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3.
Determination of the specific volume of bread
(1) Instruments
①Bread specific volume tester: The measuring range is 0～1000mL, and the shape is shown in Figure 2-12
.
②Balance: Sensitivity 0.
1g
.
(2) Measuring method
① Weigh the bread to be tested (accurate to 0.
1g)
.
②When the volume of the bread to be tested is not more than 400mL, first cover the bottom box, open the top box lid and the insert plate, and put the filling from the top box to the zero line of the scale
.
After covering the top cover, invert it several times to eliminate the dead space and adjust the filling amount to the zero line of the scale; when measuring, put the filling upside down in the top box, turn off the switch, open the bottom box cover, and put it in.
Figure 2-12 MTJ-1 Bread Specific Volume Tester
③When the volume of the bread to be tested is greater than 400mL, first open the bottom box, put in the standard module of 400mL, close the bottom box, open the top box cover and the insert plate, put the filling from the top box to the zero line of the scale, cover After finishing the top cover, invert it several times to eliminate the dead space and adjust the filling amount to the zero line of the scale; when measuring, put the filling upside down in the top box, turn off the flap switch, open the bottom box cover, and take out the standard module.
Put in the bread to be tested, cover the bottom cover, pull open the insert plate to make the filling fall naturally, and read the scale of the filling on the ruler, which is the actual measured volume of the bread
(3) Result calculation
Where v——the specific volume of bread, mL/g
V——Bread volume, mL
m——bread quality, g
The absolute difference between two independent determination results obtained under repeatability conditions should not exceed 0.
1 mL/g
(4) Tips
①GB/T20981-2007 stipulates that the specific volume index of bread is ≤7.
② A simple method for measuring the specific volume of bread
It can also be measured by a simple method when there is no bread specific volume tester, that is, take a sample of bread to be tested, weigh it (accurate to 0.
Where v——the specific volume of bread, mL/g
V 1 ——Volume of container, mL
V 2 ——Volume of filler, mL
m——bread quality, g
Related links: Determination of other physical properties of food (1)
