Method for extracting L-tyrosine from plant protein hydrolysate
A plant protein and tyrosine technology, applied in the field of amino acid extraction, can solve the problems of miscellaneous sources of raw materials, complex process, complex production process, etc., achieve significant economic and social benefits, cheap and easy to obtain, and improve economic benefits Effect
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Embodiment 1
[0018] A method for extracting L-tyrosine from vegetable protein hydrolyzate, carried out as follows:
[0019] 1) Take 180g of vegetable protein corn yellow powder (content ≥ 45%), add 540ml of 10% hydrochloric acid, raise the temperature to 90°C in a water bath, and perform constant temperature hydrolysis reaction at this temperature for 15 hours, during which nitrogen protection is continuously introduced, and sodium metabisulfite is added . After the reaction is completed, at 70°C, concentrate and reclaim the acid in vacuo, control the vacuum to be 0.098MPa, until the mixed volume of the hydrolyzate is about 150ml, add 30% liquid alkali to adjust the pH value of the solution, and cool while adding liquid alkali, so that the temperature is always at 40°C, pH value is 0.5, after the addition, a large amount of sodium chloride crystallizes, and the salt produced is filtered at this temperature, the filtrate is slightly concentrated to about 1 / 4, cooled to 20°C, a large amount ...
Embodiment 2
[0028] A method for extracting L-tyrosine from vegetable protein hydrolyzate, comprising the steps of:
[0029] 1) Hydrolyze the raw cottonseed containing vegetable protein with hydrochloric acid, and after extracting L-leucine, store it for later use as the mother liquor for extracting L-tyrosine;
[0030] 2) Add liquid caustic soda to the mother liquor, control the pH value to 5.0, and centrifuge after standing to obtain crude L-tyrosine;
[0031] 3) Place the L-tyrosine crude product in a reaction kettle, add water 12 times the weight of the L-tyrosine crude product, and add hydrochloric acid to dissolve the L-tyrosine;
[0032] 4) Add 2% activated clay by weight of the solution in step 3) as an adsorbent, and stir evenly to make the adsorbent fully absorb impurities and grease, then filter out the adsorbent;
[0033] 5) Add liquid caustic soda to the solution, control the pH value to 5.0, centrifuge after standing still, and dry to obtain L-tyrosine.
[0034] The product...
Embodiment 3
[0036] A method for extracting L-tyrosine from vegetable protein hydrolyzate, comprising the steps of:
[0037] 1) Hydrolyze the bean curd containing vegetable protein with hydrochloric acid, and extract L-leucine, store it for later use, and use it as L-tyrosine extraction mother liquor;
[0038] 2) Add liquid caustic soda to the mother liquor, control the pH value to 3-4, and centrifuge after standing to obtain crude L-tyrosine;
[0039] 3) Place the L-tyrosine crude product in a reaction kettle, add water 9 times the weight of the L-tyrosine crude product, and add hydrochloric acid to dissolve the L-tyrosine;
[0040] 4) Add 1% of the adsorbent by weight of the solution in step 3), and stir evenly to make the adsorbent fully absorb impurities and grease, then filter out the adsorbent; the adsorbent is activated carbon and activated clay in any proportion;
[0041] 5) Add liquid caustic soda to the solution, control the pH value to 2.5-5.0, centrifuge after standing, and dr...
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