Regional Economic Cooperation and Integration in Asia

Technical Inputs

National Standard of Peoples Republic of China GB 5490~5539-85

Inspection of grain and oilseeds

Methods for determination of yellow-colored rice and cracked kernels

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As at

September 2014

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Text

Shenzhen Institute of Standards and Technology (SIST), Shenzhen, PR China

The findings and conclusions expressed in this documentation are entirely those of the authors. They do not necessarily repre-

sent the view of the Deutsche Gesellschaft fr Internationale Zusammenarbeit (GIZ) or further organising parties. The informa-

tion provided is without warranty of any kind.

On behalf of the German Federal Ministry for Economic Cooperation and Development (BMZ)

UDC (633.1 + 633.85 + 664.33).001.4

National Standard of Peoples Repuli of China GB 5490~5539-85

GB 5519 and GB 5521 are annulled

Inspection of grain and oilseeds

Methods for determination of yellow-colored rice and cracked kernels

Issue Date: November 2, 1985 Implementation Date: July 1, 1986

Issued by National Bureau of Standards of the People's Republic of China

(Standardization Administration of the Peoples Repuli of China SAC at present)

This standard applies to inspection of commercial rice, yellow-colored rice and

cracked brown rice.

The standard is proposed by the Ministry of Commerce of the People's Republic of

China.

The standards drafted by the Department of Commerce Bureau of Grain Storage and

Transportation.

The main drafters are Xiuwu Gao, Haoran Yang, Yanxia Wu, Guifen Lv.

1. Inspection of yellow-colored rice in paddy

1.1 Apparatus and Tools

1.1.1 Scale: accurate to 0.01 g;

1.1.2 Laboratory rice polisher;

1.1.3 Analytical scale, tweezers, etc.

1.2 Procedure

After husked rice yield of grain is detected, mill the husked rice in a laboratory rice

polisher into Grade 2 rice with its processed degree similar to the indicator

requirement specified in relevant standard. Weigh (W) the husked rice as test sample

after removing the husk powder. Sort out the yellow-colored rice according to

relevant requirement and weigh (W1).

1.3 Calculation of Result

Calculate the percentage of yellow-colored rice in paddy according to formula (1) : yellow coloured rice % = 1 Where:

W1 is the weight of the yellow-colored rice, in the unit of gram. W is the weight of the sample, in the unit of gram.

The acceptable difference of two testing results is no more than 0.3%. Average two

results as the final inspection result. The figure of the final result is rounded to the

first decimal place.

2 Inspection of yellow-colored rice in rice

2.1 Procedure

Weigh 50 g rice as test sample or sort out the yellow-colored rice during inspection

of broken rice, weigh as W1

2.2 Calculation and Result

Calculate the percentage of yellow-colored rice in rice according to formula (2): yellow coloured rice % = 1

Where:

W1 is the weight of the yellow-colored rice, in the unit of gram. W is the weight of the sample, in the unit of gram.

The acceptable difference of two testing results is no more than 0.3%. Average two

results as the final inspection result. The figure of the final result is rounded to the

first decimal place.

3 Inspection of cracked kernels

Husked rice with crack named cracked kernel or crackle rice.

Procedure: After husked rice yield of grain is detected, sort out 100 rice kernels

randomly, pick out rice with crack with magnifier. Calculate the percentage of cracked

kernels based on the number of rice with crack in 100 rice kernels identified.

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