title: Stability of hydrophilic vitamins mixtures in the presence of electrolytes and trace elements for parenteral nutrition: a nuclear magnetic resonance spectroscopy investigation.
abstract: In total parenteral nutrition (TPN), especially in the case of preterm infants, simultaneous administration of vitamins and trace elements is still a problematic issue: guidelines put in evidence the lack of specific documentation. In this work NMR spectroscopy was applied to the study of vitamins (pyridoxine hydrochloride, thiamine nitrate, riboflavin-5'-phosphate and nicotinamide) stability in presence of salts and trace elements. Vitamins in D2O were first analyzed by (1)H NMR spectroscopy in absence of salts and trace elements; changes in chemical shifts or in diffusion coefficients, measured by NMR DOSY technique, were analyzed. The effects of salts and trace elements on single vitamins and on their admixtures were then investigated by performing quantitative analyses during 48h. Selected vitamins are subject to intermolecular interactions. No degradative effects were observed in presence of salts and trace elements. Only riboflavin-5'-phosphate is subject to precipitation in presence of divalent cations; however, at low concentration and in presence of other vitamins this effect was not observed. Solutions analyzed, in the condition of this study, are stable for at least 48h and vitamins and trace elements can be administered together in TPN.
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via G. Moruzzi 3, 56124 Pisa, Italy. Electronic address: gloria.uccello.barretta@unipi.it.
authors.forename: Gloria
authors.initials: G
authors.lastname: Uccello-Barretta
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via G. Moruzzi 3, 56124 Pisa, Italy.
authors.forename: Federica
authors.initials: F
authors.lastname: Balzano
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via G. Moruzzi 3, 56124 Pisa, Italy.
authors.forename: Federica
authors.initials: F
authors.lastname: Aiello
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via G. Moruzzi 3, 56124 Pisa, Italy.
authors.forename: Niccolò
authors.initials: N
authors.lastname: Falugiani
authors.affiliation: U.O. Farmaceutica - Gestione del farmaco, Azienda Ospedaliero Universitaria Pisana, via Roma 67, 56126 Pisa, Italy.
authors.forename: Ielizza
authors.initials: I
authors.lastname: Desideri
mesh_terms: D004355:Drug Stability; D004573:Electrolytes / Q000737:chemistry*; D005486:Flavin Mononucleotide / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D009536:Niacinamide / Q000737:chemistry; D010289:Parenteral Nutrition, Total / Q000379:methods; D011736:Pyridoxine / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013831:Thiamine / Q000737:chemistry; D014131:Trace Elements / Q000737:chemistry*; D014815:Vitamins / Q000737:chemistry*
chemical_list: D004573:Electrolytes; D012996:Solutions; D014131:Trace Elements; D014815:Vitamins; D009536:Niacinamide; D005486:Flavin Mononucleotide; D011736:Pyridoxine; D013831:Thiamine
keywords: Electrolytes; Hydrophilic vitamins; Nuclear magnetic resonance; Total parenteral nutrition; Trace elements