SIST EN ISO 20483:2014 PDF

Name: SIST EN ISO 20483:2014 — Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013)
SKU: SIST EN ISO 20483:2014
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Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013)

Название (английский):

SIST EN ISO 20483:2014

Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 20
Дата публикации:: 13 января 2014 г.
ICS:: 67.060
Технический комитет:: KŽP - Agricultural food products

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Описание (английский):

ISO 20483:2013 specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content. The method does not distinguish between protein nitrogen and non-protein nitrogen.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 20483:2013 - equivalently ISO 20483:2013 - defines the Kjeldahl method for determination of nitrogen content and calculation of crude protein in cereals, pulses and derived products. Published by CEN/ISO, the standard specifies sample preparation, reagents, apparatus, test procedure (digestion, distillation and titration), expression of results and precision criteria. It notes that the method does not distinguish protein nitrogen from non‑protein nitrogen and that full recovery of nitrates/nitrites may not always be possible.

Key topics and technical requirements

Scope and principle

Applicable to cereals, pulses and derived products.
Principle: acid digestion (sulfuric acid + catalyst), alkalization, steam distillation, ammonia capture in boric acid and titration to quantify nitrogen, then conversion to crude protein.

Reagents and materials

Specified reagents include concentrated sulfuric acid (c ≈ 18 mol·L−1), Kjeldahl catalyst tablets (CuSO4/TiO2/K2SO4 mix), boric acid trapping solution, indicators (bromocresol green/methyl red), and standardized titrants (e.g. H2SO4 0.05 mol·L−1).

Apparatus and procedure

Requirements for digestion and distillation apparatus, anti‑foaming measures, blank determinations and reference/material check tests.

Sampling and sample preparation

Directions for sampling representative test portions and determining moisture content prior to protein calculation (see normative moisture methods).

Results and quality criteria

Expression of nitrogen and crude protein as mass fraction (percentage of dry product).
Annexes provide interlaboratory test results, repeatability/reproducibility limits and critical difference guidance.

Conversion

Annex C lists factors for converting nitrogen to protein appropriate to different cereals/pulses.

Safety

Standard includes a safety warning: users must apply appropriate laboratory safety and regulatory practices when handling hazardous reagents and operations.

Applications and users

Routine and official laboratory analysis for:

Grain, flour and pulse quality control (milling, processing).
Trade and specification verification for cereal and legume shipments.
Food industry R&D and formulation (protein labelling and nutritional analysis).
Regulatory and inspection labs requiring standardized protein determination.

Typical users: analytical chemists, food technologists, grain traders, quality assurance teams and accreditation bodies.

Related standards

ISO 712 - moisture content (reference method)

ISO 6540 - maize moisture (milled/whole grains)

ISO 24557 - pulses moisture (air‑oven method)

EN ISO 20483:2013 is the authoritative reference when using the Kjeldahl method for cereals and pulses and should be used alongside the listed moisture standards and applicable laboratory QA procedures.

SIST EN ISO 20483:2014 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 20483:2013

Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kje…

SIST EN ISO 712-2:2024

Cereals and cereal products - Determination of moisture content - Part 2: Automatic drying oven method (ISO 7…

SIST EN ISO 6540:2021

Maize - Determination of moisture content (on milled grains and on whole grains) (ISO 6540:2021)

BS ISO 24557:2009

Pulses. Determination of moisture content. Air-oven method