .............. 22
by R.A. Henry and S.A. Schuster
This article describes a new approach for selecting optimum column pores for separating large molecules while maintaining high performance.
Scalable Synthesis Technology ..................................... 31 by P. Wenter
A DNA synthesis platform addresses the need for smaller-scale oligo production without sacrificing quality, accuracy, or turnaround time.
Using Raman Spectroscopy for Gemstone Analysis ......... 32 by F.J. Yang, G. Pereira, and L. Don Chen
Raman spectroscopy is a nondestructive, extremely fast, and low-cost option for gemstone analysis.
What is Shear Rate and Why is it Important? ................. 35 by D. Moonay
Proper equipment selection may allow significantly different materials to be tested with one machine and geometry, merely by changing the testing speed or shear rate.
A New Era in Filtered Fume Enclosure Safety ................. 44 The latest ductless filtered fume enclosures are a vital resource in the safe and effective operation of modern industrial, educational, hospital, forensic, and pharmaceutical scientific laboratories.
AMERICAN LABORATORY 2 JUNE/JULY 2017
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