New Reference Materials for Elemental Analysis and Isotope Ratio Testing in Food:
Expanded Food Matrix Material Offering

Matthias Nold, Product Manager Reference Materials

Expanded Food Matrix MaterialEveryone is concerned that the food we eat and the beverages we drink are safe and correctly labeled. Food scandals, which have included the detection of instances of food fraud and adulteration, frequently remind us that the quality of food is not to be taken for granted and should be monitored constantly by the food industry and regulators.

Enforcement of food regulations requires reliable and efficient testing methods. To ensure that these methods lead to traceable and comparable test results, well characterized reference materials need to be available.

As part of our comprehensive offering of reference materials for food and beverage testing, we provide a range of more than 150 food matrix materials intended for method development, method validation, or routine analysis. On our website SigmaAldrich.com/foodmatrix these products can be browsed by analyte type or matrix, making it easy to locate products for a certain area of interest.

This portfolio is now complemented with a new range of twelve products certified for element content of Carbon, Hydrogen, Nitrogen and/or Sulfur. Some of the products are certified for an isotope ratio of 13C, 15N and/or 34S (see table for details).

Stable isotope analysis is often applied to detect adulteration of food, since the isotope ratio can be different depending on the source of a material.

The values for Carbon, Hydrogen, Nitrogen and Sulfur were determined by an elemental analyser calibrated to suitable materials from the National Institute of Standards and Technology (NIST), Maryland, USA. The isotope values are traceable to primary isotopic Certified Reference Materials (CRM) issued by IAEA Vienna.

Materials

Matrix Parameters Package Size Cat. No.
Alfalfa Carbon, Hydrogen, Nitrogen and Sulfur   30 g EMB2273
Coconut Shell Carbon, Hydrogen and Nitrogen   30 g EMB2168
Olive Oil δ 13C     5 g EMB2172
Olive Stone Carbon, Hydrogen and Nitrogen   30 g EMB2170
Pasta Nitrogen 100 g EMB2149
Pasta Nitrogen   10 g EMB2140
Protein Nitrogen   30 g EMB2154
Rice Flour Carbon, Hydrogen, Nitrogen and Sulfur
  30 g EMB2278
Sorghum Flour Carbon, Nitrogen and Sulfur
  30 g EMB2158
Sorghum Flour Carbon, Nitrogen and Sulfur, δ 13C, δ 15N, δ 34S     5 g EMB2159
Wheat Flour Carbon, Hydrogen and Nitrogen   30 g EMB2156
Wheat Flour Carbon, Nitrogen and Sulfur, δ 13C, δ 15N, δ 34S     5 g EMB2157