Nutritional supplements analysis

Griffith, A.P and Collison, M.W. 2001. Improved methods for the extraction and analysis of isofla-vones from soy-containing foods and nutritional supplements by reversed-phase high-performance liquid chromatography and liquid chroma-tography-mass spectrometry. J. Chromatogr. A 913 397-413. 

A systematic investigation in extraction and analysis of isoflavones from soy-containing foods and nutritional supplements. 

High-performance Liquid Chromatography in the Analysis of Active Ingredients in Herbal Nutritional Supplements... 

Heys SD, Walker LG, Smith I, et al. Enteral nutritional supplementation with key nutrients in patients with critical illness and cancer A meta-analysis of randomized controlled chnical trials. Ann Surg 1999 229 467-477. 

Vitamin D has also been measured in infant formula and adult/pediatric nutritional supplements using UPLC-MS/MS and compared with conventional HPLC-MS/MS [94]. The accuracy of this method was evaluated by the analysis of NIST selected reaction monitoring (SRM) 1849 infant formula reference material. Both saponification and liquid-liquid extraction procedures have been applied for the extraction of vitamins prior to analysis. 

Vasta, J.D. and Sherma, J. 2010. Analysis of lycopene in nutritional supplements by silica gel high-performance thin-layer chromatography with visible-mode densitometry, Acta Chromatogr., 20 673-683. 

Ney M, Vandermeer B, van Zanten SJ, Ma MM, Gramlich L, Tandon P. Meta-analysis oral or enteral nutritional supplementation in cirrhosis. Aliment Pharmacol Ther April 2013 37(7) 672-9. 

Since the focus has been on the ten essential amino acids, most nutritional laboratories have optimized their methods around these plus some of the other protein amino acids. Recently, nutritional supplements have begun to include some of the nonprotein amino acids such as ornithine in their formulations. These nonprotein amino acids may cause interference when analysis is performed by methods optimized for standard nutritional work. There are amino acid analytical methods developed for physiological matrices, which include many of the nonprotein amino acids. These methods may be adapted for nutritional matrices. There is also some... 

Niinez-SeUds, A.J., Vdlez Castro, H.T., Agilero-Aguero, J. et al (2002) Isolation and quantitative analysis of phenolic antioxidants, free sugars, and polyols from mango (Mangifera indica L.) stem bark aqueous decoction used in Cuba as a nutritional supplement. /. Agric. Food Chem., 50, 762-766. 

The use of nutritional supplements in athletes and in the health-conscious recreationally active population is widespread, as it is in the general population. A very large number of surveys have been published. A meta-analysis of 51 published surveys involving 10 274 male and female athletes of varying levels of ability showed an overall prevalence of supplement use of 46%, but the prevalence varied widely in different sports, at different levels of age, performance etc., and in different cultural backgrounds. 

Chem. Analysis 20% min. phosphatidylserine 1.5% max. moisture CAS 8030-76-0 7758-87-4 EINECS/ELINCS 310-129-7 231-840-8 Uses Wetting agent, release agent, o/w emulsifier, stabilizer, nutritional supplements... 

Applications Speciation analysis is particularly important in plant and animal biochemistry and nutrition (food/food supplements), clinical biochemistry, industrial chemistry and environmental chemistry. In the... 

Amino acid analysis has long been of importance for nutritional purposes. Recently, there has been an increasing interest in assessing the exact amino acid composition of new protein sources, infant formulas, nutraceutical-type products, or supplements targeted at people with unusual metabolic needs. There is also a regulatory necessity to have rapid methods available for amino acid determination to verify product consistency with that declared on the label [196]. 

In other independent tests, ConsumerLab.com, a privately held U.S. company that specializes in laboratory analysis of nutritional and herbal supplements for purity, strength, and truth in labeling, found that 15% of creatine supplements tested did not meet industry standards for creatine content, purity, and label claims. 

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