COLUMNS
MOLECULAR SPECTROSCOPY WORKBENCH
Analysis of Lignin and Cellulose in Biological Energy Sources by Raman Microscopy
Cellulosic feedstocks from biological harvests or industrial–urban waste have been proposed as sources for the production of energy in the form of fermentation-produced ethanol biofuel. Because Raman measurements are nondestructive, they can provide information on the relative concentrations of the feedstock components.
Fran Adar

CHEMOMETRICS IN SPECTROSCOPY
Statistics and Chemometrics for Clinical Data Reporting, Part III: Using Excel for Data Plotting
This installment of “Chemometrics in Spectroscopy” illustrates the various graphical ways used to observe and interpret comparative clinical quantitative measurement methods.
Jermome Workman and Howard Mark

ARTICLES
Assessing Accuracy
In a previous article, we discussed the steps in the chemical analysis process (sample taking, sample preparation, analysis, and results) and promised a follow-up on the question of the accuracy of the results. This article examines systematic error and quantitative analysis.
Volker Thomsen

Differentiation Between Origins of Extra Virgin Olive Oils by GC–C-IRMS Using Principal Component Analysis, Linear Discriminant Analysis, and Hierarchical Cluster Analysis
The authors classify extra virgin olive oils from Portugal and Turkey using GC–C-IRMS to evaluate the isotope ratios of the fatty acid methyl esters (FAMEs) extracted from the oils.
Andreas Baum, Yao Lu, Zeland Muccio, Glen P. Jackson, and Peter B. Harrington

CHCA or DHB? Systematic Comparison of the Two Most Commonly Used Matrices for Peptide Mass Fingerprint Analysis with MALDI-MS
The authors present a comprehensive study of MALDI spotting, based upon the most commonly used dried droplet method, for various peptides of different molecular weight and concentration.
Cunjie Zhang, Haixia Zhang, David W. Litchfield, and Ken K.-C. Yeung