Method for preparing L-tertiary leucine
A technology of tert-leucine and leucine dehydrogenase, which is applied in the field of high-efficiency preparation of L-tert-leucine with single optical purity, can solve the problems of serious environmental pollution, harsh reaction conditions, and complicated reaction process, and achieve high Effects of economic value, low cost, and cost reduction of coenzymes
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[0036] Example one
[0037] In a 10 mL reaction system, add the substrates trimethylpyruvate, ammonium formate, ammonium formate-ammonia buffer, NAD in sequence + , Leucine dehydrogenase, formate dehydrogenase, the reaction system contains: substrate trimethylpyruvate 1.0M (130g / L), ammonium formate 1.0M (63g / L), 0.1 M (pH 8.0) Ammonium formate-ammonia buffer, NAD + 0.01mM (0.007 g / L), leucine dehydrogenase 2.0 U / mL, formate dehydrogenase 2.0 U / mL, maintain the pH with ammonia and hydrochloric acid, agitate the reaction at room temperature (25°C) for 3 hours, and after the reaction, Heat to 80°C for 30 minutes to fully denature the protein in the reaction solution, centrifuge for 15 minutes to remove the denatured protein, remove the solvent, and filter to obtain the L-tert-leucine product.
[0038] The conversion rate of the substrate was analyzed by high performance liquid chromatography. The results showed that the substrate was completely converted into the product L-tert-leu...
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[0040] Example two
[0041] A 10 mL reaction system was prepared, the reaction system including: substrate trimethylpyruvate 2.0M (260 g / L), ammonium formate 3.0M (189g / L), 0.1 M (pH 8.5) ammonium chloride-ammonia Buffer, NAD + 0.04mM (0.03 g / L), leucine dehydrogenase 3.0 U / mL, formate dehydrogenase 4.6 U / mL, shaking at room temperature for 24 hours. Other operations are the same as in Example 1 to obtain the white product L-tert-leucine, and the substrate conversion is complete.
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[0042] Example three
[0043] A 100 mL reaction system was prepared, the reaction system including: substrate trimethylpyruvate 1.5M (195 g / L), ammonium formate 3.0M (189g / L), 0.1 M (pH 8.5) Tris-HCl buffer , NAD + 0.1mM (0.07 g / L), leucine dehydrogenase 3.0 U / mL, formate dehydrogenase 4.6 U / mL, shaking at room temperature for 24 hours. Other operations are the same as in Example 1 to obtain the white product L-tert-leucine, and the substrate conversion is complete.
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