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Cadmium-removed rice flour and preparation method thereof

A rice flour and cadmium removal technology, which is applied in food preparation, food ultrasonic treatment, food electrical treatment, etc., can solve the problems of large environmental pollution, long reaction time of biological laws, and residual food additives, so as to avoid bacterial pollution and treat Short, easy-to-handle results

Active Publication Date: 2015-09-23
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have some problems, for example, the chemical method is easy to cause food additive residues, the biological method takes too long to react, and these two methods have a greater impact on environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add water and mix: Weigh 500g of cadmium-containing rice (cadmium content is 0.256mg / kg, water content is 13.7%), crushed through 80 mesh sieve, then add 1000mL deionized water and stir evenly, and prepare 50w / v% rice suspension;

[0025] (2) High-voltage pulse electric field treatment: The suspension obtained in step (1) was subjected to high-voltage pulse electric field treatment, the electric field strength was 20kV / cm, the pulse width was 2μs, the pulse frequency was 200Hz, and the flow rate of the suspension was 1mL / s. The time is 200 pulses, and the processing temperature is 25°C;

[0026] (3) Ultrasonic treatment: pump the suspension treated with high-voltage pulse electric field into the ultrasonic dispersion emulsifier, maintain the temperature of the suspension at 25°C, and perform ultrasonic treatment for 10 minutes at an ultrasonic frequency of 20 kHz;

[0027] (4) Centrifugation and cleaning: Centrifuge the suspension after ultrasonic treatment to remo...

Embodiment 2

[0031] (1) Mixing with water: Weigh 500g of cadmium-containing rice (cadmium content is 0.341mg / kg, moisture content is 13.5%), crushed through a 100-mesh sieve, then add 1500mL deionized water and stir evenly to prepare 33w / v% rice suspension;

[0032] (2) High-voltage pulse electric field treatment: The suspension obtained in step (1) was subjected to high-voltage pulse electric field treatment, the electric field strength was 30kV / cm, the pulse width was 3μs, the pulse frequency was 300Hz, and the flow rate of the suspension was 1.5mL / s. The processing time is 300 pulses, and the processing temperature is 30°C;

[0033] (3) Ultrasonic treatment: pump the suspension treated with high-voltage pulse electric field into the ultrasonic dispersion emulsifier, maintain the temperature of the suspension at 30°C, and perform ultrasonic treatment for 15 minutes at an ultrasonic frequency of 30kHz;

[0034] (4) Centrifugation and cleaning: Centrifuge the suspension after ultrasonic t...

Embodiment 3

[0038] (1) Mixing with water: Weigh 500g of cadmium-containing rice (cadmium content is 0.400mg / kg, moisture content is 14.1%), crushed through a 100-mesh sieve, then add 2000mL deionized water and stir evenly to prepare 25w / v% rice suspension;

[0039] (2) High-voltage pulse electric field treatment: The suspension obtained in step (1) was subjected to high-voltage pulse electric field treatment, the electric field strength was 40kV / cm, the pulse width was 4μs, the pulse frequency was 400Hz, and the flow rate of the suspension was 2mL / s. The time is 400 pulses, and the processing temperature is 35°C;

[0040] (3) Ultrasonic treatment: pump the suspension treated with high-voltage pulse electric field into the ultrasonic dispersion emulsifier, maintain the temperature of the suspension at 35°C, and perform ultrasonic treatment for 20 minutes at an ultrasonic frequency of 40kHz;

[0041](4) Centrifugation and cleaning: Centrifuge the suspension after ultrasonic treatment to re...

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Abstract

A cadmium-removed rice flour and a preparation method thereof. The preparation method the cadmium-removed rice flour is as below: (1) crushing the rice with cadmium content of 0.2-0.4mg / kg and mixing with water; (2) conducting high-voltage pulse electric field treatment; (3) conducting ultrasonic treatment; (4) centrifuging and washing; and (5) drying. The invention employs by synergistic effect of high-voltage pulse electric field and ultrasound, reaches the removal of cadmium in the cadmium-containing rice up to 75%; and the cadmium content of rice flour after removal of cadmium is less than 0.1mg / kg. The entrie treatment of the present invention only requires a short time of 25-40 min; no additive is needed; the generated waste is easy to treat; the rice flour after removal of cadmium provided by the method is safe, healthful and pollution-free, reaches recovery of no less than 92%, and can be further processed into a variety of foods. The method of the invention has the advantages of simple process, easy operation, efficiency, safety and environment-friendliness and less damage to nutrients.

Description

technical field [0001] The invention relates to a cadmium-depleted rice flour and a preparation method thereof, in particular to a cadmium-depleted rice flour under the synergistic effect of a high-voltage pulse electric field and ultrasonic waves and a preparation method thereof. Background technique [0002] Cadmium in the environment can be imported into crops through atmospheric dustfall, sewage irrigation, sludge agricultural use and agricultural fertilization, and enriched in crop grains. Compared with other crops, rice has a stronger ability to accumulate cadmium (A brief introduction to the source, hazards and detection and control methods of cadmium in food, Guangdong Chemical Industry, 2013, 40(18), p80-81). Studies have shown that the distribution of cadmium in rice is heterogeneous, and the content in each structure is significantly different. The cadmium content in the cortex and embryo is significantly higher than that in the glume and endosperm (analysis of ca...

Claims

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Application Information

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IPC IPC(8): A23L1/10A23L1/025A23L7/10A23L5/30
CPCA23V2002/00A23V2300/48A23V2300/12
Inventor 吴伟林亲录吴晓娟吴跃付湘晋梁盈徐友志
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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