Method of reducing heavy metals of cereals
A heavy metal and grain technology, applied in the field of grain and grain processing by-products, can solve the problem of high cost, achieve low cost, good effect, and reliable technical process
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[0042] Example 1 Examples of processes for removing heavy metals from rice
[0043] The initial test values of the raw rice sample used for the test: starch content 78.52%, moisture content 12.23%, crude protein content 7.21%, cadmium content 0.382mg / kg, lead content 0.165mg / kg, arsenic content 0.085mg / kg, mercury content 0.013 mg / kg, nickel content 0.71mg / kg, copper content 3.592mg / kg.
[0044] Step 1: Take 1000g of the above-mentioned raw rice, wash with 1500g of tap water, and wash twice;
[0045] Step 2: Add 4000g of Soaking Solution 1 (0.4% NaOH solution) to the washed rice, stir and soak for 3 hours at room temperature to fully swell the rice, and grind the swollen rice with a colloid, over 100 Mesh screen
[0046] Step 3: Separate the slurry by sedimentation to obtain precipitate 1, adjust the pH of the supernatant to 2.0 with 0.1N hydrochloric acid, and dialyze the dialysis bag with a molecular weight cut-off of 1000D against a pH 2.0 hydrochloric acid solution for 24 hours...
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[0051] Example 2 Comparison of the removal of heavy metals from rice with different soaking solutions 1
[0052] The method in Example 1 was used to remove heavy metals from the rice, and the raw rice for the test was the same sample as in Example 1. Just change the soaking solution 1 in step 2 of Example 1, and the effect of different soaking solutions 1 in removing heavy metals from rice is shown in Table 1.
[0053] Table 1 Treatment effects of different soaking solutions 1
[0054]
[0055] Table 1 shows that when the selected soaking solution 1 is used for the corresponding heavy metal removal treatment, the heavy metal content in the obtained product meets the national standard (see the National Standard of the People's Republic of China, standard number GB 2762-2012), of which 0.4% NaOH The solution has a relatively good effect of removing heavy metals, and the protein recovery rate is also the highest.
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[0056] Example 3 Comparison of the removal of heavy metals from rice protein by different membrane separation conditions
[0057] The method in Example 1 was used to remove heavy metals from the rice, and the raw rice for the test was the same sample as in Example 1. It is just that the conditions for removing heavy metals by membrane separation of the supernatant in step 3 of Example 1 were changed. Among them, ultrafiltration concentrated the volume of the supernatant to about 35% of the original volume. The removal effect of heavy metals is shown in Table 2.
[0058] Table 2 The separation and removal of heavy metals by different membranes
[0059]
[0060] Table 2 shows that in the selected dialysis bags and ultrafiltration membranes, the product recovery rate decreases as the molecular weight cutoff increases, and the effect of heavy metal removal is not much different. The cadmium and lead heavy metal content of the obtained rice protein meets the national standards (See the N...
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