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Ložnjak Švarc P, Oveland E, Strandler HS, Kariluoto S, Campos-Giménez E, Ivarsen E, Malaviole I, Motta C, Rychlik M, Striegel L, Jakobsen J. Collaborative study: Quantification of total folate in food using an efficient single-enzyme extraction combined with LC-MS/MS. Food Chem 2020; 333:127447. [PMID: 32688304 DOI: 10.1016/j.foodchem.2020.127447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 06/24/2020] [Accepted: 06/27/2020] [Indexed: 12/16/2022]
Abstract
Quantification of the specific folate vitamers to estimate total folate in foods is not standardized. A collaborative study, including eight European laboratories, was conducted in order to determine the repeatability and reproducibility of the method for folate quantification in foods using the plant-origin γ-glutamyl hydrolase as part of the extraction procedure. The seven food samples analyzed represent the food groups; fruits, vegetables, dairy products, legumes, offal, fish, and fortified infant formula. The homogenization step was included, and six folate vitamers were analyzed using LC-MS/MS. Total folate content, expressed as folic acid equivalent, was 17-490 μg/100 g in all samples. Horwitz ratio values were within the acceptable range (0.60-1.94), except for fish. The results for fortified infant formula, a certified reference material (NIST 1869), confirmed the trueness of the method. The collaborative study is part of a standardization project within the Nordic Committee on Food Analysis (NMKL).
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Affiliation(s)
- Petra Ložnjak Švarc
- National Food Institute, Technical University of Denmark, Kemitorvet, 2800 Kgs. Lyngby, Denmark.
| | - Eystein Oveland
- Institute of Marine Research, P. O. Box 1870, Nordnes, N-5817 Bergen, Norway.
| | | | - Susanna Kariluoto
- University of Helsinki, Department of Food and Nutrition, Agnes Sjöbergin katu 2, FI-00790 Helsinki, Finland.
| | - Esther Campos-Giménez
- Nestle Research, Route du Jorat 57, Vers-chez-les-Blanc, 1000 Lausanne 26, Switzerland.
| | - Elise Ivarsen
- Eurofins Vitamin Testing, Ladelundvej 85, 6600 Vejen, Denmark.
| | | | - Carla Motta
- National Health Institute, Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016 Lisbon, Portugal.
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technical University of Munich, Max-von-Imhof Forum 2, DE-85354 Freising, Germany; Centre for Nutrition and Food Sciences, University of Queensland, St Lucia QLD 4069, Australia.
| | - Lisa Striegel
- Chair of Analytical Food Chemistry, Technical University of Munich, Max-von-Imhof Forum 2, DE-85354 Freising, Germany.
| | - Jette Jakobsen
- National Food Institute, Technical University of Denmark, Kemitorvet, 2800 Kgs. Lyngby, Denmark.
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