GB/T 20977-2007[Including 2017XG1] General technical requirement for the pastry (English PDF)

3.1 Hot-processed Pastry

3.1.1 Baked pastry

Baked pastry is divided into. puffy pastry, soft pastry, crispy pastry, flaky pastry, meringue pastry, water-oiled crust pastry, syrup crust pastry, soft crust pastry, hard crust pastry, fermented pastry, baked pastry and bake cakes.

3.1.2 Fried pastry

Fried pastry is divided into. meringue pastry, water-oiled crust pastry, soft pastry, flaky pastry, water-conditioned pastry, fermented pastry and glutinous rice pastry.

3.1.3 Steamed pastry

Steamed pastry is divided into. steamed cakes, impression cakes, tough cakes, steamed sponge cakes and sponge cakes.

3.1.4 Cooked flour pastry

Cooked flour pastry is divided into. hot-adjusted soft cakes, impression cakes and sliced cakes.

3.1.5 Others

Cooked processed pastry other than baked pastry, fried pastry, steamed pastry and cooked flour pastry.

5.2 Inspection of Physical and Chemical Indicators

5.2.1 Inspection of loss on drying

In accordance with Method 1 of GB/T 5009.3-2003, conduct the determination.

5.2.2 Inspection of protein

In accordance with Method 1 of GB/T 5009.5-2003, conduct the determination.

5.2.3 Inspection of fat

In accordance with Method 1 of GB/T 5009.6-2003, conduct the determination.

5.2.4 Inspection of total sugar

Take Appendix A as a reference.

5.3 Inspection of Hygienic Indexes

In accordance with the method specified in GB 7099, conduct the determination.

5.4 Inspection of Aluminum

In accordance with the method specified in GB/T 5009.182, conduct the determination.

5.5 Inspection of Net Quantity

In accordance with the method specified in JJF 1070, conduct the determination.

6.1 Exit-factory Inspection / On-site Inspection

6.1.1 Products exiting factory shall be inspected batch by batch by the inspection department, and a product qualification certificate shall be issued.

6.1.2 Exit-factory inspection / on-site inspection.

6.1.2.1 Before exiting factory, the prepackaged products shall receive sampling inspection batch by batch. The exit-factory inspection items include. sensory inspection and allowable shortage of net quantity. In the sensory inspection, the inspection of appearance, color, luster and impurities needs to cover every product. This inspection shall be carried out before packaging.

6.1.2.2 Before the sales of products made on site, on-site sampling inspection shall be performed. The on-site inspection items include sensory inspection and allowable shortage of net quantity. In the sensory inspection, the inspection of appearance, color,

Appendix A (informative)

Determination of Total Sugar Content (Fehling’s volumetric method)

A.1 Principle

When Fehling solution A and B are mixed, the generated potassium sodium copper tartrate is reduced by reducing monosaccharides to form red cuprous oxide precipitate.

When reaching the end point, a slight excess of reducing monosaccharides reduces the blue methylene blue chromosome to a colorless leuco-body and manifests the bright red color of cuprous oxide.

A.2 Reagents

A.2.1 Fehling solution A. weigh-take 69.3 g of chemically pure copper sulfate; add

distilled water to dissolve it; prepare it into 1,000 mL.

A.2.2 Fehling solution B. weigh-take 346 g of chemically pure sodium potassium

tartrate and 100 g of sodium hydroxide; add distilled water to dissolve it; prepare it into

1,000 mL.

A.2.3 1% methylene blue indicator.

A.2.4 20% sodium hydroxide solution.

A.2.5 6 N hydrochloric acid.

A.2.6 Calibration of Fehling solution. on an analytical balance, accurately weigh-take

0.4 g of analytically pure glucose that has been dried and cooled; use distilled water to dissolve it and transfer to a 250 mL volumetric flask; add water to the scale; shake it well for later use.

Accurately and respectively take 2.5 mL of Fehling solution A and Fehling solution B;

place into a 150 mL conical flask; add 20 mL of distilled water; heat to boiling on an electric stove. Use the prepared glucose solution to titrate it, until the solution turns red, then, add 1 drop of the methylene blue indicator. Continue the titration, until the blue disappears and the bright red is manifested, which is the end point. In the formal titration, firstly, add glucose solution that is 0.5 mL ~ 1 mL less than in the pre-test, boil it for 2 min on the electric stove; add 1 drop of the methylene blue indicator; continue to use the glucose solution to titrate to the end point. In accordance with Formula (A.1), calculate the concentration.

Where,

A---the grams of glucose equivalent to 5 mL of Fehling solution A and B;

m---the mass of glucose, expressed in (g);

V---the volume of the glucose solution consumed in titration, expressed in (mL).

A.3 Instruments

A.3.1 Conical flask. 150 mL, 250 mL.

A.3.2 Volumetric flask. 250 mL.

A.3.3 Sugar dropper. 25 mL.

A.3.4 Beaker. 100 mL.

A.3.5 Centrifuge. 0 ~ 4,000 r/min.

A.3.6 Industrial balance. division value 0.001 g, maximum weighing 200 g.

A.3.7 Electric furnace. 300 W.

A.4 Method of Operation

On an industrial balance, accurately weigh-take 1.5 g ~ 2.5 g of sample; put it in a 100 mL beaker; use 50 mL of distilled water to soak it for 30 min (stir it for several times during soaking). Transfer it into a centrifuge test tube; use 20 mL of distilled water to rinse the beaker; transfer the washing solution together into the centrifuge test tube.

Place it on a centrifuge, at 3,000 r/min, centrifuge it for 10 min; filter the supernatant into a 250 mL conical flask through quick filter paper. Use 30 mL of distilled water to rinse the previous beaker in 2 ~ 3 times, then, transfer it into a centrifuge test tube to stir and wash the specimen residue. Then, at 3,000 r/min, centrifuge it for 10 min; filter the supernatant into a 250 mL conical flask through filter paper. After the soaking, the specimen solution can also be directly filtered with quick filter paper (add precipitant if necessary). Add 10 mL of 6 N hydrochloric acid to the filtrate; place it in 70 °C water bath to hydrolyze for 10 min. Take it out and quickly cool it down, then, add 1 drop of phenolphthalein indicator; use 20% sodium hydroxide solution to neutralize it, until the solution becomes reddish. Transfer it to a 250 mL volumetric flask; add water to the scale; shake it well for later use.

Use the method of calibrating Fehling solution A and B to determine the total sugar in the sample.

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