ISO 14502-2-2005 cor1-2006 PDF

Full title and description

ISO 14502-2:2005/Cor 1:2006 — Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea — Method using high-performance liquid chromatography — Technical Corrigendum 1. This corrigendum provides technical/editorial corrections to the published ISO 14502-2:2005 method and is issued as Corrigendum 1 (2006) to the 2005 edition.

Abstract

ISO 14502-2:2005 specifies a high-performance liquid chromatographic (HPLC) procedure for determining the total catechin content of tea by summing individual catechins. The method is applicable to leaf and instant green tea and — with precision limitations — to black tea; it also allows determination of related analytes such as gallic acid and caffeine. The Corrigendum 1:2006 issues technical corrections to the 2005 text.

General information

• Status: Published (Corrigendum to ISO 14502-2:2005).
• Publication date: 24 March 2006 (Corrigendum published in 2006; ISO catalogue lists the corrigendum edition as 2006-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 67.140.10 — Tea.
• Edition / version: Corrigendum 1 to Edition 1 (ISO 14502-2:2005); Corrigendum edition 1 (2006).
• Number of pages: 2 (corrigendum document).

Scope

The corrigendum applies to ISO 14502-2:2005 and provides technical and/or editorial corrections to the original HPLC method text (it does not replace the 2005 standard; users should apply the corrigendum together with the full 2005 standard when performing analyses). The underlying standard (ISO 14502-2:2005) defines the analytical procedure for catechins in green tea.

Key topics and requirements

• HPLC-based analytical method for quantifying individual catechins and summing them to report total catechin content in green tea.
• Applicability to leaf and instant green teas; limited precision for application to black tea.
• Possibility to determine related compounds (gallic acid, caffeine, theogallin, theaflavins) within the same chromatographic framework.
• Corrigendum provides corrections to the published text (technical/editorial) and should be read alongside the original 2005 publication.

Typical use and users

Used by analytical/quality-control laboratories in the food and beverage industry, tea producers and packers, research laboratories studying tea composition, and regulatory bodies requiring standardized measurement of catechins and related tea constituents. Laboratories implementing ISO 14502-2:2005 should incorporate the Corrigendum 1:2006 corrections into their procedures.

Related standards

ISO 14502 series (notably ISO 14502-1:2005 — Content of total polyphenols in tea by Folin–Ciocalteu colorimetric method) and other tea-related ISO documents (e.g., standards on tea grading and sampling). The 14502-1 and 14502-2 parts were each issued in 2005 and issued technical corrigenda in 2006.

Keywords

ISO 14502-2, corrigendum, tea analysis, catechins, green tea, HPLC, gallic acid, caffeine, polyphenols, ISO/TC 34/SC 8.

FAQ

Q: What is this standard?

A: It is the technical corrigendum (Corrigendum 1, 2006) to ISO 14502-2:2005, which corrects or clarifies parts of the HPLC method specified in the 2005 edition for determining catechins in green tea.

Q: What does it cover?

A: The underlying standard (ISO 14502-2:2005) covers an HPLC method for measuring individual catechins and calculating total catechin content in green tea (also allowing determination of gallic acid and caffeine); the corrigendum issues technical/editorial corrections to that text.

Q: Who typically uses it?

A: Food and beverage analytical and QC laboratories, tea producers and processors, academic researchers in food chemistry, and regulatory/standards bodies that require reproducible, standardized measurement of tea constituents.

Q: Is it current or superseded?

A: The document is a published corrigendum (2006) to the 2005 edition. It does not by itself supersede the 2005 standard; it corrects that edition. Users should check the ISO catalogue or national SDOs for any later revisions or replacements of ISO 14502-2 beyond 2005/2006.

Q: Is it part of a series?

A: Yes — ISO 14502 is a multi-part series on determination of substances characteristic of green and black tea (for example, Part 1 covers total polyphenols by Folin–Ciocalteu and Part 2 covers catechins by HPLC). Corrigenda were issued for both parts in 2006.

Q: What are the key keywords?

A: Catechins; green tea; HPLC; tea analysis; ISO 14502-2; corrigendum; polyphenols; gallic acid; caffeine; ISO/TC 34/SC 8.