Dionex brings the expertise of extraction and analysis to the forefront of your food testing needs. Whether you are in a government organization, university, contract laboratory, or private industry, we have the right solution for you.

Dionex has solutions for analyzing many food raw materials:

• Cereals and grains
• Dairy products
• Meat, poultry and fish
• Additives
• Animal feed
• Tobacco

Iodide in Baby Formula

The iodide which is added to baby formula can be reliably determined by ion-exchange separation, combined with integrated pulsed amperometric detection (IPAD). Dionex has improved the ease-of-use of amperometric detection with the development of disposable working electrodes. This innovation simplifies and improves long-term reliability by eliminating the polishing step usually required for maintaining working electrode sensitivity. This analysis was performed using disposable silver electrodes. This method is also applicable to whole milk and evaporated milk products.

Vanillin in Yogurt

Flavor components, such as vanillin added to yogurt, can be determined by separation on a high-capacity anion-exchange column, using a high pH eluent. Vanillin, a carbohydrate, is anionic in this high pH environment, and is retained and separated by anion exchange and quantified using pulsed amperometric detection on a gold electrode.

Hop Extract Analysis

A Dionex HPLC system, in combination with the Dionex Acclaim 120 C18 5 µm column and UV detection, can be used to analyze hop extracts. This HPLC technology can also be used to determine the concentrations of hop extracts in a beer sample.

Maltodextrins – Maltrin

Polymeric distributions of maltodextrins (nonsweet nutritive saccharide polymers), determined using pulsed amperometric detection (PAD) and a high pH eluent.

Chicory Inulin

Inulin polymers are natural products added to many food preparations to improve texture. This slide illustrates how HPAE-PAD can be used to quantify the polymeric distribution of inulin derived from chicory. This degree of quantitative distribution of these polymers is impossible to achieve by any other analytical technique.

Dahlia Inulin

Here HPAE-PAD is used to quantify the polymeric distribution of inulin in dahlia.

Improved Chain-Length Resolution of Inulin Polymers

Inulin based products, derived from chicory root, Jerusalem artichokes, and other sources, are marketed as fat replacers and dietary fiber additives in food formulations. Quality control of inulin materials is difficult, because of their extremely complex nature. Using high pH eluent, inulin polymers are anionic and therefore easily separated on an anion exchange column. The CarboPac PA100 column has been used successfully for inulin product quality control. The CarboPac PA200 delivers improved resolution of these polymers over the original PA100.

Amylopectin Structure

Amylopectins are the principal component in most starches and they are among the largest molecules found in nature. They play a major role in the quality of food products. The n number determines the length of the amylopectin polymer.

Amino Acids in Soybean Powder

The amino acid content of food products such as soybean powder can be determined using acid or base hydrolysis and Dionex AAA-Direct™ analysis. Anion-exchange separation of the amino acids is followed by direct determination using pulsed amperometric detection (PAD), without either pre- or post-column derivitization.

Amino Acids in Unprocessed Meat

Application of the Dionex AAA-Direct technology, used to quantify amino acids in unprocessed meat.

Food Sugars and Sugar Alcohols

Pulsed amperometric detection (PAD) at a gold electrode for sensitive and selective determination of food sugars and sugar alcohols. In the diagram at the lower right, the red section documents the area where electrode current is measured. The subsequent potential changes show the step change to a negative potential, which cleans the gold electrode. The following step change returns the electrode to its original condition, ready to electrolyze the carbohydrate compound at the targeted potential. This process happens several times per second and produces the chromatographic trace seen on the left. PAD provides rugged and reliable carbohydrate detection.

Separation of Reduced Carbohydrates in Foods and Beverage

The CarboPac MA1 column, with high capacity and exceptional carbohydrate selectivity, is the most powerful column available for separating a wide range of carbohydrates.

Sugars and Sugar Cane Molasses

The determination of sugars in molasses using the official method of International Commission for Uniform Methods of Sugar Analysis (ICUMSA) approved in 1994 is shown here. Excellent reproducibility was obtained and the results were in close agreement with a parallel GC collaborative study. The advantages cited for the new method were: 1) Lack of coelution with non-sugar impurities 2) Greatly reduced possibility of over-estimation of sugars due to coeluting impurities.

IC/MS of Sugar Alcohols and Mono- and Disaccharides

While compounds are typically identified using their specific retention time, the use of the Mass Spectrometric detector provides more positive identification of the separated compounds. This IC/MS chromatogram is an outstanding example of the power of this technique to deliver sensitive analysis with positive compound identification.