Admin: 4 revisions imported

2019-05-09T13:33:11Z

4 revisions imported

Admin: Protected "Vitamin A" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))

2018-01-08T12:29:37Z

Protected "Vitamin A" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))

Admin at 08:15, 23 November 2017

2017-11-23T08:15:54Z

Admin at 07:40, 21 November 2017

2017-11-21T07:40:07Z

Admin: Created page with "
Figure 1. All-''trans''-retinol, C₂₀H₃₀O, Mw =286,45 g/mol. The group of vitamin A includes retinol, its esters and some isomers. Vitamin A subst..."

2017-05-12T15:31:18Z

Created page with " Figure 1. All-''trans''-retinol, C20H30O, Mw =286,45 g/mol. The group of vitamin A includes retinol, its esters and some isomers. Vitamin A subst..."

New page

Figure 1. All-''trans''-retinol, C20H30O, Mw =286,45 g/mol.

The group of vitamin A includes retinol, its esters and some isomers. Vitamin A substances from animal sources are called retinoids and these include all-trans-retinol, retinylesters and cis-isomers. Carotenoids (provitamin A) are present in plants, such as fruits and vegetables, and this group includes ?-carotene, ?-carotene, ?-carotene and ?-cryptoxanthin.

Synonyms for vitamin A:

* retinol, axerophthol, vitamin A1.

[https://metrofood-wiki.foodcase-services.com/index.php?title=Summary+-+all-trans-retinol+and+13-cis-retinol Summary - measurement of all-trans-retinol and 13-cis-retinol]

[https://metrofood-wiki.foodcase-services.com/index.php?title=pages/viewpage.action?pageId=93727059 Summary - measurement of beta-carotene]

-----

=== Golden standard ===

There are two European Standards concerning the determination of vitamin A. Methods are described in child pages where you can get by clicking the links below:

[https://metrofood-wiki.foodcase-services.com/index.php?title=Measurement+of+all-trans-retinol+and+13-cis-retinol EN 12823-1:2000 Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 1: Measurement of all-trans-retinol and 13-cis-retinol]

[https://metrofood-wiki.foodcase-services.com/index.php?title=pages/viewpage.action?pageId=93723977 EN 12823-2:2000 Foodstuffs - Determination of vitamin A by high performance liquid chromatography - Part 2: Measurement of Beta-carotene]

=== Proficiency testing schemes ===

Here are listed some completed, on-going and/or upcoming proficiency testing schemes concerning vitamin A:

[http://www.slv.se/upload/dokument/rapporter/Kvalitetssakring_lab/2011/2011%20Swedish%20National%20Food%20Agency%2024,%20Proficiency%20testing%20-%20Vitamins%20in%20Food,%20Round%20V-9.pdf Livsmedelsverket, National Food Agency of Sweden - Report 24 (2011) Vitamins in Foods - Round V-9]

[http://otis.jtlnet.com/~proficie/proficiencytesting.com.au/documents/651.pdf PTA - Proficiency Testing Australia: Report No. 651, Food Proficiency Testing Program, Round 31 - Vitamins]

[http://drrr.fdi-works.de/en/catalogue/ DRRR - Deutsches Referenzbüro für Lebensmittel-Ringversuche und Referenzmaterialien]

[http://www.dla-lvu.de/english/DLA%20Programm%202012%20english.html DLA - Dienstleistung Lebensmittel Analytik GbR: 32/2012 Food Supplement I: Vitamins A, D3, E, K1 and beta-Carotin]

[http://www.lgcpt.com/PTCatalogue/en-GB/PTCatalogue.pdf LGC - Dairy Chemistry PT schemes (QDCS)]

Some upcoming proficiency testing schemes can be found in the [http://www.eptis.bam.de/en/index.htm EPTIS database].

=== Other methods available ===

* [http://methods.aaccnet.org/summaries/86-01-02.aspx AACC 86-01.02] Vitamin A---Ultraviolet Absorption Method
* [http://methods.aaccnet.org/summaries/86-02-01.aspx AACC 86-02.01] Vitamin A---Carr-Price Method
* [http://methods.aaccnet.org/summaries/86-03-01.aspx AACC 86-03.01] Vitamin A in Enriched Flour
* [http://methods.aaccnet.org/summaries/86-05-01.aspx AACC 86-05.01] Vitamin A and Carotene
* [http://methods.aaccnet.org/summaries/86-06-01.aspx AACC 86-06.01] Analysis of Vitamins A and E by High-Performance Liquid Chromatography
* AOAC 960.45 Vitamin A in margarine
** spectrophotometric
* [http://www.aoac.org/omarev1/974_29.pdf AOAC 974.29] Vitamin A in mixed feed, premixes, and human and pet foods (Codex adopted - AOAC Method)
** colorimetric
* [http://www.aoac.org/omarev1/992_04.pdf AOAC 992.04] Vitamin A (retinol isomers) in milk and milk-based infant formula (Codex adopted - AOAC Method)
** liquid chromatographic
* [http://www.aoac.org/omarev1/992_06.pdf AOAC 992.06] Vitamin A (retinol) in milk-based infant formula (Codex adopted - AOAC Method)
** liquid chromatographic
* [http://www.aoac.org/omarev1/2001_13.pdf AOAC 2001.13] Determination of vitamin A in foods
** liquid chromatographic
* [http://www.iso.org/iso/catalogue_detail.htm?csnumber=53830 ISO 12080-1:2009] Dried skimmed milk - Determination of vitamin A content -- part 1: Colorimetric method
* [http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=53831 ISO 12080-2:2009] Dried skimmed milk - Determination of vitamin A content -- part 2: Method using high performance liquid chromatography
* [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=12960 ISO 6558-2:1992] Fruits, vegetables and derived products -- Determination of carotene content -- Part 2: Routine methods

=== Literature ===

* see separate child page below

== EuroFIR assistance to this method/guidelines ==

-----

@@ Line 2: / Line 2: @@
 <br /> Figure 1. All-''trans''-retinol, C<sub>20</sub>H<sub>30</sub>O, Mw =286,45 g/mol.
-The group of vitamin A includes retinol, its esters and some isomers. Vitamin A substances from animal sources are called retinoids and these include all-trans-retinol, retinylesters and cis-isomers. Carotenoids (provitamin A) are present in plants, such as fruits and vegetables, and this group includes ?-carotene, ?-carotene, ?-carotene and ?-cryptoxanthin.
+The group of vitamin A includes retinol, its esters and some isomers. Vitamin A substances from animal sources are called retinoids and these include all-trans-retinol, retinylesters and cis-isomers. Carotenoids (provitamin A) are present in plants, such as fruits and vegetables, and this group includes β-carotene, α-carotene, γ-carotene and β-cryptoxanthin.
 Synonyms for vitamin A:

← Older revision		Revision as of 07:40, 21 November 2017
Line 1:		Line 1:
		+	[[File:retinoli.JPG]]
	<br /> Figure 1. All-''trans''-retinol, C<sub>20</sub>H<sub>30</sub>O, Mw =286,45 g/mol.		<br /> Figure 1. All-''trans''-retinol, C<sub>20</sub>H<sub>30</sub>O, Mw =286,45 g/mol.

← Older revision	Revision as of 13:33, 9 May 2019
(No difference)

← Older revision	Revision as of 12:29, 8 January 2018
(No difference)

Vitamin A - Revision history

Admin: 4 revisions imported

Admin: Protected "Vitamin A" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite))

Admin at 08:15, 23 November 2017

Admin at 07:40, 21 November 2017

Admin: Created page with " Figure 1. All-''trans''-retinol, C20H30O, Mw =286,45 g/mol. The group of vitamin A includes retinol, its esters and some isomers. Vitamin A subst..."

Admin: Created page with "
Figure 1. All-''trans''-retinol, C₂₀H₃₀O, Mw =286,45 g/mol. The group of vitamin A includes retinol, its esters and some isomers. Vitamin A subst..."