Rapid determination method for insoluble solid content in fruit and vegetable juice
A technology for rapid determination of solid content, applied in the direction of chemical analysis by precipitation, can solve problems such as the inability to meet the requirements of instant detection, and achieve the effects of short detection time, simple operation method, and favorable market promotion.
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Embodiment 1
[0024] (1) Determination of working separation factor of centrifuge:
[0025] The separation factor is determined by the following formula:
[0026] Kc = Rω 2 / g
[0027] R—the radius of rotation of the centrifuge tube, unit: meter, refers to the average value of the distance between the nearest end and the farthest end of the centrifuge tube when the centrifuge tube is in working condition, such as figure 1 As shown, what is shown in the figure is the working state of the centrifuge tube. In this embodiment, the rotating shaft 1 drives the centrifuge tube 2 to rotate at a speed of 3000 rpm. When the centrifuge tube 2 is working, it is perpendicular to the rotating shaft 1. The most recent end is A, and the farthest end is B, and the most recent section of present embodiment: A=0.075 meter, the farthest end: B=0.145 meter, average value: R==0.110 meter;
[0028] ω—angular velocity, unit: rad, ω=2лS / 60, S—centrifuge speed, unit: rev / min; in this embodiment, the centrifuge ...
Embodiment 2
[0033] (1) Determination of working separation factor of the centrifuge: same as Example 1;
[0034] (2) Determination of the content of insoluble solids in fruit and vegetable juices: Use a 10ml graduated straw to absorb 10ml of fruit juice or pulp into two 10.0ml centrifuge tubes with a minimum scale of 0.1ml, symmetrically Put it into an automatic balancing centrifuge, close the lid, adjust the speed to 3000 rpm, and centrifuge for 10 minutes. The centripetal acceleration parameter of the centrifuge is 1000g. Read the average of the volume readings of the solids in the two centrifuge tubes, which is the solids content.
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