ISO 709-2001 PDF

Full title and description

ISO 709:2001 — Essential oils — Determination of ester value. This International Standard specifies a quantitative method for determining the ester value of an essential oil (expressed as mg KOH/g or equivalent), including reagents, procedure, calculation and expression of results; it excludes oils containing lactones or an appreciable proportion of aldehydes.

Abstract

This standard describes a chemical (typically titrimetric) procedure to determine the ester value of essential oils. It gives the required reagents, apparatus, step‑by‑step procedure, calculation method and conditions under which the method is not applicable (notably when lactones or a significant proportion of aldehydes are present). The method is intended for use in routine quality control and comparative testing of essential oils.

General information

• Status: Published (International Standard; edition confirmed by ISO reviews).
• Publication date: September 2001 (ISO, edition 2, 2001-09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.100.60 (Essential oils) — Technical Committee: ISO/TC 54.
• Edition / version: Edition 2 (2001).
• Number of pages: 6 pages in the ISO-published edition (national adoptions/publishers such as BSI may show different pagination; e.g., BS ISO 709:2001 listing shows 14 pages in that publication format).

Scope

ISO 709:2001 specifies a method for determination of the ester value of an essential oil. The procedure is intended for essential oils where ester content can be determined reliably by the described method; it is not applicable to essential oils that contain lactones or an appreciable proportion of aldehydes because these compounds interfere with the test chemistry. The standard is used as a reference test method in quality specifications and in product standards that reference testing methods for essential oils.

Key topics and requirements

• Definition of ester value and units of expression (calculation as mg KOH per g of oil or equivalent expression).
• Required reagents and purity criteria (solvents, standardized titrant, indicators or potentiometric titration options).
• Detailed sample preparation and titration procedure (conditions, volumes, temperatures where specified).
• Calculation procedure, expression of results and rounding rules.
• Statement of applicability limits and interferences (not suitable for oils with lactones or appreciable aldehydes).
• Normative and informative references to related ISO test methods used by essential‑oil standards.

Typical use and users

Analytical and quality‑control laboratories, essential‑oil producers (flavour and fragrance industries), cosmetic ingredient suppliers, regulatory/testing bodies and standardization committees use ISO 709:2001 to assess and document ester content as part of product specifications, acceptance testing, batch release and comparative quality checks. The method is commonly cited by product standards for specific oils.

Related standards

ISO 709:2001 is one of a set of ISO test methods for essential oils and is frequently referenced alongside standards such as ISO 1241 (determination of ester values before and after acetylation), ISO 1242 (acid value), ISO 592 (optical rotation) and sampling/test method standards used in essential‑oil product specifications (e.g., ISO 3515 for oil of lavender and ISO 8901 for oil of bitter orange), among others. Product‑specific standards typically list ISO 709 as the normative test for ester value.

Keywords

essential oils; ester value; ester number; titration; chemical test method; ISO/TC 54; quality control; fragrance; flavor; analytical method.

FAQ

Q: What is this standard?

A: ISO 709:2001 is an International Standard that specifies a test method to determine the ester value of essential oils. It provides the laboratory procedure, reagents, calculation and reporting format.

Q: What does it cover?

A: It covers the titrimetric (chemical) determination of the ester value of essential oils, including preparation, titration, calculation and applicability limits. It explicitly excludes oils containing lactones or an appreciable proportion of aldehydes because these interfere with the method.

Q: Who typically uses it?

A: Quality control and analytical laboratories, essential‑oil producers and suppliers, cosmetic and flavour manufacturers, conformity assessment bodies and standards writers use the method for product specifications and routine testing.

Q: Is it current or superseded?

A: ISO 709:2001 (edition 2) is the published ISO edition from 2001 and, per ISO lifecycle records, was subject to periodic systematic review and confirmed as the current International Standard in ISO reviews (confirmation entries appear in ISO records). Users should check the ISO catalogue or national bodies for any amendments, revisions or newer editions after 2001 before assuming it is the latest authoritative text.

Q: Is it part of a series?

A: Yes — ISO 709:2001 is part of a family of ISO test methods and product standards for essential oils (many product standards reference it). Related test methods include ISO 1241, ISO 1242, ISO 592 and other ISO methods commonly cited in oil‑specific standards.

Q: What are the key keywords?

A: Essential oils; ester value; ester number; titration; test method; ISO 709; quality control; ISO/TC 54.