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20.44 g of lauric acid (content of 98%) and 20.84 g of N,N'-dicyclohexylcarbodiimide (DCC) (content: 99%) were added to a ball mill and ground for 30 min. Add 14.86 g of glutamic acid (99%) and 8.42 g of sodium bicarbonate. After continuing to grind for 45 min, a white solid product was obtained which was the target collector product. After analysis and testing, The collector product 2-lauroamide glutaric acid content is 52.12%, The yield of 2-lauroyl glutaric acid based on lauric acid was 96.28%.
With boric acid;glutaminase; In water; at 30℃; for 22h;pH 11;
0.3 M glutamine and 1.5 M methylamine hydrochloride were reacted in the presence of 0.3 U glutaminase (commercially available) at 30 C. for 22 hours in a buffer solution of 0.05 M boric acid (pH 11), whereby 225 nm theanine was obtained. Reaction liquid was applied to Dowex 50×8 columnar chromatgraphy and Dowex 1×2 columnar chromatography (both made by Muromachi Chemical Co., Ltd.) thereby to be processed by ethanol, whereby an object substance is isolated from the reaction liquid. The isolated substance was applied to an amino acid analyzer (made by Hitachi Co.) and paper chromatography. Since the isolated substance behaved in the same way as a standard substance, it was recognized as L-theanine. When the isolated substance was processed by hydrolysis using hydrochloric acid or glutaminase, glutamine acid and ethylamine were produced in a ratio of 1:1. Thus, since the isolated substance was hydrolyzed by glutaminase, it was shown that ethylamine was gamma-ethylamine of glutamine acid. Furthermore, it was confirmed on the basis of glutamate dehydrogenase that glutamine acid produced by hydrolysis was L-glutamine acid. As a result, 8.5 g theanine was obtained.
With sodium hydroxide; triethylamine; In water; 1,2-dichloro-ethane; acetone;
EXAMPLE 1 Lauric acid 20 g was dissolved in 80 ml 1.2-dichloroethane and then 10 g triethylamine was added. The resulting solution was held at -2 - 5C and 8 g sulfuric anhydride was added dropwise with stirring. The reaction mixture was stirred at that temperature for 50 minutes and a solution of lauric acid-sulfuric acid mixed acid anhydride was prepared and employed in the following acylation. Sodium hydroxide 8 g was added to a suspension of 14.7 g L-glutamic acid in 72 ml water and 48 ml acetone. The resulting solution of disodium L-glutamate was cooled to 0C and 10 ml of 10 N aqueous sodium hydroxide solution and the mixed acid anhydride prepared in the above was added drop by drop under stirring while the pH was controlled to 12 - 13. This reaction solution was stirred for 1 hour at 0C. Thereafter, the reaction mixture was concentrated under reduced pressure to distill off the solvent. The residue was adjusted to a pH 1 with 6 N sulfuric acid. The crude crystals of N-lauroyl-L-glutamic acid precipitated, and were filtered and dried (25.7 g). They were washed with petroleum benzine and 23.2 g of the purified acid were recovered by filtration (70.3% yield) M.P. 102 - 105C. After recrystallization from ethanol-petroleum benzine, the elemental analysis was as follows:
With glutaminase; water; boric acid; at 30℃; for 22h;pH 11;Enzymatic reaction;
0.3 M glutamine and 1.5 M methylamine hydrochloride were reacted in the presence of 0.3 U glutaminase (commercially available) at 30°C for 22 hours in a buffer solution of 0.05 M boric acid (pH 11), whereby 225 nm theanine was obtained. Reaction liquid was applied to Dowex 50.x.8 columnar chromatography and Dowex 1.x.2 columnar chromatography (both made by Muromachi Chemical Co., Ltd.) thereby to be processed by ethanol, whereby an object substance is isolated from the reaction liquid. As a result, 8.5 g theanine was obtained. The isolated substance was applied to an amino acid analyzer (made by Hitachi Co.) and paper chromatography. Since the isolated substance behaved in the same way as a standard substance, it was recognized as L-theanine. When the isolated substance was processed by hydrolysis using hydrochloric acid or glutaminase, glutamine acid and ethylamine were produced in a ratio of 1:1. Thus, since the isolated substance was hydrolyzed by glutaminase, it was shown that ethylamine was gamma-ethylamine of glutamine acid. Furthermore, it was confirmed on the basis of glutamate dehydrogenase that glutamine acid produced by hydrolysis was L-glutamine acid.
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