A method for preparing bamboo leaf polyphenols from bamboo leaves
A technology of bamboo leaves and zirconia is applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of high flavonoid content, limited use of products, low phenolic acid, etc. low cost effect
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Embodiment 1
[0022] 1. Preparation of zirconia
[0023] 1. Solid ZrOCl 2 ·8H 2 After O (12.89g, 0.04mol) was dissolved in 94mL of deionized water (ZrOCl 2 Concentration is 0.4mol / L), add 28%wt ammonia water dropwise, until pH=10, the obtained white suspension continues to stir at room temperature for 1 hour;
[0024] 2. The white precipitate obtained by centrifugation at 3500 rpm was washed with deionized water until pH = 7, heated in an oven at 110°C for 12 hours, and then calcined in a muffle furnace at 400°C for 2 hours to obtain white zirconia.
[0025] Second, the characterization of zirconia
[0026] 1. After the zirconia prepared in step 1 is detected by an infrared spectrometer, its infrared spectrum (KBr) is as attached figure 1 As shown, its infrared spectrum data (KBr) is: 500-850, 1200-1460, 1460-1680 (cm -1 );
[0027] 2. After the zirconia prepared in step 1 is detected by X crystal diffractometer, its XRD pattern is as attached figure 2 Shown: the zirconia prepared b...
Embodiment 2
[0043] One, the preparation of zirconia:
[0044] The difference between the preparation method of zirconia in this example and embodiment 1 is: ZrOCl 2 The concentration of the zirconia is 0.6mol / L, the calcination temperature of zirconia is 500 degrees, and the rest of the steps are the same as in Example 1.
[0045] Two, the preparation of bamboo leaf polyphenols:
[0046]1. Take 1 g of the powdered bamboo leaves that have passed through a 40-mesh sieve, add 20 mL of ethanol solution with a volume concentration of 50%, and perform ultrasonic extraction at 50W / 45kHz for 40 minutes; the extract is filtered through a 0.45 μm filter membrane to obtain a crude extract.
[0047] 2. Add the zirconia obtained in step 1 to the crude extract according to the ratio of 0.2g zirconia to 1mL crude extract, and oscillate and adsorb on a shaking table at 37°C / 150rpm for 2 hours; centrifuge at 4000rpm for 1 minute, The separated zirconia is collected.
[0048] 3. Wash the collected zirco...
Embodiment 3
[0051] One, the preparation of zirconia:
[0052] The difference between the preparation method of zirconia in this example and embodiment 1 is: ZrOCl 2 The concentration of the zirconia is 0.8mol / L, the calcination temperature of zirconia is 300 degrees, and the rest of the steps are the same as in Example 1.
[0053] Two, the preparation of bamboo leaf polyphenols:
[0054] 1. Take 1 g of the powdered bamboo leaves that have passed through a 40-mesh sieve, add 15 mL of ethanol solution with a volume concentration of 70%, and perform ultrasonic extraction at 50W / 45kHz for 50 minutes; the extract is filtered through a 0.45 μm filter membrane to obtain a crude extract.
[0055] 2. Add the zirconia obtained in Step 1 to the crude extract according to the ratio of 0.3g zirconia to 1mL crude extract. Under the condition of 37°C / 150rpm, oscillate and adsorb on a shaking table for 4 hours; centrifuge at 4000rpm for 1 minute, The separated zirconia is collected.
[0056] 3. Wash t...
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