LY/T 1650-2005Hazelnut nut (English PDF)

5.3 Kernel rate

In the samples, randomly WEIGH about 1000g of sample nuts. WEIGH the mass of

sample nuts. Then BREAK the nutshells and TAKE the kernels one by one. And

WEIGH the mass of kernels.

Kernel rate is calculated according to equation (2), accurate to the nearest integer.

Where.

X — Kernel rate, %;

m2 — Mass of sample kernels, in units of grams (g);

m1 — Mass of sample nuts, in units of grams (g).

5.4 Impurity content

Randomly WEIGH about 1000g of samples, and WEIGH the mass of samples. Then

PUT the samples on a clean table, PICK out the fruit buds, leaves, twigs, weeds, and

other impurities mixed in the nuts and weigh.

Impurity content is calculated according to equation (3), accurate to 0.1g.

Where.

I — Impurity content, %;

m3 — Mass of impurities in samples, in units of grams (g);

m4 — Mass of samples, in units of grams (g).

Where.

E — Empty nut rate, %;

N4 — Number of empty nuts, in units of grain;

N — Number of sample nuts, in units of grain.

5.8 Moisture

Determination method is shown in Annex A.

5.9 Hygienic inspection

Determination method is implemented according to the specifications of GB/T

5009.12, GB/T 5009.17, GB/T 5009.19, GB/T 5009.11, and GB/T 5009.20.

6.1 Batch

The hazelnuts of the same-origin, same-grade, and the same batch of acquisition,

transportation, and marketing are deemed as a test batch.

6.2 Sampling

IMPLEMENT according to the specifications of 2.1, 2.2.1.4, 2.3.2, and 3.1 of GB

5491-1985.

6.3 Determination rules

6.3.1 If the products meet the requirements of Chapter 4 after test, then this batch of

products are determined as qualified products of the corresponding grades according

to this Standard.

6.3.2 If there is one item not meeting the basic requirements of 4.1 and grade

requirements of 4.3, then this batch of products is determined as unqualified

according to this Standard.

6.3.3 In special-grade nuts, the mass of first-grade nuts and second-grade nuts shall

not exceed 12% of the total mass. In first-grade nuts, the mass of second-grade nuts

shall not exceed 12% of the total mass.

6.4 Re-inspection

Annex A

(Normative)

Determination of moisture content - direct drying method

A.1 Principle

DETERMINE the moisture content by calculating the mass differences of hazelnut

nuts before and after being dried at 103°C (±2°C) in drying oven for 6h.

A.2 Appliances

A.1.1 Mortar.

A.2.2 Balance (sensitivity is 0.001g).

A.2.3 Glass or metal weighing dishes with lids.

A.2.4 Electric drying oven with ventilation, and the temperature is adjusted to 103°C

(±2°C).

A.2.5 Dryers that contain effective desiccant (i.e., calcium chloride).

A.3 Sample preparation

BREAK the nutshells of the sample hazelnuts to be tested and TAKE out the kernels.

GRIND the kernels in a mortar. If necessary, PUT the hazelnut shells that are as

samples in a porcelain mortar to grind or crush to fine particles with the particle size of

2mm~4mm.

A.4 Drying processing, weighing, and calculation

A.4.1 DRY the weighing dish and its lid in the drying oven for at least 2h, then put

them in the dryer. COOL the weighing dish and its lid to room temperature.

A.4.2 WEIGH the mass (m0) of empty weighing dish and its lid.

A.4.3 WEIGH about 50g of the test materials, and SPREAD them evenly on the

bottom surface of the weighing dish that has been dried. Then COVER the weighing

dish with the lid quickly. WEIGH the whole mass (m1). When conducting this part of

the operation, OPERATE as quickly as possible.

A.4.4 PUT open weighing dish along with the lid into a drying oven. CLOSE the door;

CONDUCT drying processing. After 6h, OPEN the door. COVER the weighing dish

with the lid quickly, and PLACE it in the dryer to cool. When cooled to the same

temperature as the surrounding environment, WEIGH the mass (m2) of the closed

dryer.

A.4.5 The percentage expression of moisture content of the sample is shown in

equation (A.1).

The results shall be accurate to the nearest integer.

A.4.6 TAKE the average value obtained by the results of four parallel sample

measurements as the test result.

A.5 Other inspection methods that are calibrated by direct drying method have the

same test effectiveness. However, the direct drying method is the arbitration method.

Moisture content of the sample (%)

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