2-Keto-3-(p-hydroxyphenyl)-6-methyl-pyrazin, ein Abbauprodukt des Amoxicillins

Wärmeleitfähigkeit halbfester pharmazeutischer Hilfsstoffe und Formulierungen

o-Ethoxybenzamid-Mannichbasen als potentielle Prodrugs. o-Ethoxybenzamide Mannich Bases as Potential Prodrugs

Wechselwirkungen zwischen Acetylsalicylsäure und Lysin in Lösung

Der pH-abhangige Einflus von Lysin auf die Hydrolyse von Acetylsalicylsaure zu Salicylsaure und auf die Bildung von Lysinderivaten der Acetylsalicylsaure wurde durch HPLC-Untersuchungen geklart. Die Bildung von e-N-Acetyl-lysin, α-N-Acetyl-lysin und wenig Diacetyl-lysin erfolgt rasch bei pH-Werten der Losung von 6 und hoher, sehr langsam jedoch bei dem fur gebrauchliche Injektionslosungen eingestellten pH-Wert 5. Das Auftreten des postulierten Salicyloyllysins in Acetylsalicylsaure-Lysin-Losungen wurde durch Vergleich mit der unabhangig synthetisierten Verbindung ausgeschlossen. Interactions of Acetylsalicyclic Acid and Lysine in Solution The influence of lysine on the hydrolysis, and on th…

Biodegradable microtablets made of low molecular weight polyglycolic acid: Bioabbaubare Mikrotabletten aus niedermolekularer Polyglycolsäure

Research work in developing pharmaceutical dosage forms with biodegradable polymers seldom dealt with polyglycolic acid (PGA)1,2. This because of difficult processing procedures and low solubility of PGA in common organic solvents2,3. The only licensed product of the homoplymer in medical use is the sufgical suture Dexon®4

Iontophoretic in Vitro Release of Antimycotics from Hydrogels

A new in vitro model for iontophoretic release from hydrogels was developed. It represents a modification of the rotary disk cell developed by Moll/Bender and can be used in a normal dissolution tester. The iontophoretic release from antimycotic hydrogels through an artificial membrane was investigated and different types of antimycotics were tested. The influence of current density, drug concentration and vehicle was determined.

Einfluß sterischer Hinderung auf den Abbau von Ciclacillin und Ampicillin

Kinetische Untersuchungen der Reaktivitat von Aminopenicillinen belegen bei Ciclacillin eine sterische Hinderung der α-Aminogruppe der Phenylacetamido-Seitenkette. Vergleichende Haltbarkeitsuntersuchungen an Arzneizubereitungen von Ciclacillin und Ampicillin ergaben, das die aus der sterischen Hinderung resultierende hohere Stabilitat von Ciclacillin auch bei Injektions-Losungen, Suspensionen sowie eingeschrankt bei Pulvern und Tabletten nachweisbar ist. Influence of Steric Hindrance on the Degradation of Ciclacillin and Ampicillin Kinetic measurements of the reactivity of aminopenicillins demonstrated steric hindrance of the side chain amino group of ciclacillin. Comparative stability meas…

Biodegradable tablets having a matrix of low molecular weight poly-L-lactic acid and poly-D,L-lactic acid.

Biodegradable Homo- and Copolymers of lactic and glycolic acids have been used for manufacture of microparticles and matrix implants1,5). To ensure sufficient hydrolytic matrix stability lactic acids of high and medium degree of polymerization have been used. The manufacture of poly lactic acid tablets with an average molecular weight of 25000 and 6000 was reported recently, after finishing the following study2). Bioabbaubare Gerusttabletten aus niedermolekularer poly-L-Milchsaure und poly-D,L-Milchsaure

Antibiotic in vivo/in vitro release, histocompatibility and biodegradation of gentamicin implants based on lactic acid polymers and copolymers

Abstract Biodegradable implants containing 10 mg of gentamicin each were prepared by compressing the polymer-drug mixture. The liberation of gentamicin from the implants and the biodegradation of the implants were investigated by following in vitro and in vivo experiments. Implants based on pure poly( l -lactic acid) (L-PLA) released the incorporated antibiotic throughout 30 days with a decreasing delivery rate. During the first 24 h L-PLA implants released a total amount of 3600 μg gentamicin. Within 14 days the release rate had decreased to about 12 μg/day. The release profile of implants based on dl -lactic acid-glycolic acid copolymer (RG 502) was completely different. About 1900 μg wer…

Controlled iontophoretic release of glucocorticoids through epithelial cell monolayers

In the present study the iontophoretic transdermal delivery of three different glucocorticoids through a confluent monolayer of MDCK cells, mimicking biological barriers, was studied. For this experiment an in vitro model with platinum electrodes for iontophoresis and MDCK cells was developed. With this model investigations concerning the biocompatibility of the cells depending on different current densities and the iontophoretic permeation of the three glucocorticoids through the cell monolayer were carried out. The permeation behavior of this living biological barrier should be very similar to the non-living barrier, human stratum corneum. Different current densities (12.74-38.22 microA/c…

Quantitative Bestimmung von Gelatine in Arzneizubereitungen durch HPLC mit fluorimetrischer Detektion

Gelatine ist als pharmazeutischer Hilfsstoff fur Kapseln, Gele, Globuli und Tabletten sowie als Lebensmittelzusatzstoff unverandert wichtig. Aus Proteinen hoher Molekularmasse1 bestehend, ist Gelatine spezifischen quantitativen Bestimmungen relativ schwer zuganglich2-6.

Postersitzung 13: Inkontinenz — Harnabflußstörungen

Den guten Fruhresultaten von 80–90% stehen masige Langzeiterfolgsquoten von 50–70% nach 5 Jahren bei den bekannten urethralen Suspensionsmethoden entgegen. Aus der Schlusfolgerung, das primar befriedigende funktionelle Verhaltnisse vorliegen, ergibt sich der Ansatz, durch Optimierung bereits bestehender Verfahren bessere Langzeitergebnisse anzustreben.

Erratum to “Choices of Stent and Cerebral Protection in the Ongoing ACST-2 Trial: A Descriptive Study” (European Journal of Vascular and Endovascular Surgery (2017) 53(5) (617–625) (S1078588417300424) (10.1016/j.ejvs.2016.12.034))

Due to a miscommunication during the production of this article, the members of the ACST-2 Collaborative Group were not properly indexed in PubMed. This has now been corrected online. We apologize for any confusion or inconvenience that this oversight might have caused.

In vitro pulsatile and continuous transdermal delivery of buserelin by iontophoresis

Abstract Transdermal delivery of buserelin, a nonapeptide, from hydroxyethylcellulose hydrogel through isolated human stratum comeum was studied. In vitro studies were carried out in a drug release apparatus (DAB 10/USP XII) using self designed rotary disk cells equipped with platinum electrodes. Different forms of current were examined. A pulsatile application of continuous current resulted in a step-like permeation profile. Different on/off ratios (5 min/55 min; 10 min/50 min; 15 min/45 min)) were studied. When continuous non-interrupted current with different current densities (0.1–0.3 mA·cm −2 ) was applied, linear dependence of the final cumulative amount of buserelin on current durati…