title: Determination of free N-acetylneuraminic acid in human body fluids by high-performance liquid chromatography with fluorimetric detection.
abstract: Determinations of both the free and bound form of N-acetyl-neuraminic acid (NANA) in several human body fluids, such as serum, cerebrospinal fluid (CSF), saliva, urine, amniotic fluid, and milk were carried out by HPLC with fluorimetric detection. The method utilized 1,2-diamino-4,5-methylenedioxybenzene dihydrochloride (DMB) as a fluorimetric derivatizing reagent. Free-form NANA was obtained from the body fluids after ultrafiltration with Microcon 10 (YM-10 cellulose membrane, filtration limit M(r) = 10,000, Amicon). The DMB derivative of NANA was separated isocratically by a Nucleosil 5C18 column with a mixture of 0.1 M sodium phosphate buffer (pH 2.0)-methanol (75:25, v/v). A gradient elution system was used for urine analysis. Analysis times were 10-30 min. Recoveries of free NANA by ultrafiltration were satisfactory: 95.66 +/- 1.80% for serum and 97.27 +/- 1.55% for CSF, respectively. The high sensitivity and specificity render this method applicable to all the body fluids tested. Although a physiological role for free NANA has not yet been elucidated, the method presented promises to contribute to the basic understanding of the NANA metabolism.
authors.affiliation: Metabolism Research Laboratory, National Children's Medical Research Center, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hayakawa
authors.forename: C
authors.initials: C
authors.lastname: De Felice
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Iinuma
authors.forename: K
authors.initials: K
authors.lastname: Nihei
authors.forename: S
authors.initials: S
authors.lastname: Higuchi
authors.forename: T
authors.initials: T
authors.lastname: Ezoe
authors.forename: I
authors.initials: I
authors.lastname: Hibi
authors.forename: K
authors.initials: K
authors.lastname: Kurosawa
mesh_terms: D000293:Adolescent; D000328:Adult; D000653:Amniotic Fluid / Q000737:chemistry; D000818:Animals; D001826:Body Fluids / Q000737:chemistry*; D002417:Cattle; D002648:Child; D002675:Child, Preschool; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006736:Horses; D006801:Humans; D007223:Infant; D007564:Japan; D008297:Male; D008895:Milk, Human / Q000737:chemistry; D019158:N-Acetylneuraminic Acid; D051381:Rats; D012016:Reference Values; D012463:Saliva / Q000737:chemistry; D012794:Sialic Acids / Q000032:analysis*; D013552:Swine
chemical_list: D012794:Sialic Acids; D019158:N-Acetylneuraminic Acid