1
|
Reliable and sensitive procedure for quantification of antiseptic chlorhexidine di-gluconate via quenching the fluorescence of lanthanide-EDTA- probe. Microchem J 2022. [DOI: 10.1016/j.microc.2021.106817] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
2
|
Roy E, Patra S, Madhuri R, Sharma PK. Development of an imprinted polymeric sensor with dual sensing property for trace level estimation of zinc and arginine. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 49:25-33. [DOI: 10.1016/j.msec.2014.12.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 10/28/2014] [Accepted: 12/17/2014] [Indexed: 11/25/2022]
|
3
|
Kandhro AJ, Khuhawar MY. HPLC DETERMINATION OF GUANIDINO COMPOUNDS IN SERUM OF UREMIC PATIENTS USING METHYLGLYOXAL AS DERIVATIZING REAGENT. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.720328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A. J. Kandhro
- a Institute of Advanced Research Studies in Chemical Sciences, University of Sindh , Jamshoro , Pakistan
| | - M. Y. Khuhawar
- a Institute of Advanced Research Studies in Chemical Sciences, University of Sindh , Jamshoro , Pakistan
| |
Collapse
|
4
|
Gatti R, Gioia M. Liquid chromatographic analysis of guanidino compounds using furoin as a new fluorogenic reagent. J Pharm Biomed Anal 2008; 48:754-9. [DOI: 10.1016/j.jpba.2008.07.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Revised: 07/18/2008] [Accepted: 07/21/2008] [Indexed: 11/27/2022]
|
5
|
Gatti R, Gioia MG. Anisoin: A useful pre-chromatographic derivatization fluorogenic reagent for LC analysis of guanidino compounds. J Pharm Biomed Anal 2006; 42:11-6. [PMID: 16460903 DOI: 10.1016/j.jpba.2005.12.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2005] [Accepted: 12/28/2005] [Indexed: 11/29/2022]
Abstract
The use of anisoin as pre-chromatographic reagent for LC analysis of guanidino compounds is proposed. The reagent reacts (5 min at 100 degrees C) with guanidino function and the resulting adducts can be chromatographed under reversed-phase conditions. A fluorescence detector (lambda(ex)=325 nm; lambda(em)=435 nm) was used to detect guanidino adducts. The derivatization and chromatographic conditions were optimised by a series of experiments. Application to the determination of arginine and creatine in pharmaceuticals and arginine, guanidine, methylguanidine, guanidinosuccinic acid, beta-guanidinopropionic acid, gamma-guanidinobutyric acid, guanidinoacetic acid and homoarginine in human urine is described. Quantitation limits ranged from 6 to 30 fmol, except for creatine (510 fmol).
Collapse
Affiliation(s)
- R Gatti
- Dipartimento di Scienze Farmaceutiche, Alma Mater Studiorum-Università di Bologna, Via Belmeloro 6, 40126 Bologna, Italy.
| | | |
Collapse
|
6
|
Wang Y, Chen LLH, Chien YW. HPLC ANALYSIS OF GONADOTROPIN-RELEASING HORMONE AND ITS ANALOGUES USING BENZOIN AS A FLUOROGENIC REAGENT. J LIQ CHROMATOGR R T 2006. [DOI: 10.1081/jlc-100101811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Yun Wang
- a Controlled Drug-Delivery Research Center, College of Pharmacy, Rutgers University , P.O. Box 10406, New Brunswick , NJ , 08854 , U.S.A
| | - Li-Lan H. Chen
- a Controlled Drug-Delivery Research Center, College of Pharmacy, Rutgers University , P.O. Box 10406, New Brunswick , NJ , 08854 , U.S.A
| | - Yie W. Chien
- b Controlled Drug-Delivery Research Center, College of Pharmacy, Rutgers University , P.O. Box 10406, New Brunswick , NJ , 08854 , U.S.A
| |
Collapse
|
7
|
Francis PS, Adcock JL, Costin JW, Agg KM. Chemiluminescence detection of arginine-containing peptides separated with monolithic high-performance liquid chromatography. Anal Biochem 2005; 336:141-3. [PMID: 15582571 DOI: 10.1016/j.ab.2004.09.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2004] [Indexed: 11/18/2022]
Affiliation(s)
- Paul S Francis
- School of Biological and Chemical Sciences, Deakin University, Geelong, Vic. 3217, Australia.
| | | | | | | |
Collapse
|
8
|
Frerichs VA, Herrmann JK, Aguirre A, Colón LA. Trace level determination of substance P using capillary electrophoresis and laser-induced fluorescence. Microchem J 2004. [DOI: 10.1016/j.microc.2004.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
9
|
Kajiro T, Fukushima T, Imai K. Determination of bradykinin in rat urine by coupled-column high pressure liquid chromatography with precolumn derivatization with a water-soluble fluorogenic reagent. Anal Biochem 2001; 297:52-9. [PMID: 11567527 DOI: 10.1006/abio.2001.5315] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bradykinin (BK) in rat urine was determined by coupled-column HPLC with precolumn fluorogenic derivatization with a water-soluble reagent, 3-(7-fluoro-2,1,3-benzoxadiazole-4-sulfonamido)benzenesulfonic acid (m-BS-ABD-F). The derivatization of BK with m-BS-ABD-F was completed at 70 degrees C for 100 min and gave only a single peak of BK derivative in addition to the peaks of the blank. The hydrophilicity of the derivatization reagent effectively prevented the adsorption of BK during the sample pretreatment and improved the recovery of BK. Good linearity was shown between the amount of BK spiked in urine (0-10 pmol) and the peak area of the BK derivatives (correlation coefficients >0.999), and the detection limits of the BK derivative were 35 fmol (S/N = 3). The precisions (cv, %) of intra- and interday assay were not more than 5.5% and the accuracies were in the range of 95.3-111% (1 and 5 pmol of BK in urine, n = 3). Although the peak regarded as that of the BK derivative rapidly decreased after incubation at 37 degrees C, addition of urinary kininase inhibitors to the urine samples drastically suppressed the decrease of this peak, confirming that the identified peak was that of the BK derivative. The urinary kinin excretion in male SD rats (9-11 weeks old) determined by the present method was 56.0 +/- 22.1 pg/min/kg (mean +/- SE, n = 5).
Collapse
Affiliation(s)
- T Kajiro
- Laboratory of Bio-Analytical Chemistry, Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | | | | |
Collapse
|
10
|
Krull IS, Strong R, Sosic Z, Cho BY, Beale SC, Wang CC, Cohen S. Labeling reactions applicable to chromatography and electrophoresis of minute amounts of proteins. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1997; 699:173-208. [PMID: 9392375 DOI: 10.1016/s0378-4347(97)00157-6] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Chromatography and electrophoresis have become extremely valuable and important methods for the separation, purification, detection and analysis of biopolymers and HPLC/HPCE may become the premier, preferable approaches for both qualitative and quantitative analyses of most proteins, especially from recombinant materials. This includes smaller peptides, polypeptides, proteins, antibodies and all types of protein or antibody-conjugates (antibody-enzyme, protein-fluorescent probe, antibody-drug and so forth). This entire Topical Issue of Journal of Chromatography emphasizes the application of chromatography and electrophoresis to protein analysis. This particular review deals with approaches to the selective tagging or labeling of proteins at trace (minute) levels, again using either chromatography or electrophoresis, with the emphasis on modern HPLC/HPCE methods and approaches. We discuss here both pre- and post-column labeling methods and reagents, techniques for realizing selective labeling of proteins or antibodies, applicable approaches to protein preconcentration in both HPLC and HPCE areas and in general, methods for improving (lowering) detection limits for proteins utilizing chemical or physical derivatization and/or preconcentration techniques. There are really two major goals or emphases in that which follows: (1) methods for selective labeling of proteins prior to or after HPLC/HPCE and (2) labeling of proteins at trace levels for improved separation-detection and lowered detection limits. We discuss here a large number of specific references related to both pre- and post-column/capillary derivatizations for proteins, as well as methods for improved detectability in both HPLC and HPCE by, for example, analyte preconcentration on a solid-phase extractor or membrane support, capillary isotachophoresis and other methods. Selective reactions or derivatizations on proteins refers to the ability to tag the protein at specific (e.g. reactive amino sites) in a controlled manner, with the products having the same number of tags all at the very same site or sites. The products are all the same species, having the same number of tags at the same locations on the protein. Selective reactions can also refer to the idea of tagging all of the protein sample at only a single, same site or at all available sites, homogeneously.
Collapse
Affiliation(s)
- I S Krull
- Department of Chemistry, Northeastern University, Boston, MA 02115, USA
| | | | | | | | | | | | | |
Collapse
|
11
|
Boppana VK, Miller-Stein C. High-performance liquid chromatographic determination of peptide drugs in biological fluids by means of pre- and post-column fluorescence derivatization techniques. Anal Chim Acta 1997. [DOI: 10.1016/s0003-2670(97)00375-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
12
|
Liquid chromatography of peptides treated with fluorogenic reagents and its application to analyses of opioid peptides, their precursors and related enzymes in rat brain. Anal Chim Acta 1997. [DOI: 10.1016/s0003-2670(97)00089-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
13
|
|
14
|
Jordan T, Walus L, Velickovic A, Last T, Doctrow S, Liu H. A competitive chemiluminescent enzyme-linked immunosorbent assay for the determination of RMP-7 in human blood. J Pharm Biomed Anal 1996; 14:1653-62. [PMID: 8887712 DOI: 10.1016/0731-7085(96)01805-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
RMP-7, a bradykinin agonist, is a synthetic nonapeptide designed to enhance the delivery of therapeutics to the central nervous system. A sensitive, competitive chemiluminescent enzyme-linked immunosorbent assay (ELISA) for quantifying RMP-7 in human blood samples has been developed. Rabbit antibodies against RMP-7 were produced using the conjugate of RMP-7 to keyhole limpet hemocyanin through glutaraldehyde. Biotinylated RMP-7, conjugated via N-hydroxysuccinimide ester, was used as the tracer. A premixed solution of biotinylated alkaline phosphatase and avidin was used to quantify the tracer, with a dioxetane-based compound as the chemiluminescent substrate. The method involves treating blood samples with organic solvents to precipitate proteins, evaporating the supernatants to dryness, reconstituting residues in PBS and assaying the buffer solutions with the ELISA. The assay, using 1.0 ml of whole blood, has precision and accuracy within +/- 20% over the concentration range 25-800 pg ml-1. There are no significant endogenous interferences. The assay has been successfully used to support clinical trials of RMP-7.
Collapse
Affiliation(s)
- T Jordan
- Alkermes, Inc., Cambridge, MA 02139, USA
| | | | | | | | | | | |
Collapse
|
15
|
Cui H, Reubsaet JL, Bult A. Precolumn fluorescence derivatization of the antagonist [Arg6,D-Trp7,9,MePhe8]-substance P[6-11] with benzoin in high-performance liquid chromatography and selective detection of arginine-containing fragments in its degradation products. J Chromatogr A 1996; 736:91-6. [PMID: 8673253 DOI: 10.1016/0021-9673(95)01359-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Precolumn fluorescence derivatization for the determination of the antagonist [Arg6,D-Trp7,9,MePhe8]-Substance P¿6-11¿ (antagonist G) using benzoin in HPLC was studied. Under the conditions chosen (0.067 M NaOH, heating at 100 degrees C for 10 s), a good yield of fluorescent derivatives was obtained and no methodology-related degradation occurred. The detection limit of antagonist G was 0.21 nmol/ml. The method has been applied to the selective and sensitive detection of arginine-containing fragments in degradation products of antagonist G.
Collapse
Affiliation(s)
- H Cui
- Department of Pharmaceutical Analysis, Faculty of Pharmacy, Utrecht University, Netherlands
| | | | | |
Collapse
|
16
|
Selective determination of peptides containing specific amino acid residues by high-performance liquid chromatography and capillary electrophoresis. J Chromatogr A 1995. [DOI: 10.1016/0021-9673(95)00167-l] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Ohkura Y, Kai M, Nohta H. Fluorogenic reactions for biomedical chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1994; 659:85-107. [PMID: 7820282 DOI: 10.1016/0378-4347(94)00125-1] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A number of fluorogenic reactions, which have been used for HPLC detection systems by means of pre- and/or postcolumn derivatization, are surveyed with respect to both sensitivity and selectivity for the determination of biomedically important substances. For the derivatization of the substances, two types of fluorogenic reactions, fluorescence-generating and fluorescence-tagging, have been studied. The former are usable in most instances for both pre- and postcolumn derivatization methods, and the latter only for precolumn derivatization methods. HPLC methods utilizing the fluorogenic reactions allow analytes to be detected at picomole-subfemtomole levels. In the fluorescence-generating reactions, several fluorogenic reagents possessing two or more reactive sites in the molecule, which show molecular recognition for a variety of analytes, permit facile and reproducible detection in HPLC because there are fewer interferences from biological matrices.
Collapse
Affiliation(s)
- Y Ohkura
- Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | | | | |
Collapse
|
18
|
Wu ST, Stampfli HF, Banks CM, Emm TA, Kapil RP, Padovani PK, Lee WM, Huang SM. Determination of DMP 728, a IIb/IIIa receptor antagonist, in rat and dog plasma by high-performance liquid chromatography with fluorimetric detection. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1994; 657:254-60. [PMID: 7952079 DOI: 10.1016/0378-4347(94)80097-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A specific and sensitive HPLC assay for the determination of DMP 728 in dog and rat plasma has been developed. The method involves solid-phase extraction of DMP 728 and the internal standard from plasma using a C2 column. The extracted compounds are derivatized with benzoin under alkaline conditions. Using a mixture of acetonitrile and 0.1 M potassium phosphate buffer (25:75, v/v, pH 7.4) as mobile phase, the derivatized products are separated on a Regis semipermeable surface C8 column and monitored fluorometrically using 325 nm and 425 nm as excitation and emission wavelengths, respectively. The assay is linear from 2.5 to 1000 ng/ml in dog plasma and from 5 to 1000 ng/ml in rat plasma. The limit of quantitation is 2.5 ng/ml using 0.5 ml of dog plasma and 5 ng/ml using 0.5 ml of rat plasma. The assay has been used in pharmacokinetic studies of DMP 728 in dogs and rats.
Collapse
Affiliation(s)
- S T Wu
- DuPont Merck Pharmaceutical Company, Drug Metabolism and Pharmacokinetics Section, Newark, DE 19714
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Pre-column fluorescence derivatization of peptides containing arginine aldehyde moiety in high-performance liquid chromatography. Chromatographia 1993. [DOI: 10.1007/bf02263845] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
20
|
Kojima E, Ohba Y, Kai M, Ohkura Y. Phenylglyoxal and glyoxal as fluorogenic reagents selective for N-terminal tryptophan-containing peptides. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)80253-h] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
21
|
Yokoyama T, Kinoshita T. High-performance liquid chromatographic determination of proteins by post-column fluorescence derivatization with thiamine reagent. J Chromatogr A 1990; 518:141-8. [PMID: 1701770 DOI: 10.1016/s0021-9673(01)93169-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A post-column derivatization method for the high-performance liquid chromatography of peptides and proteins giving a fluorescence intensity proportional to the number of peptide bonds is described. Peptide bonds were chlorinated with hypochlorite and the N-chlorite formed was allowed to react with thiamine to give fluorescent thiochrome. This method was applied the determination of membrane-forming proteins of microorganisms.
Collapse
Affiliation(s)
- T Yokoyama
- Central Research Laboratory, SS Pharmaceutical Co. Ltd., Chiba, Japan
| | | |
Collapse
|
22
|
Boppana VK, Rhodes GR. High-performance liquid chromatographic determination of an arginine-containing octapeptide antagonist of vasopressin in human plasma by means of a selective post-column reaction with fluorescence detection. J Chromatogr A 1990; 507:79-84. [PMID: 2380310 DOI: 10.1016/s0021-9673(01)84183-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A novel high-performance liquid chromatographic method was developed for the determination in plasma samples of the synthetic octapeptide SK&F 105494 (O-ethyl-D-tyrosyl-L-phenylalanyl-L-valyl-L-asparaginyl-5-[1- (carboxymethyl)cyclohexyl]-L-norvalyl-L-arginyl-D-arginamide , cyclic (5-1) peptide), an active aquaretic agent which significantly increases water excretion in experimental animal models through competitive antagonism of renal epithelial vasopressin receptors. The method involves isolation of Sk&F 105494 from plasma samples by solid phase extraction prior to chromatographic analysis. Following chromatographic separation, in-line fluorescence detection was accomplished via a selective-post-column reaction of the guanidino group of the arginine moiety of the peptide with alkaline ninhydrin to generate a highly fluorescent product. Optimization of the post-column reaction conditions and the use of high-performance liquid chromatography columns of reduced internal diameter (2.1 mm), resulted in an on-column detection limit of 50 pg (45 fmol). The limit of sensitivity in plasma was 0.5 ng/ml. The assay was linear over the range 0.5-100 ng/ml. Precision and accuracy were within 11% across the calibration range. The assay was shown to be suitable to study the pharmacokinetics of SK&F 105494 in human subjects and animals. In addition, the methodology developed has general applicability in the detection of arginine-containing peptides in biological matrices.
Collapse
Affiliation(s)
- V K Boppana
- Department of Drug Metabolism, Smith Kline and French Laboratories, King of Prussia, PA 19406-0939
| | | |
Collapse
|
23
|
Ohno M, Kai M, Ohkura Y. High-performance liquid chromatographic determination of substance P-like arginine-containing peptide in rat brain by on-line post-column fluorescence derivatization with benzoin. JOURNAL OF CHROMATOGRAPHY 1989; 490:301-10. [PMID: 2475517 DOI: 10.1016/s0378-4347(00)82788-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A high-performance liquid chromatographic method with fluorescence detection is described for the determination of substance P, one of the neuropeptides, in the hypothalamus tissue of rat brain. The detection is based on on-line post-column fluorescence derivatization selective for arginine-containing peptides. The endogenous substance P-like arginine-containing peptide extracted from the tissue and [D-Phe11]-neurotensin as an internal standard were separated from various interfering substances on a reversed-phase column (TSKgel ODS-120T) by gradient elution with acetonitrile-phosphate buffer (pH 2.3). The peptides in the eluate were then automatically converted into fluorescent derivatives for detection by reaction with benzoin. Arginine-containing fragments produced by the enzyme reaction of substance P in the chromatographic fraction with trypsin were also detected, for the identification of the endogenous substance P-like arginine-containing peptide. The method was sensitive enough to permit the quantitative determination of the peptide at a concentration as low as 580 fmol/mg of protein in the brain homogenate. The concentration values of the substance P-like arginine-containing peptide in the tissue were 9.45 +/- 1.50 pmol/mg of protein (six determinations).
Collapse
Affiliation(s)
- M Ohno
- Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | | | | |
Collapse
|
24
|
Kai M, Ishida J, Ohkura Y. High-performance liquid chromatographic determination of leucine-enkephalin-like peptide in rat brain by pre-column fluorescence derivatization involving formylation followed by reaction with 1,2-diamino-4,5-dimethoxybenzene. JOURNAL OF CHROMATOGRAPHY 1988; 430:271-8. [PMID: 3235503 DOI: 10.1016/s0378-4347(00)83162-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Fluorimetrically reactive leucine-enkephalin, one of the opioid peptides in rat brain tissues such as the striatum, cortex and hypothalamus, was assayed by reversed-phase high-performance liquid chromatography with fluorescence detection based on pre-column derivatization of the tyrosyl residue. The tyrosine-containing peptides extracted from the tissue were first formylated with chloroform in an alkaline medium, and the resulting aldehydes were then converted into highly fluorescent derivatives by reaction with 1,2-diamino-4,5-dimethoxybenzene. The derivative of leucine-enkephalin-like peptide in tissue was separated from various other fluorescent compounds on a reversed-phase column (TSK gel ODS-120T) by isocratic elution and detected by fluorimetry. The concentrations of the leucine-enkephalin-like peptide in the tissues were 20-245 pmol/g. The method is sensitive enough to permit the quantitative determination of the endogenous peptide at concentrations as low as 5.6 pmol/g in brain tissues.
Collapse
Affiliation(s)
- M Kai
- Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | | | | |
Collapse
|
25
|
Rhodes GR, Boppana VK. High-performance liquid chromatographic analysis of arginine-containing peptides in biological fluids by means of a selective post-column reaction with fluorescence detection. J Chromatogr A 1988; 444:123-31. [PMID: 3204127 DOI: 10.1016/s0021-9673(01)94015-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Highly sensitive and specific high-performance liquid chromatographic methodology for the fluorescence detection of arginine-containing peptides in biological matrices is described. Following HPLC separation, a post-column reaction of the guanidino group of the arginine moiety with ninhydrin under basic conditions is utilized to generate a fluorescent peptide product which can be measured at high sensitivity. Careful optimization of the post-column reaction conditions, and the use of HPLC columns of reduced internal diameter, resulted in on-column detection limits as low as 50 fmol. Application to the determination of synthetic arginine-containing vasopressin antagonists in human plasma resulted in a quantitative response which is linear over the range 0.5-100 pmol/ml. The assay method is sufficiently sensitive, accurate, and precise for use in pharmacokinetic studies of these synthetic peptides. The methodology also has general applicability in the detection of naturally occurring arginine-containing peptides.
Collapse
Affiliation(s)
- G R Rhodes
- Department of Drug Metabolism, Smith Kline and French Laboratories, King of Prussia, PA 19406-0939
| | | |
Collapse
|
26
|
Ohno M, Kai M, Ohkura Y. On-line post-column fluorescence detection for N-terminal tyrosine-containing peptides in high-performance liquid chromatography. JOURNAL OF CHROMATOGRAPHY 1987; 421:245-56. [PMID: 3429581 DOI: 10.1016/0378-4347(87)80405-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A detection system based on on-line post-column fluorescence derivatization is described for the determination of N-terminal tyrosine-containing peptides by reversed-phase high-performance liquid chromatography. The peptides are automatically converted into fluorescent derivatives by reaction with hydroxylamine, cobalt (II) and borate after peptide separation on a reversed-phase column (TSKgel ODS-120T) followed by passage through an ultraviolet absorbance detector. The reaction system permits the fluorescence detection at 435 nm (emission) with excitation at 335 nm for N-terminal tyrosine-containing synthetic peptides in as little as picomole amounts. The facile fluorescence detection of N-terminal tyrosine-containing fragments produced from methionine-enkephalin by enzymatic degradation using a rat brain homogenate was achieved by comparison with the ultraviolet absorption detection at 215 nm.
Collapse
Affiliation(s)
- M Ohno
- Faculty of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | | | | |
Collapse
|
27
|
Kai M, Ohkura Y. Fluorescence derivatization of bioactive peptides for high-performance liquid chromatography. Trends Analyt Chem 1987. [DOI: 10.1016/0165-9936(87)87053-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|