• Title, Summary, Keyword: aspartic acid

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Studios on the Glutamic Acid Production by an Alkalophilic Bacterium (알칼리성 세균에 의한 글루탐산 생산에 관한 연구)

  • Cho, Kae-Ran;Lee, Kang-Man;Bae, Moo
    • Microbiology and Biotechnology Letters
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    • v.17 no.6
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    • pp.563-567
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    • 1989
  • An alkalophilic bacterium isolated from compost was selected, identified and tested for the production of glutamic acid from ammonium fumarate. The bacterium was closely related to Bacillus brevis. The conditions for glutamic acid production were pH 8.0, 2% fumaric acid, and 0.8% nutrient broth. The mechanism of glutamic acid formation in this strain was postulated as following scheme. (1) Ammonium fumarate longrightarrow Aspartic acid (2) Aspartic acid + $\alpha$-Ketoglutaric acid longrightarrow Glutamic acid + Oxaloacetic acid.

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Synthesis of Decapeptide of L-Aspartic Acid and Benzyl-L-Aspartic Acid by Solid Phase Peptide Synthesis

  • Yoo, Bong-K.;Jalil Miah, M.A.;Lee, Eung-Seok;Han, Kun
    • Archives of Pharmacal Research
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    • v.28 no.7
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    • pp.756-760
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    • 2005
  • Polyene macrolide amphotericin B (AmB) is the drug of choice for the treatment of disseminated fungal infections. However, because of its pronounced side effects, the drug has limited applicability. There are few interesting reports, which state that co-administration of the drug with homo-peptide of polyaspartic acid reduces the side effects of the drug. In our present study, an approach has been made to systematically synthesize low molecular weight heteropeptides consisting of L-aspartic acid and its derivative. It was hypothesized that such heteropeptides will reduce the toxic side effects of the drug by facile hydrophobic binding between the polymer and the drug. We have employed the strategy of solid phase peptide synthesis (SPPS) to synthesize low molecular weight hetero-peptides by using L-aspartic acid and benzyl-L-aspartic acid to induce the hydrophobic binding between the peptide and the drug. In future, the proposed methodology can be employed to tailor other polypeptides substituted with benzyl groups to reduce the nephrotoxicity of AmB.

Characteristics of Chlorination Byproducts Formation of Amino Acid Compounds (아미노산 성분에서의 염소 소독부산물 생성 특성)

  • Son, Hee-Jong;Choi, Young-Ik;Bae, Sang-Dae;Jung, Chul-Woo
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.5
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    • pp.332-340
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    • 2009
  • This study was conducted to analyze and determine formation potentials for chlorination disinfection by-products (DBPs) from twenty amino acid compounds with or without $Br^-$. Two of twenty amino acid compound were tryptophan and tyrosine that were relatively shown high for formation of trihalomethanes (THMs)/dissolved organic carbon (DOC) whether or not $Br^-$ presented. Other 18 compounds were shown low for formation of THMs/DOC whether or not $Br^-$ presented. Five amino acid compounds that were tryptophan, tyrosine, asparagine, aspartic acid and histidine were shown high for formation of haloacetic acids (HAAs)/DOC whether or not $Br^-$ presented. Although formation of dichloroacetic acid (DCAA) was dominated in asparagine, aspartic acid and histidine, trichloroacetic acid (TCAA) was dominated in tryptophan and tryptophan. The formation of haloacetnitriles (HANs)/DOC whether or not $Br^-$ presented was high in Aspartic acid, histidine, asparagine, tyrosine and tryptophan. Specially, aspartic acid was detected 660.2 ${\mu}$g/mg (HAN/DOC). Although the formation of chloralhydrate (CH)/DOC was shown high in asparagine, aspartic acid, histidine, methionine, tryptophan and tyrosine, the formation of Chloropicrin (CP)/DOC was low (1 ${\mu}$g/mg) in twenty amino acid compounds. The formations of THM, HAA and HAN were also investigated in functional groups of amino acids. The highest formation of THM was shown in amino acids compounds (tryptophan and tyrosine) with an aromatic functional group. Highest, second-highest, third-highest and fourth-highest functional groups for formation of HAA were aromatic, neutral, acidic and basic respectively. In order of increasing functional groups for formation of HAN were acidic, basic, neutral and aromatic.

Development of a UPLC-MS/MS method for the therapeutic monitoring of L-asparaginase

  • Jeong, Hyeon-Cheol;Kim, Therasa;Yang, Deok-Hwan;Shin, Kwang-Hee
    • Translational and Clinical Pharmacology
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    • v.26 no.3
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    • pp.134-140
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    • 2018
  • This study aimed to develop a UPLC-MS/MS method for determining plasma levels of L-aspartic acid and L-asparagine and the activity of L-asparaginase. L-aspartic acid, L-asparagine, and L-aspartic acid-2,3,3-$d_3$ were extracted from human plasma by protein precipitation with sulfosalicylic acid (30%, v/v). The plasma samples were analyzed using an Imtakt Intrada amino acid analysis column with 25 mM ammonium formate and 0.5% formic acid in acetonitrile as the mobile phase with step gradient method at a flow rate of 0.5 mL/min. The injection volume was $5{\mu}L$, and the total run time was 15 min. Inter- and intra-batch accuracies (%) ranged from 96.62-106.0% for L-aspartic acid and 89.85-104.8%, for L-asparagine, and the coefficient of variation (CV%) did not exceed 7%. The validation results for L-aspartic acid and L-asparagine satisfied the specified criterion, however, the results for L-asparaginase activity assay showed a borderline validity. This study could be a foundation for further development of therapeutic drug monitoring systems using UPLC-MS/MS.

Variation of Asparagine and Aspartic Acid Contents in Beansprout Soybeans (나물콩 품종의 Asparagine과 Aspartic acid 함량 변이)

  • 이준찬;황영현
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.41 no.5
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    • pp.592-599
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    • 1996
  • The variations of asparagine and aspartic acid contents among the soybean varieties and in the different parts of soybean sprout after the different durations of storage were investigated. Asparagine and aspartic acid are known to have the detoxifying effects on acetaldehyde, which is highly toxic metabolites in the process of alcohol metabolism in the human body. The contents of asparagine and aspartic acid of beansprout showed continuosuly increasing trends along with the days to cultivation with a great varietal difference, especially in the roots. The duration of seed storage did not affect contents of asparagine content; the longer storage decreased aspartic acid content remarkably.

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A Study of Specific Amino acid Characteristics on the Blood in Four Type of Physical Constitution (체질(體質)에 따른 혈중(血中) Amino acid 특성(特性)에 관(關)한 연구(硏究))

  • Yeun, Hong-Sik
    • The Journal of Internal Korean Medicine
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    • v.13 no.2
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    • pp.126-133
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    • 1992
  • Comparative amino acid quantities on the blood analysis was carried out to investigate the amino acid specific characters on the blood in four type of physical constitution 1. In TAE-EUM-IN group, compared with control group, the proline and the serine were more observed. 2. In SO-EUM-IN group, compared with control group, the aspartic acid was more observed. 3. In SO-YANG-IN group, compared with control group, the proline was more observed. but the threonine and the aspartic acid were less observed. 4. In SO-EUM-IN group, compared with TAE-EUM-IN group, the aspartic acid and the serine were more observed. 5. In SO-YANG-IN group, compared with TAE-EUM-IN group, the serine and the proline were more observed, but the glutamic acid and the threonine were less observed. 6. In SO-YANG-IN group, compared with SO-EUM-IN group, the threonine and the aspartic acid were less observed.

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Characterizations of Novel Poly(aspartic acid) Derivatives Conjugated with γ-Amino Butyric Acid (GABA) as the Bioactive Molecule

  • Kim, Seung-Il;Son, Chang-Mo;Jeon, Young-Sil;Kim, Ji-Heung
    • Bulletin of the Korean Chemical Society
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    • v.30 no.12
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    • pp.3025-3030
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    • 2009
  • Novel poly(aspartic acid) derivatives conjugated with $\gamma$-amino butyric acid, GABA, moieties, and their amphiphilic analogs were synthesized and characterized. The chemical structures of these polymers were confirmed by FT-IR and $^1H$ NMR spectroscopy. Their physicochemical properties in aqueous media were characterized by electrophonetic light scattering spectrophotometry (ELS), acid-base titration, and UV-spectroscopy. In addition, the in vitro cell activity of the GABA-conjugated polymer was examined. These results indicated that GABA-conjugated poly(aspartic acid) derivatives showed cell-growth activity and nanoparticle formation of a suitable size within aqueous media. These polymers have potential application in the cosmetic and pharmaceutical fields.

Kinetic Study on the Enzymatic Production of D-Alanine from D-Aspartic Acid

  • Lee, Jae-Heung;Sung, Moon-Hee;Jeon, Yeong-Joong
    • Journal of Microbiology
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    • v.40 no.1
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    • pp.33-37
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    • 2002
  • An enzymatic reaction for the production of D-alanine from D-aspartic acid and pyruvate as substrates by a thermostable D-amino acid aminotransferase (D-AAT) was investigated at various conditions In the temperature range of 40-70$\^{C}$ and pH range of 6.0-9.5. The D-AAT was produced with recombinant E. coli BL21, which hosted the chimeric plasmid pTLK2 harboring the D-AAT from the novel thermophilic Bacillus sp. LK-2. The enzyme reaction was shown to follow the Ping Pong Bi Bi mechanism. The K$\_$m/ values for D-aspartic acid and pyruvate were 4.38 mar and 0.72 mM, respectively. It was observed that competitive inhibition by D-alanine, the product of this reaction, was evident with the inhibition constant K$\_$i/ value of 0.1 mM. A unique feature of this reaction scheme is that the decorboxylation of oxaloacetic acid, one of the products, spontaneously produces pyruvate. Therefore, only a catalytic amount of pyruvate is necessary for the enzyme conversion reaction to proceed. A typical time-course kinetic study skewed that D-alanine up to 88 mM could be produced from 100 mM of D-aspartic acid with a molar yield of 1.0.

Studies on the Chemical Composition of Some Fruit Vegetables and Fruits in Korea(I) -On the Free Amino Acid and Sugar Contents in Tomato, Watermelon, Muskmelon, Peach and Plum (한국산(韓國産) 주요과채류(主要果菜類) 및 과실류(果實類)의 화학성분(化學成分)에 관(關)한 연구(硏究) (제1보)(第1報) -토마토.수박.참외.복숭아.자두중(中)의 유리(遊離)아미노산 및 당(糖)의 함량(含量)-)

  • Lee, H.B.;Yang, C.B.;Yu, T.J.
    • Korean Journal of Food Science and Technology
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    • v.4 no.1
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    • pp.36-43
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    • 1972
  • A survey of the free amino acids and free sugars in tomato, watermelon, muskmelon, peach and plum was made by means of amino acid autoanalyzer and thin layer chromatography. The results of the survey are summarized as follows. 1) Fifteen amino acids found in fruit were aspartic acid, glutamic acid, alanine, serine, asparagine, lysine, valine, glycine, methionine, histidine, threonine, leucine, isoleucine, proline and arginine, and an unknown was found. 2) Ten kinds of amino acids were detected in tomato, peach and plum, thirteen amine acids in watermelon and muskmelon (edible part), and eleven amino acids in muskmelon (rind). 3) In general, these fruits contained similar amounts of these thirteen amino acids, and although they were not outstandingly high in any one acid they did contain a nutritionally well-balanced mixture. 4) Amino acids found in the greatest amount in fruit were following: glutamic acid and aspartic acid in tomato, asparagine and lysine in watermelon, alanine, serine and aspartic acid in musk-melon, and aspartic acid and serine in peach and plum. 5) Glucose, fructose, sucrose and maltose were detected in all fruit. The contents of glucose and fructose were high, and those of sucrose and maltose were low.

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