Overview
ISO 14244:2014 is an internationally recognized standard developed by the International Organization for Standardization (ISO), specifying a precise method for determining soluble proteins in potassium hydroxide solution in oilseed meals. This standard focuses on soya meals, rapeseed meals, and sunflower pellets, providing a reliable procedure to assess protein solubility. The method involves solubilizing proteins in a potassium hydroxide (KOH) solution of defined concentration and subsequently quantifying nitrogen content using the Kjeldahl method, as detailed in ISO 5983-1 and ISO 5983-2.
This standard is essential for laboratories and industries involved in the production, quality control, and analysis of oilseed meals used as animal feed or raw materials. By applying ISO 14244:2014, organizations can ensure consistency in measuring protein quality, which directly impacts the nutritional evaluation and processing of oilseed-based products.
Key Topics
- Scope and Applicability: The method applies to determining soluble proteins in soya, rapeseed, and sunflower meals using KOH solution and Kjeldahl nitrogen analysis.
- Sample Preparation: Emphasizes proper sample grinding to a defined particle size, with degreasing required if fat content exceeds 5%, following ISO 5502 guidelines.
- Reagent Specifications: Use of analytical grade potassium hydroxide solution at 0.036 mol/l concentration, prepared from 85% w/w KOH.
- Equipment Requirements: Includes precise balances, sieves with specific mesh sizes (250 μm for soya/rapeseed, 500 μm for sunflower), centrifuges set to 800g acceleration, magnetic or mechanical stirrers, and appropriate filtration tools.
- Analytical Procedure: Involves agitation of the sample in KOH solution, centrifugation, filtration of the supernatant, and nitrogen determination through Kjeldahl digestion, distillation, and titration.
- Results Expression: Calculates soluble protein content as a percentage fraction of total protein based on nitrogen ratios obtained from the sample and the soluble fraction.
- Quality Assurance: Provides data on repeatability and reproducibility validated through extensive interlaboratory testing involving multiple matrices and labs.
- Health and Safety: Highlights safety warnings due to chemical handling risks and environmental impact, advising adherence to waste management guidelines like ASTM D4447.
Applications
ISO 14244:2014 plays a critical role in various sectors including:
- Animal Feed Industry: Ensures accurate evaluation of protein quality in oilseed meal products, which affects feed formulation and nutritional adequacy.
- Agricultural Production: Supports quality control and monitoring of protein solubility to assess processing impacts and optimize oilseed meal treatments.
- Food and Feed Laboratories: Provides standardized analytical methodology for research, certification, and regulatory compliance.
- Nutritional Studies: Assists in determining the biological value of proteins derived from oilseed meals by quantifying soluble protein content.
- Industrial Processing: Helps in monitoring processing conditions such as heat treatment that influence protein solubility and feed quality.
Adoption of ISO 14244:2014 promotes harmonized testing procedures worldwide, enabling reliable data comparison and quality assurance across regions.
Related Standards
- ISO 5983-1 & ISO 5983-2: Methodology for nitrogen determination and crude protein calculation via the Kjeldahl method.
- ISO 5500: Oilseed meals sampling guidelines to ensure sample representativeness.
- ISO 5502: Preparation of oilseed meal samples for testing.
- ISO 565: Specifications for control sieves applied in particle size determination.
- ISO 5725-1 & ISO 5725-2: Statistical methods for evaluating accuracy, repeatability, and reproducibility of measurement methods.
- ASTM D4447: Guide for the disposal and pre-treatment of laboratory chemical residues.
By implementing ISO 14244:2014, stakeholders involved with oilseed meals can achieve precise and reproducible measurement of soluble proteins in potassium hydroxide solution, supporting better quality control, nutritional assessment, and process optimization within the feed and agricultural industries. This standard ensures compliance with international best practices, enhancing product reliability and industry transparency.
