ISO/TS 23647:2010 PDF

Name: ISO/TS 23647:2010 — Vegetable fats and oils — Determination of wax content by gas chromatography
SKU: ISO/TS 23647:2010
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Vegetable fats and oils — Determination of wax content by gas chromatography

Название (английский):

ISO/TS 23647:2010

Vegetable fats and oils — Determination of wax content by gas chromatography

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 16
Дата публикации:: 23 сентября 2010 г.
Издание:: ISO TS 23647 edition 1 version 1
ICS:: 67.200.10

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Описание (английский):

ISO/TR 23647:2010 specifies a gas chromatographic method for determining the wax content of crude, degummed, neutralized, winterized, and fully refined vegetable oils, such as sunflower, soybean, rapeseed, corn, and rice bran oils. Waxes are esters of long chain fatty acids and fatty alcohols (having C20 or longer saturated carbon chain). The wax content is expressed in milligrams per kilogram of oil.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO/TS 23647:2010 specifies a validated gas chromatography (GC) method for the determination of wax content in vegetable fats and oils. The method applies to crude, degummed, neutralized, winterized and fully refined oils (for example sunflower, soybean, rapeseed, corn and rice bran oils) but is not applicable to olive oils or olive‑pomace oils. Waxes-defined as esters of long‑chain fatty acids and fatty alcohols with saturated chains of C20 or longer-are quantified and reported as milligrams per kilogram (mg/kg) of oil.

Key topics and technical requirements

Sample preparation: laboratory sample heating (up to 130 °C) and preparation per ISO 661 to melt crystallized waxes and remove moisture.

Separation principle: column chromatography using a mixed packing of silica gel and AgNO3‑impregnated silica gel (5 % AgNO3) to isolate waxes from triacylglycerols and other non‑glyceridic components.

Solvent systems and flow rates:

Solvent A: n‑hexane (95 %) / dichloromethane (5 %) for sample loading and washing.
Solvent B: n‑hexane (80 %) / dichloromethane (20 %) for elution (190 ml recommended).
Typical column flow rates: 1.5–2.0 ml/min for loading and ~3 ml/min for elution.

Concentration and cleanup: evaporative concentration of eluate and re‑dissolution in chloroform prior to GC.

GC determination:

Recommended column: fused silica capillary (25 m × 0.20 mm, 0.11 µm dimethylpolysiloxane).
Oven program: 170 °C (0.1 min), ramp to 350 °C at 6 °C/min, hold 20 min.
Carrier gas: H2; injector ~355 °C (split 1:30); FID ~360 °C.
Internal standard: hexatriacontane and use of stearyl stearate for response factor determination.

Quality features: precision data from interlaboratory tests, test reporting requirements and chromatogram examples (Annexes A–C).

Applications and practical value

Quality control in edible oil refining: measure residual wax after dewaxing/winterization to assess process efficiency and product clarity.

Industrial process monitoring: optimize dewaxing operations for sunflower, rice bran, corn and seed oils.

Analytical laboratories and contract testing: standardized GC protocol for consistent wax quantification (mg/kg).

Research and product development: characterize minor components and wax composition in vegetable oils.

Helps predict and prevent cold‑temperature cloudiness or crystallization in finished oils and oils intended for cold climates.

Related standards

ISO 661 - Preparation of test sample (referenced for sample prep)

ISO 5555 - Recommended sampling of edible fats and oils (sampling guidance)

Keywords: ISO/TS 23647:2010, wax content, gas chromatography, vegetable oils, wax determination, dewaxing, GC method, sunflower oil, hexatriacontane, AgNO3 silica gel.

ISO/TS 23647:2010 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and practical value

Who should use this standard

Related standards

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