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Sertl D, Malone W, Beljaars P, Blake C, Byerly C, Chadha RK, Daniels T, Duda C, Liu J, McShane B, Parns N, Pollman R, Ponto K, Sertl D, Soloman B, Stemp A, Vaessen H. Liquid Chromatographic Method for Determination of Iodine in Milk: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/76.4.711] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Nine laboratories participated in an AOAC International/ International Dairy Federation collaborative study on a liquid chromatographic (LC) method for determination of iodine in milk. Liquid milk is passed through a 25 000 MW membrane filter to remove protein and insoluble material. Iodine (in the form of iodide) in the clear filtrate is separated by reversed-phase ion-pair LC and is detected electrochemically. Participants analyzed 2 commercial pasteurized whole milks and 5 nonfat dry milk powders in blind duplicate. Each sample was tested in duplicate on 2 days. Repeatability and reproducibility standard deviations (sr and SR, respectively) and repeatability and reproducibility relative standard deviations (RSDr and RSDR, respectively) for determinations of iodine in whole milk (mean recovery, 86.7%) were as follows: sr, 22 μg/L; SR, 22 μg/L; RSDr, 8.2%; and RSDR, 8.3%. For powdered milk (mean recovery, 91 %), the values were as follows: sr, 0.14 μg/g; SR, 0.22 μg/g; RSDr, 9.0%; and RSDR, 12.7%. The method was adopted first action by AOAC International.
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Affiliation(s)
- David Sertl
- Ross Laboratories, 625 Cleveland Ave, Columbus, OH 43215
| | - William Malone
- Ross Laboratories, 625 Cleveland Ave, Columbus, OH 43215
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Matulis R, Beljaars P, Brunner C, De Vries E, Jensen T, Rugheb H, Scott P, Slahck S. Fellows Committee. J AOAC Int 1999. [DOI: 10.1093/jaoac/82.2.550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Raymond Matulis
- Analytical Sciences Management Consultants, Inc., 3901 Radcliffe Dr, Northbrook, IL 60062, USA
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