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All technical contents of this standard are compulsory.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 1353-2009 Maize.
The following technical changes have been made with respect to GB 1353-2009:
——The requirements for test weight are improved, and the equal difference is adjusted to 30 g/L;
——The limit on moldy kernel index is canceled;
——Annexes A and B in Edition 2009 are canceled;
This standard was proposed by and is under the jurisdiction of the National Food and Strategic Reserves Administration.
The previous editions of this standard are as follows:
——GB 1353-1978, GB 1353-1986, GB 1353-1999 and GB 1353-2009.
Maize
1 Scope
This standard specifies the terms and definitions, classification, requirements for quality and food safety, inspection methods and rules, labeling, and requirements for packaging, storage and transport of maize.
This standard is applicable to commercial maize for purchase, storage, transport, processing and sale.
This standard is not applicable to waxy maize, sweet maize and special varieties of maize other than those specified in clause 4 “Classification”.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 5009.3 National food safety standard - Determination of moisture in foods
GB/T 5490 Inspection of grain and oils - General rules
GB/T 5491 Inspection of grain and oilseeds - Methods for sampling and sample reduction
GB/T 5492 Inspection of grain and oils - Identification of colour, odour and taste of grain and oilseeds
GB/T 5493 Inspection of grain and oils - Determination of type purity and their mixture
GB/T 5494 Inspection of grain and oils - Determination of foreign matter and unsound kernels of grain and oilseeds
GB/T 5498 Inspection of grain and oils - Determination of test weight
LS/T 6103 Inspection of grain and oils - Determination of moisture content of grain - Waterlogged suspend method
LS/T 6117 Inspection of grain and oils - Determination of test weight - Waterlogged suspend method
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
test weight
mass of maize kernels in unit volume, which is measured with the specified method
3.2
defective kernels
maize kernels defective or damaged but still useful, including insect-damaged kernels, spotted kernels, broken kernels, sprouted kernels, moldy kernels and heat-damaged kernels
3.2.1
insect-damaged kernels
kernels decayed and with wormhole or channel formed due to insects
3.2.2
spotted kernels
kernels with disease spot on their surface and the damage goes into the embryo or endosperm
3.2.3
broken kernels
kernels of which the volume of the broken parts accounts for one-fifth or more of this kernel
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3.2.4
sprouted kernels
kernels whose sprout or radicle have broken out from the epidermis or even if not, the epidermis in the embryo area has broken or is of appreciable uplift showing signs of gemmulation
3.2.5
moldy kernels
kernels with moldy surface
3.2.6
heat-damaged kernels
kernels discoloured significantly or damaged after heating or drying, including nature heat-damaged kernels and drying heat-damaged kernels
3.2.6.1
nature heat-damaged kernels
kernels whose embryo or endosperm has discoloured significantly due to hyperventilation during storage period
3.2.6.2
drying heat-damaged kernels
kernels whose epidermis or germ or endosperm significantly discolored or which deformed or expanded as a result of heated drying
3.3
foreign matter
matters other than maize kernels, and useless maize kernels, including throughs, inorganic impurities and organic impurities
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3.3.1
throughs
materials passing through a 3.0 mm-diameter circular screen
3.3.2
inorganic impurities
inorganic substances, e.g. soil, sand, and brick blocks
3.3.3
organic impurities
organic substances, e.g. useless maize kernels, heterogeneous kernels, weed seeds
3.4
colour
overall colour and luster of a batch of maize under specific conditions
3.5
odour
normal smell and no extraneous odour of a batch of maize under specific conditions
3.6
moisture content
percentage of water mass in the sample to the total mass of maize
3.7
severely moldy kernels
kernels whose surfaces are obviously moldy, embryos or endosperms are injured, and which have no edible value
4 Classification
The maize is divided into yellow maize, white maize and mixed maize by color. The maize is classified as follows:
a) yellow maize: maize with not less than 95% of yellow or reddish coated kernels;
b) white maize: maize with not less than 95% of white or faint yellow or faint pink coated kernels;
c) mixed maize: mixed with yellow and white corn that not confirm to a) and b).
5 Requirements
5.1 Requirements for quality
See Table 1 for the requirements for quality of various maize. Where, Grade 3 is medium in the test weight grading indexes.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Inspection methods
7 Inspection rules
8 Labeling
9 Packaging, storage and transport
