Overview
SIST ISO 6866:1995 specifies a standardized method for the determination of both free and total gossypol content in animal feeding stuffs, particularly those derived from cottonseed, such as cottonseed meals and cakes. Gossypol, a naturally occurring polyphenolic compound found in cotton plants, can have toxic effects on animals if present in high concentrations. The accurate measurement of gossypol levels is essential for ensuring the safety and quality of animal feeds. This standard supports feed manufacturers, laboratories, and regulatory agencies in maintaining animal health and complying with food safety regulations.
Key Topics
- Scope of Application:
- Applicable to cottonseed, cottonseed meal, cottonseed cakes, and compound animal feeds containing these ingredients.
- Analytical Approach:
- Extraction of gossypol in the presence of 3-aminopropane-1-ol.
- Different extraction solvents for free (2-propanol/hexane mixture) and total (dimethylformamide) gossypol.
- Conversion of extracted gossypol to gossypol-dianiline through aniline reaction.
- Spectrophotometric measurement at maximum absorbance wavelength (435-445 nm) for quantification.
- Detection Limit:
- Free gossypol: 20 mg/kg
- Total gossypol: 50 mg/kg
- Sample Preparation:
- Detailed procedures for preparing and handling test samples and reagents.
- Requirements for blank and reference solutions to ensure measurement accuracy.
- Result Calculation and Reporting:
- Standardized formula for calculating gossypol content.
- Criteria for repeatability and consistency between tests.
- Comprehensive reporting requirements for laboratory testing.
Applications
- Feed Safety Control:
- Ensures that animal feeds derived from cottonseed products do not contain unsafe levels of gossypol, helping protect livestock against toxicity.
- Regulatory Compliance:
- Assists animal feed producers, suppliers, and control agencies in meeting national and international food safety standards.
- Used for mandatory or voluntary certification, auditing, and quality assurance processes.
- Analytical Laboratories:
- Provides a reliable, repeatable method for laboratories testing raw materials and finished animal feed products.
- Research and Development:
- Supports R&D in animal nutrition and toxicology by providing a reference method for assessing the effects of gossypol in feed trials.
Related Standards
- ISO 6497: Animal feeding stuffs - Sampling
- Describes the procedures for sampling animal feeds to ensure that tested samples are representative and reliable.
- ISO 6498: Animal feeding stuffs - Preparation of test samples
- Covers the preparatory steps required to ensure feed samples are ready for chemical analysis.
- Other Standards:
- Additional ISO standards related to animal feed safety, chemical analysis, and quality control may complement the use of SIST ISO 6866:1995.
Practical Value
SIST ISO 6866:1995 serves as a critical tool for the animal feed industry in the reliable determination of gossypol levels, directly impacting animal health and food safety. By utilizing this standard, stakeholders can ensure product quality, meet regulatory demands, and maintain their reputation in international markets. Accurate gossypol analysis supports both commercial and governmental efforts to monitor and control potentially harmful contaminants in the animal feed supply chain.