Drugs online research references
Biosens Bioelectron. 1992;7(9):631-5.
Implementation of a thermal biosensor in a process environment: on-line monitoring of penicillin V in production-scale fermentations.
Rank M, Danielsson B, Gram J.
Chemical Center, University of Lund, Sweden.
The production of penicillin V was monitored in 0.5 m3 and 160 m3 bioreactors. The thermal biosensor was an enzyme thermistor modified for split-flow analysis. The heat signal generated in the enzyme column was corrected for any nonspecific heat with the use of an identical but inactive reference column. The on-line monitoring was performed in the fermentation pilot plant and in a fermentation plant of Novo Nordisk A/S. Immobilized beta-lactamase was used to monitor three consecutive 0.5 m3 penicillin fermentations. Broth samples were continuously filtered through a tangential flow filtration unit in a sterile external loop. The on-line penicillin V values were 10% higher than those obtained by off-line HPLC analysis. Alternatively a polypropylene filtration probe was inserted into a 160 m3 bioreactor and samples were withdrawn at 0.5 ml/min. The same experiments were repeated with purified and immobilized penicillin V acylase. The on-line penicillin V values obtained with this enzyme correlated very well with those from HPLC analysis. The on-line monitoring was controlled and analysed by a software program written in Labtech Notebook.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1292520&dopt=Abstract
allergi.sdu.dk
INTRODUCTION: We describe procedures in and findings of investigation for allergy to penicillin as it was performed at the Dermatological Department and the Allergy Centre of Odense University Hospital in the 5-year period 1997-2001 and compare history with findings on skin tests and systemic challenge. MATERIAL AND METHODS: Retrospective evaluation of findings in the investigation of penicillin allergy. A total of 109 patients with a history of reaction to treatment with penicillins and a negative specific IgE for penicillins G and V were successively skin prick tested, intracutaneously skin tested, challenged orally and by intramuscular injection. Further testing was cancelled when a positive result occurred. RESULTS: Fifteen of 109 (13.7%) had positive reactions on investigation. There was no correlation between the type and severity of cutaneous or systemic reactions to penicillin or presence of other allergies and test positivity or negativity. 20% of the test-positive developed severe systemic reactions (respiratory, cardiovascular) upon systemic challenge. DISCUSSION: 13.7% in a selected patient material with a history of penicillin allergy and negative specific IgE were found to have reaction to penicillin upon investigation. A high percentage of patients (20%) experienced systemic reactions to provocation. This finding has resulted in new procedures for the investigation of allergy to penicillin in our clinic.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12968411&dopt=Abstract
Roum Arch Microbiol Immunol. 1992 Jul-Sep;51(3):157-64.
Evaluating the minimum active concentrations of penicillin G and V and of retard forms in clinical conditions.
Dorobat O, Romanof E, Erscoiu S, Ceausu E, Posticescu R, Lazaroae D.
Cantacuzino Institute, Bucharest, Romania.
Following several signals indicating the inefficiency of the clinical treatment with various penicillin preparations in some cases, we decided to study the seric penicillin concentrations in the patients hospitalized in the "V. Babes" Hospital of Infectious Diseases, after administration of the various Romanian made forms of penicillin currently used in the therapy of streptococcal infections and in the prophylaxis of the sequelae of these infections. The data obtained on groups exceeding 30 persons by using two methods of determining the penicillin concentrations the dilutions and the diffusimetric methods revealed protective penicillin seric levels satisfactory for penicillin G and Efitard, according to the present treatment schemes. After 5 days from Moldamin administration only 45.4% of children and 43.3% of adults were found to have satisfactory penicillin concentrations. The administration of penicillin V reaches active penicillin concentrations in terms of the dose administered. The paper points out only one of the causes which together with others (such as beta-lactamase production and tolerance), contribute to the unsuccessful treatment with various forms of penicillin.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1297463&dopt=Abstract
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