ISO 6492:1999
Animal feeding stuffs — Determination of fat content
Animal feeding stuffs — Determination of fat content
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 9
- Дата публикации:
- 19 августа 1999 г.
- Издание:
- ISO IS 6492 edition 1 version 1
- ICS:
- 65.120
This International Standard specifies a method for the determination of the fat content of animal feeding stuffs. The method is applicable to animal feeding stuffs except oilseeds and oilseed residues. For the purposes of this method, the following two categories of animal feeding stuffs are distinguished. Samples of products in category B need a hydrolysis step prior to extraction. Category B: straight feeds of animal origin including milk products; straight feeds of vegetable origin from which fats cannot be extracted without prior hydrolysis; in particular: gluten, yeast, soya and potato proteins, and heat-treated feeds; compound feeds containing the preceding products in such quantities that at least 20 % of the fat content stems from these products. Category A: animal feeding stuffs not mentioned under category B. NOTE For oilseed residues, a method for the determination of the "oil content" by hexane extraction is specified in ISO 734-1 [2], whereas a method for the determination of the "oil content" by diethyl ether extraction is specified in ISO 736 [3]. For oilseeds, a method for the determination of the "oil content" by hexane extraction is specified in ISO 659 [1].
Abstract
Overview
ISO 6492:1999 specifies a laboratory method for determining fat content in animal feeding stuffs (excluding oilseeds and oilseed residues). The standard describes sample classification, required reagents and apparatus, step-by-step extraction procedures, and calculation and reporting rules. It distinguishes two sample categories-Category A (no hydrolysis) and Category B (requires acid hydrolysis)-and provides precision data (repeatability and reproducibility) from interlaboratory tests.
Key topics and technical requirements
- Scope and categories
- Applicable to most animal feeding stuffs except oilseeds and oilseed residues.
- Category B: straight animal-origin feeds (including milk), certain vegetable feeds that require hydrolysis (gluten, yeast, soya, potato proteins, heat‑treated feeds), and compound feeds where ≥20% of fat originates from these products.
- Category A: feeding stuffs not in Category B.
- Principle
- Extraction of fat with light petroleum (boiling range 40–60 °C) or equivalent (technical hexane), with a hydrolysis step (HCl 3 mol/L) for Category B.
- Preliminary light‑petroleum extraction recommended for samples with high fat content (≥200 g/kg).
- Apparatus & reagents
- Soxhlet‑type extractor (≈100 ml syphoning volume), extraction thimbles, drying oven (103 °C), vacuum oven (80 °C,
Технические детали
- Технический комитет
- ISO/TC 34/SC 10 - Animal feeding stuffs
- SKU
- ISO 6492:1999
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