ISO 17932-2011 PDF

Full title and description

ISO 17932:2011 — Palm oil — Determination of the deterioration of bleachability index (DOBI) and carotene content. This International Standard specifies a spectrophotometric method for measuring DOBI (an indicator of ease of bleaching/refinability) and the carotene (β‑carotene) content of crude or bleached palm oil and their fractions.

Abstract

ISO 17932:2011 defines sample preparation, instrumentation and measurement procedures (UV‑VIS spectrophotometry), calculation methods (DOBI expressed as the ratio of absorbances at 446 nm and 269 nm) and reporting requirements for DOBI and carotene in palm oil. The standard includes precision information, recommended solvents (isooctane) and quality checks for spectrophotometers.

General information

• Status: Published (second edition, confirmed in ISO review process).
• Publication date: 2011-09 (second edition, 2011).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 67.200.10 (Fats and oils).
• Edition / version: 2 (ISO 17932:2011) — replaces ISO 17932:2005 (technical revision).
• Number of pages: 8 pages (English edition).

Scope

Specifies a method for determining the deterioration of the bleachability index (DOBI) of crude palm oil and the carotene content of crude or bleached palm oil and their fractions by spectrophotometric examination in the UV–VIS range. The procedure covers sample melting/homogenization, dissolution in isooctane, instrument verification and the measurement wavelengths used to calculate DOBI and carotene content.

Key topics and requirements

• Principle: measure absorbance of oil solution at 446 nm and 269 nm; DOBI = A446 / A269 (ratio reported to one decimal place).
• Carotene determination: use absorbance at 446 nm, pathlength and concentration to calculate carotene (reported as mg/kg).
• Sample preparation: melt and homogenize samples, dissolve a weighed portion in isooctane (solvent quality limits specified).
• Instrumentation and quality control: UV–VIS spectrometer with matched quartz cells (10 mm); wavelength and absorbance scales to be checked (holmium oxide filter, absorbance standards).
• Precision and validation: repeatability/reproducibility and precision information provided (interlaboratory study results and annexes).
• Reporting: results for DOBI and carotene with units, method references and any deviations from the procedure.

Typical use and users

Used by quality control and analytical laboratories, palm oil refiners and processors, traders and suppliers for lot acceptance and specification compliance, regulatory bodies, certification schemes and research institutions monitoring refineability and carotene (colour/nutritional content) in palm oil. The method supports process control, purchasing specifications and product grading.

Related standards

Related laboratory and oil‑testing standards and guides commonly referenced with ISO 17932: ISO/IEC 17025 (laboratory competence), ISO Guide 34 (reference materials), ISO 5725 (precision of measurement methods), and other ISO methods for sampling and equipment (examples: ISO 661, ISO 1042). The 2011 edition replaces ISO 17932:2005.

Keywords

palm oil; DOBI; bleachability index; carotene; β‑carotene; spectrophotometry; UV‑VIS; isooctane; oil refining; absorbance ratio.

FAQ

Q: What is this standard?

A: An ISO method (ISO 17932:2011) that specifies how to determine the deterioration of the bleachability index (DOBI) and the carotene content of palm oil using UV‑VIS spectrophotometry.

Q: What does it cover?

A: Sample preparation, solvent and reagent requirements, spectrophotometer verification, measurement at 269 nm and 446 nm, calculations (DOBI = A446/A269) and reporting, plus precision/validation details.

Q: Who typically uses it?

A: Analytical and quality laboratories, palm oil refiners and processors, traders and regulatory/certification bodies concerned with oil refineability and carotene content.

Q: Is it current or superseded?

A: ISO 17932:2011 is the second edition (2011). The 2011 edition replaces the 2005 edition and the record shows the document was reviewed and confirmed in ISO’s periodic review (confirmed status). Users should check ISO or their national body for any later amendments or confirmations.

Q: Is it part of a series?

A: It is a standalone ISO method focused on DOBI and carotene for palm oil but is used together with general laboratory and oil‑testing standards (e.g., ISO/IEC 17025, ISO Guide 34, ISO 5725 and other sampling/handling standards).

Q: What are the key keywords?

A: DOBI, bleachability index, carotene, β‑carotene, palm oil, spectrophotometry, isooctane, absorbance, A446, A269.