GB/T 7416-2008Malting barley (English PDF)

3.1 Malting barley

2-row barley and multi-row barley, suitable for malting and beer brewing, which have been approved by certain procedures.

3.2 2-row barley

The ears of 2-row barley are flat, with only two symmetrical rows of kernels along the spike-stalk.

3.3 Multi-row barley

4-row and 6-row barley are collectively called multi-row barley.

3.3.1 4-row barley

4-row barley has two pairs of interlaced kernels, and the cross-section of the ear is quadrangular.

5.1 Sensory requirements

Sensory requirements shall be in accordance with Table 1.

5.2 Physical and chemical requirements

5.2.1 2-row barley

5.2.2 Multi-row barley

Multi-row barley shall meet the requirements in Table 3.

5.3 Hygienic requirements

Follow GB 2715 and related standards.

6.1 Appearance

Observe the color of barley in a place with bright natural light; hold the barley sample in hand for 5 minutes; smell its odor; observe the color; record whether there are luster, spotted kernels (specified by quarantine objects), moldy kernels, musty smell or other odors, etc.

6.3 Damage rate

Weigh 200 g of the sample (accurate to 0.1 g); sort out broken grains and half-grains; weigh the mass on a balance (sensitivity 0.1 g); calculate its percentage. Express results obtained to one decimal place.

6.4 Water content

6.4.4 Result calculation

Calculate the water content of the sample according to Formula (1), and express the value in %.

6.5 Thousand kernels weight

6.5.1 Apparatus

6.5.2 Analysis steps

Randomly count 1 000 barley grains directly from the barley samples from which foreign materials have been picked out, and weigh the mass on the balance. Do at least two parallel tests.

6.5.3 Result calculation

Calculate the thousand kernels weight according to Formula (2), and express the value in grams.

6.6.1 Petri dish method

6.6.1.1 Apparatus

6.6.1.2 Analysis steps

Put two medium-speed filter papers with a diameter of 9 cm into the bottom of the petri dish; add 4 mL of water to evenly wet the filter papers. Take 100 samples and put them on the filter paper, so that the abdomen of each kernel is in good contact with the filter paper; cover the petri dish; seal it with a film to prevent water from evaporating, or put the petri dish into a constant temperature and humidity incubator. At a temperature of 18 °C ~ 20 °C, germinate in a dark place.

6.7 Protein

6.7.1 Principle

Under the action of a catalyst, use sulfuric acid to decompose the sample, so that the nitrogen in the organic compound is converted into ammonia, and the distilled ammonia is absorbed by the boric acid solution; determine the nitrogen content by the acid-base titration method.

6.7.2 Reagents and solutions

6.7.2.7 Bromocresol green indicator solution (1 g/L). prepared according to GB/T 603.

6.7.2.9 Bromocresol green mixed indicator solution. Pipette bromocresol green ethanol solution and methyl red ethanol solution in a ratio of 10+4, and mix them evenly.

6.7.2.8 Methyl red indicator solution (1g/L). prepared according to GB/T 603

6.7.3 Apparatus

6.7.4 Analysis steps

Use the complete set of instruments for sample determination according to the instruction manual. Operate the self-assembled instrument as follows. […]

6.7.4.1 Preparation of fine-powder test pieces

Same as 6.4.3.1.

6.7.4.4 Sample titration

Use hydrochloric acid standard titration solution to titrate the distillate, and the color changes from green to gray, which is the end point. Record the number of milliliters of hydrochloric acid standard titration solution consumed.

Carry out a blank test at the same time as above.

6.7.5 Result calculation

Calculate the protein of the test pieces according to Formula (7), and express the value in %.

6.8 Plump grains and thin grains

6.8.1 Principle

The barley sample is sieved by kernel size in a vibrating three-layer sieve deck with different hole sizes.

6.8.2 Apparatus

6.8.2.1 Balance. sensitivity 0.1 g.

6.8.2.2 Separator. Driven by the motor through the crankshaft, it is equipped with 3 layers of sieve plates with a vertical distance of 12 mm ~ 25 mm, and has a cover and a chassis. The total height of the whole machine is 80 mm ~ 100 mm.

6.8.3 Analysis steps

Weigh 100 g (accurate to 0.1 g) of the test pieces; put them into the upper layer of the separator; cover it; turn on the motor; oscillate accurately for 5 minutes. Weigh the kernels above 2.5 mm and express it as a percentage.

7.1 Batch

Products of the same place of origin, same variety, same harvest time, same grade, same goods allocation, and same vehicle and vessel (cabin) are considered as one batch.

7.2 Sampling size

7.2.2 After taking the specimens according to Table 4, take 500 g of samples from each specimen; mix all the samples taken evenly; divide them into two parts by diagonal quartering; seal one part for future reference, and use the other part for sensory and physical and chemical analysis.

7.3 Acceptance inspection

7.3.1 During acceptance, the corresponding quality inspection department is […]

7.4 Determination rules

7.4.1 Take specimens according to Table 4, and check the packaging and net content first. Where the inspection result reaches the rejection number, judge the whole batch of products as unqualified.

7.4.2 Among the physical and chemical indicators, water content and 5-day germination rate are the main indicators of the quality grade. When other indicators are of the same grade, but one of the indicators of water content or 5-day germination rate is not of this grade, the grade of this indicator shall prevail.

8.1 Marking

8.1.1 When the malting barley is transported to the grain depot or a specified place, the place of origin, variety name, harvest time, purchase date, category and grade shall be marked.

8.2 Packaging

8.2.1 No matter which kind of packaging is used; different varieties and different origins must not be mixed into the warehouse.

8.2.2 Malting barley can be packed in bulk and put into silos or grain stacks.

8.2.3 Malting barley can also be packed in sacks or woven bags for storage.

8.3 Transportation

When transporting malting barley, the carriages or other means of transport shall be kept clean, dry and free from foreign odors and pollutants. […]

8.4 Storage