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GB/T 21499-2024: Inspection of grain and oils - Determination of the potential milling yield from paddy and from husked rice
Status: Valid GB/T 21499: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 21499-2024 | English | 274 |
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Inspection of grain and oils - Determination of the potential milling yield from paddy and from husked rice
| Valid |
GB/T 21499-2024
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| GB/T 21499-2008 | English | 214 |
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Rice -- Determination of the potential milling yield from paddy and from husked rice
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GB/T 21499-2008
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PDF similar to GB/T 21499-2024
Basic data | Standard ID | GB/T 21499-2024 (GB/T21499-2024) | | Description (Translated English) | Inspection of grain and oils - Determination of the potential milling yield from paddy and from husked rice | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B20 | | Classification of International Standard | 67.060 | | Word Count Estimation | 14,18 | | Date of Issue | 2024-11-28 | | Date of Implementation | 2025-06-01 | | Older Standard (superseded by this standard) | GB/T 21499-2008 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 21499-2024: Inspection of grain and oils - Determination of the potential milling yield from paddy and from husked rice
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 67.060
CCSB20
National Standard of the People's Republic of China
Replace GB/T 21499-2008
Grain and oil inspection - Determination of potential yield of rice and brown rice
Released on 2024-11-28
2025-06-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 21499-2008 "Determination of potential rice yield of rice, paddy and brown rice" and is consistent with GB/T 21499-2008.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- The sampling method has been changed (see Chapter 6, Chapter 6 of the.2008 edition);
--- Changed the sample preparation method (see Chapter 7, Chapter 7 of the.2008 edition);
--- Changed the adjustment of experimental rice mill (see 8.1.2, 8.1.2 of the.2008 edition);
--- Changed the determination of brown rice rate and added the recommended minimum sample size (see 8.2, 8.2 of the.2008 edition);
--- Changed the result calculation, added the requirement of two parallel tests, and changed the calculation formula (see Chapter 9, Chapter 9 of the.2008 edition).
chapter).
This document is equivalent to ISO 6646.2011 "Determination of potential yield of rice, paddy and brown rice".
The following minimal editorial changes were made to this document.
--- To coordinate with the existing standards, the name of the document is changed to "Determination Method of Potential Rice Yield of Paddy and Brown Rice for Grain and Oil Inspection";
---Added notes in Chapter 7;
--- Added note in 8.1.2.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the State Administration of Grain and Material Reserves.
This document is under the jurisdiction of the National Technical Committee on Cereals and Oils Standardization (SAC/TC270).
This document was drafted by. Standard Quality Center of the State Administration of Grain and Material Reserves, Anhui Grain and Oil Product Quality Supervision and Inspection Station, Jiangsu Province
Grain and Oil Quality Monitoring Center, Liaoning Province Grain and Material Reserve Affairs Service Center, Heilongjiang Province Grain Quality and Safety Monitoring and Technology Center,
Guoliang Wuhan Scientific Research and Design Institute Co., Ltd., Tibet Autonomous Region Grain Bureau Grain and Oil Center Laboratory, Hefei Customs Technology Center, Guizhou Provincial Grain Bureau
Oil product quality supervision and inspection station.
The main drafters of this document are. Xu Guangchao, Hu Bin, Ji Yishun, Yuan Qiang, Guo Yuting, Mao Yongrong, Jia Xueying, Zhang Lili, Ding Yunjie, Chen Jianwei,
Min Guochun, Ji Lanyang, Yuan Yi, Zhou Chengyin, Zhou Junmei, Zhang Chaofu, Wang Xinwen, Wu Yun, Han Yuhui, Xu Chunfeng, Luo Yan, and Fan Yifan.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2008 as GB/T 21499-2008;
---This is the first revision.
Grain and oil inspection - Determination of potential yield of rice and brown rice
1 Scope
This document defines the terms and definitions for the determination of potential rice yield of paddy and brown rice, and describes the principles, instruments and utensils of the determination method,
Sample preparation, measurement steps, result calculation, precision and test report.
This document is applicable to the laboratory using rice milling equipment to measure the brown rice rate of paddy or parboiled rice and the whole rice, parboiled rice or brown rice, parboiled brown rice
Determination of polished rice rate.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
ISO 7301 Rice Specification
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in ISO 7301 and the following apply.
3.1
Brown rice rate huskedrice
The mass fraction of brown rice in the clean rice sample after husking.
3.2
Miledriceyield
The clean rice sample was husked by a rice husker to become brown rice. The brown rice was milled by an experimental rice mill (whole grains, broken grains and finely broken grains) to account for 1.3% of the sample.
quality score.
3.3
Miled head rice rate
The clean rice sample is husked into brown rice by a rice husker, and the mass fraction of the whole polished rice after the brown rice is milled by an experimental rice mill accounts for the mass fraction of the sample.
3.4
Perfect kernel
Except for unripe and deformed grains, there are no broken brown rice grains or polished rice grains.
4 Principle
The clean rice sample was husked by a rice husker to obtain brown rice, which was weighed. The brown rice was milled with an experimental rice mill to remove a certain amount of cortex and germ, and the weight was measured.
Take the mass of rice and whole polished rice, and calculate the mass fraction of brown rice, rice and whole polished rice in the rice sample.
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