Purpose. To identify hydrotropic agents that can increase aqueous paclitaxel (PTX) solubility and to study the chemical structures necessary for hydrotropic properties so that polymeric hydrotropic agents can be synthesized.Methods. More than 60 candidate hydrotropic agents (or hydrotropes) were tested for their ability to increase the aqueous PTX solubility. A number of nicotinamide analogues were synthesized based on the observation that nicotinamide showed a favorable hydrotropic property. The identified hydrotropes for PTX were used to examine the structure-activity relationship.Results. N,N-Diethylnicotinamide (NNDENA) was found to be the most effective hydrotropic agent for PTX. The aqueous PTX solubility was 39 mg/ml and 512 mg/ml at NNDENA concentrations of 3.5 M and 5.95 M, respectively. These values are 5-6 orders of magnitude greater than the intrinsic solubility of 0.30+/-0.02 mug/ml. N-Picolylnicotinamide, N-allylnicotinamide, and sodium salicylate were also excellent hydrotropes for PTX. Solubility data showed that an effective hydrotropic agent should be highly water soluble while maintaining a hydrophobic segment.Conclusions. The present study identified several hydrotropic agents effective for increasing aqueous solubility of PTX and analyzed the structural requirements for this hydrotropic property. This information can be used to find other hydrotropic compounds and to synthesize polymeric hydrotropes that are effective for PTX and other poorly water-soluble drugs.
Novel pyridones and their use as modulators of serine hydrolase enzymes
申请人:Dalhousie University
公开号:US20020049330A1
公开(公告)日:2002-04-25
This invention relates to a compound of formula I:
1
or a pharmaceutically acceptable salt thereof;
in which preferably R
3
, R
4
and R
6
are each hydrogen;
X is C═O or CH
2
; and
R
7
and R
8
are each independently selected from the group consisting of hydrogen, (C
1
-C
12
)alkyl, (C
3
-C
8
)cycloalkyl and (C
1
-C
2
)alkyl(C
6
-C
14
)aryl; or
R
7
and R
8
when taken together form a (C
2
-C
7
)alkylene group; or
—NR
7
R
8
together forms a (C
2
-C
14
)heterocyclic or substituted (C
2
-C
14
)heterocyclic. Such compounds modulate the activity of serine hydrolases and can be used in pharmaceutical compositions for the treatment of Alzheimer's disease.
EXPANSIBLE BIOCOMPATIBLE COATS COMPRISING A BIOLOGICALLY ACTIVE SUBSTANCE
申请人:Avidal Vascular Gmbh
公开号:EP2271396A2
公开(公告)日:2011-01-12
Expansible Biocompatible Coats Comprising a Biologically Active Substance
申请人:Heilmann Torsten
公开号:US20110046724A1
公开(公告)日:2011-02-24
The present invention relates to an expansible hollow part, having at least one opening, which consists of an elastic biocompatible material and which comprises at least one biologically active substance and, optionally at least one matrix compound. The invention also provides a method of producing said expansible hollow part, a medical device covered at least partially with said hollow part, a kit-of-parts comprising said hollow part of the invention and the use of said hollow part as a therapeutic device and for protecting a medical device.