John Szpylka

John Szpylka
Silliker (Mérieux NutriSciences) · Department of Chemistry

PhD

About

55
Publications
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437
Citations

Publications

Publications (55)
Article
Background: The need for an updated reference method for folate was identified as a priority by the AOAC's Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN) in 2011. An Expert Review Panel (ERP) found AOAC Official MethodSM 2011.06 suitable for the purpose and recommended it as a First Action Official Method. Objective: To determi...
Article
AOAC SMPRs describe the minimum recommended performance characteristics to be used during the evaluation of a method. The evaluation may be an on-site verification, a single-laboratory validation, or a multi-site collaborative study. SMPRs are written and adopted by AOAC stakeholder panels composed of representatives from the industry, regulatory o...
Article
Full-text available
you can find the full SMPR on the AOAC web site:- http://www.aoac.org/aoac_prod_imis/AOAC_Docs/SMPRs/SMPR_2018_001.pdf
Article
This AOAC Standard Method Performance Requirements (SMPR) is for authentication of Echinacea phenolic compounds in dietary ingredients and supplements. SMPRs describe the minimum recommended performance characteristics to be used during the evaluation of a method. The evaluation may be an on-site verification, a single-laboratory validation, or a m...
Data
Appendix S1. Evidence map search terms and additional summary tables.
Article
Full-text available
Cooking foods affords numerous food safety benefits. During heating, Maillard reaction products (MRPs) are formed. MRPs contribute sensory aspects to food, including color, taste, and texture. One MRP, acrylamide, has been implicated in negative health outcomes; however, emerging data suggests MRPs may also deliver certain health benefits. The food...
Article
During heating, hundreds Maillard reaction products (MRPs) can form in foods that contain reducing sugars and amino nitrogen groups, which provide browning and positive sensory aspects to a food. Recent in vitro and animal evidence suggests many MRPs may contribute to promoting health. However, literature has focused primarily on one MRP – acrylami...
Article
The method for "Determination of Total Folates in Infant Formula and Adult Nutritionals by Trienzyme Extraction and UPLC-MS/MS Quantitation" was submitted to the Folate Working Group for consideration for adoption as Official First Action by AOAC INTERNATIONAL. This method uses ultra performance liquid chromatography/tandem mass spectrometry (UPLC-...
Article
A colorimetric method for the determination of total antioxidant activity in a variety of foods and beverages was validated in both a single-laboratory validation and a collaborative laboratory validation study. The procedure involved extraction of the antioxidants directly into a methanol-water solution containing a known amount of 2,2'-diphenyl-1...
Article
Full-text available
An AOAC collaborative study was conducted to evaluate an affinity LC procedure for measuring immunoglobulin G (IgG) in selected dairy powders. The powders were extracted with 0.15 M sodium chloride solution and the pH was adjusted to 4.6 to precipitate caseins, which would otherwise lead to an overestimation of IgG. The analyte was then bound to a...
Article
Twelve laboratories representing 4 countries participated in an interlaboratory study conducted to determine all-trans-β-carotene and total β-carotene in dietary supplements and raw materials. Thirteen samples were sent as blind duplicates to the collaborators. Results obtained from 11 laboratories are reported. For products composed as softgels an...
Article
Twelve laboratories representing 4 countries participated in an interlaboratory study conducted to determine all-trans-veta-carotene and total beta-carotene in dietary supplements and raw materials. Thirteen samples were sent as blind duplicates to the collaborators. Results obtained from 11 laboratories are reported. For products composed as softg...
Article
Full-text available
In 1996, U.S. Food and Drug Administration regulations mandated the fortification of enriched cereal-grain products with folic acid, thereby emphasizing the need for validated methods for total folates in foods, particularly cereal products. The AOAC Official Methods (944.12, 960.46) currently used for the analysis of folate in foods for compliance...
Article
Sampling methods are described, suitable for mass spectrometric identification of volatile species in aqueous solutions. Submillimolar concentrations of oxygen and carbon dioxide were sampled during electrolysis and identified within a second of the time they were electrolyzed. The electrolysis process modulates solution concentrations near a 100 μ...
Article
Thesis (Ph. D.)--Ohio State University, 1991. Includes bibliographical references. Advisor: Larry B. Anderson, Dept. of Chemistry.

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