AOAC Final Action Methods in 2017

842 J OSEPH ET AL . : J OURNAL OF AOAC I NTERNATIONAL V OL . 101, N O . 3, 2018

Sneh Bhandari and Tiffany Gallegos-Peretz, M´erieux NutriSciences (Crete, IL) Elaine Marley and Dave Leeman, R-Biopharm Rh ˆ one Ltd (Glasgow, United Kingdom) Hua Chen and Yan Green, Mead Johnson (Guangzhou, China) Maurice Seegers and Nico Dekker, Mead Johnson (Nijmegen, The Netherlands) Esther Campos Gimenez, Nestl´e Research Centre (Lausanne, Switzerland) David Wollard, Eurofins (Penrose, New Zealand) Adrienne McMahon, Wyeth Nutrition (Askeaton, Ireland) (1) Bonjour, J. (1991) in Handbook of Vitamins , L.J. Machlin (Ed.), Marcel Dekker, Inc., New York, NY, pp 393 – 425 (2) Woollard, D.C., & Indyk, H.E. (2013) in B Vitamins and Folates: Chemistry, Analysis, Function and Effects , V.R. Preedy (Ed.), RSC Publishing, London, United Kingdom, pp 377 – 395 (3) Livaniou, E., Costopoulou, D., Vassiliadou, I., Leondiadis, L., Nyalala, J.O., Ithakissios, D.S., & Evangelatos, G.P. (2000) J. Chromatogr. A 881 , 331 – 343. doi:10.1016/S0021-9673(00)00118-7 (4) Frappier, F. (1993) Biotin: Properties and Determination in Encyclopedia of Food Sciences; Food Technology and Nutrition , Academic Press, London, United Kingdom, pp 395 – 399 (5) Lah´ely, S., Ndaw, S., Arella, F., & Hasselmann, C. (1999) Food Chem. 65 253 – 258. doi:10.1016/S0308-8146(98)00185-X (6) EN 15607:2009 Foodstuffs – Determination of d-biotin by HPLC, http://www.freestd.us/soft/267244.htm (7) H¨oller, U., Wachter, F., Wehrli, C., & Christian, F. (2006) J. Chromatogr. B Anal. Technol. Biomed. Life Sci. 831 , 8 – 16. doi:10.1016/j.jchromb.2005.11.021 (8) Bitsch, R., Salz, I., & Hotzel, D. (1989) Int. J. Vitam. Nutr. Res. 59 , 59 – 64 (9) Official Methods of Analysis (2014) 20th Ed., AOAC INTERNATIONAL, Rockville, MD, SMPR 2012.005 (10) Official Methods of Analysis (2016) 20th Ed., AOAC INTERNATIONAL, Rockville, MD, Appendix F (11) Joseph, G., Devi, R., Marley, E.C., Leeman, D., Sullivan, D., Austad, J., Bhandari, S., Campos-Gimen´ez, E., McMahon, A., Christiansen, S., Cruijsen, H., van Loon, W., DeVries, J., Gill, B., Gilliland, D., Schimpf, K., Huang, M., Kneeteman, E., Ofitserova, M., Phillips, S., Raffler, G., Rimmer, K., Phillips, M., Woollard, D., & Yang, J. (2016) J. AOAC Int. 99 , 1110 – 1112. doi: 10.5740/jaoacint.16-0155 (12) Appendix L: AOAC Recommended Guidelines for Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN) Single- Laboratory Validation, http://www.eoma.aoac.org/app_l.pdf (13) Official Methods of Analysis (2016) 20th Ed., AOAC INTERNATIONAL, Rockville, MD, Method 2016.02 (14) Official Methods of Analysis (2016) 20th Ed., AOAC INTERNATIONAL, Rockville, MD, Appendix D (15) AOAC Interlaboratory Study Workbook Version 2.1 – Blind (Unpaired) Replicates (2008) AOAC INTERNATIONAL, Gaithersburg, MD References

use of syringe filters with extractable chromophores. It was advised to test the filters as part of the reagent blank preparation.

Quality Water

The quality of the water, especially the water used for the final extraction, is very important in order to get clean chromatography. Type 1 water is recommended, and this information will be updated in the method.

Ultra-Performance LC Platform

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The availability of stationary phase (solid-core, Kinetex Phenyl-Hexyl) in smaller particle sizes for ultra-performance LC platforms is encouraging. This would significantly reduce analysis time and improve throughput. My laboratory is doing further work to validate this change.

Calculation Errors

The calculation error was a common problem that was noticed. Participants were advised to use reference samples to prompt any issues with calculation before reporting the results.

Acknowledgments

We would like to thank the following individuals for their support during the course of method setup and the MLT study: Simon Bevis and Elaine Marley of R-Biopharm Rh ˆ one Ltd (Glasgow, United Kingdom) for supporting the program by providing IACs; Neil Choi of DTS Food Laboratories (Melbourne, Australia) for analyzing the SPIFAN matrixes using the LC-MS/MS method; and Shellie Stassie of Covance Laboratories Inc. (Madison, WI) for organizing the MLT samples. We would like to thank the following individuals for their participation in this study: Karen Schimpf and Linda Butler Thompson, Abbott Laboratories (Columbus, OH) Isabelle Malaviole, Aquanal Laboratoire Aquitaine Analyses (Pessac, France) Michael Hodgson, George Joseph, and Ranjani Devi, AsureQuality Ltd (Auckland, New Zealand) Craig Macfadzean, Xinping Huo, and Felicia Lim, AsureQuality Singapore Pte. Ltd (Singapore) Jirong Wang, Trevor Gill, and Lee Kennedy, DTS Food Laboratories (Melbourne, Australia) Sudhakar Yadlapalli, FirstSource Laboratory Solutions LLP (Hyderabad, India) Harvey Indyk, Brendon Gill, Mumtaz Dole, and Cesar Yin, Fonterra Co-operative Group (Waitoa, New Zealand)