User profiles for Nikolaos Grekas

Nikolaos Grekas

ELPEN Pharmaceutical Co Inc
Verified email at elpen.gr
Cited by 273

Determination of thiamine by continuous flow chemiluminescence measurement

N Grekas, AC Calokerinos - Talanta, 1990 - Elsevier
The chemiluminescence produced by oxidation of thiamine by ferricyanide in alkaline
medium has been investigated by using a simple continuous flow analyser and a procedure …

Pharmacokinetic study for the establishment of bioequivalence of two inhalation treatments containing budesonide plus formoterol

N Grekas, K Athanassiou… - Journal of Pharmacy …, 2014 - academic.oup.com
Objectives The aim of this study was to compare lung deposition and assess the bioequivalence
of two formulations containing budesonide and formoterol and being delivered via …

Continuous flow molecular emission cavity analysis of sulphite and sulphur dioxide

N Grekas, AC Calokerinos - Analyst, 1985 - pubs.rsc.org
A continuous flow method for the determination of sulphite (1–50 µg ml–1) by molecular
emission cavity analysis is described. The sample is mixed with an excess of orthophosphoric …

[HTML][HTML] Organic impurities in chemical drug substances

N Grekas - Pharmaceutical Technology Europe, 2005 - pharmtech.com
Chemical purity is the most important quality characteristic of a pharmaceutical substance.
This article describes the latest scientific and technological advances to meet recent …

Effect of sulphite on the determination of sulphide by continuous-flow molecular emission cavity analysis Determination of both anions in admixture

N Grekas, AC Calokerinos - Analytica chimica acta, 1989 - Elsevier
The effect of sulphite on the determination of sulphide after acidification and molecular emission
cavity analysis is investigated. This severe spectral interference can easily be overcome …

Determination of thiamine using continuous flow molecular emission cavity analysis

N Grekas, AC Calokerinos, TP Hadjiioannou - Analyst, 1989 - pubs.rsc.org
A continuous flow method for the determination of thiamine hydrochloride (20.0–240.0 µg ml–1,
5.9 × 10–5–7.1 × 10–4M) is described. The sample was mixed with an excess of sodium …

Continuous flow molecular emission cavity analysis of cephalosporins by alkaline degradation to sulphide

N Grekas, AC Calokerinos - Analyst, 1990 - pubs.rsc.org
A continuous flow method for the determination of some cephalosporins (cephradine,
cephalexin, cephalosporin C, cefadroxil, cephapirin and cephalothin) in the general range 10.0–…

[HTML][HTML] Specifications of chemical substances for pharmaceutical use

N Grekas - Pharmaceutical Technology Europe, 2004 - pharmtech.com
A substance is any matter that may be of human, animal, vegetable (plant) or chemical origin.
Substances intended for pharmaceutical purposes are used as active ingredients (drug …

[PDF][PDF] Chemiluminescence arising from the oxidation of bilirubin in aqueous media

LP Palilis, AC Calokerinos, N Grekas - Biomedical Chromatography, 1997 - academia.edu
Bilirubin (BIL) is a compound of great biological interest since it is found in human plasma as
metabolic product of haemoglobin and haeme proteins. Analytical methods currently used …

Reliability of the FSI-10 questionnaire for the assessment of the usability of inhalers in Greek patients

N Grekas, K Athanassiou, K Papataxiarchou, O Porichi… - 2011 - Eur Respiratory Soc
Introduction: The Feeling of Satisfaction with Inhaler (FSI-10) is a self-completed questionnaire
designed to assess the patient opinions regarding the satisfaction and usability of the …