Mimosa scabrella:
Highly hydrophilic galactomannan is obtained from the seeds
of Mimosa scabrella (a brazilian leguminous tree called
bracatinga) of the Mimosaceae family. Its seeds provided
20–30% of galactomannan (G) with a mannose: galactose
ratio of 1.1:1. The galactomannan was obtained by first
milling the seeds of M. scabrella followed by boiling in water
for 10 min and then extracting from the aqueous phase for 4 h
0 under mechanical stirring at 30 C. The dispersion was filtered
and the filtrate was precipitated with ethanol 50% (v/v). The
precipitate was washed in a gradient of ethanol (70–100%
74 v/v) and dried .
In an independent study directly compressed theophylline
tablets, containing commercial xanthan (X) (Keltrol®) and a
highly hydrophilic galactomannan (G) from the seeds of
Mimosa scabrella as release-controlling agents, was studied.
Gums were used at 4, 8, 12.5 and 25% (w/w), either alone or in
mixture (X:G 1:1). The G obtained by different methods was
vacuum oven dried (VO) or spray dried (SD), which were
then evaluated for their in vitro drug release. The pH of the
dissolution medium (1.4) was changed to 4.0 and 6.8 after 2
and 3 h, respectively. Tablets containing G (SD) resulted in
more uniform drug release than G (VO) ones, due to their smaller particle size. As the polymer concentration was
increased the drug release decreased and all formulations at
25% w/w of gums showed excessive sustained release effect.
The matrices made with alone X showed higher drug
retention for all concentrations, compared with G matrices
that released the drug too fast. The XG matrices were able to
produce near zero-order drug release. The XG (SD) 8% of
tablets provided the required release rate (about 90% at the
74 end of 8 h), with zero-order release kinetics .
Mimosa scabrella:
Highly hydrophilic galactomannan is obtained from the seeds
of Mimosa scabrella (a brazilian leguminous tree called
bracatinga) of the Mimosaceae family. Its seeds provided
20–30% of galactomannan (G) with a mannose: galactose
ratio of 1.1:1. The galactomannan was obtained by first
milling the seeds of M. scabrella followed by boiling in water
for 10 min and then extracting from the aqueous phase for 4 h
0 under mechanical stirring at 30 C. The dispersion was filtered
and the filtrate was precipitated with ethanol 50% (v/v). The
precipitate was washed in a gradient of ethanol (70–100%
74 v/v) and dried .
In an independent study directly compressed theophylline
tablets, containing commercial xanthan (X) (Keltrol®) and a
highly hydrophilic galactomannan (G) from the seeds of
Mimosa scabrella as release-controlling agents, was studied.
Gums were used at 4, 8, 12.5 and 25% (w/w), either alone or in
mixture (X:G 1:1). The G obtained by different methods was
vacuum oven dried (VO) or spray dried (SD), which were
then evaluated for their in vitro drug release. The pH of the
dissolution medium (1.4) was changed to 4.0 and 6.8 after 2
and 3 h, respectively. Tablets containing G (SD) resulted in
more uniform drug release than G (VO) ones, due to their smaller particle size. As the polymer concentration was
increased the drug release decreased and all formulations at
25% w/w of gums showed excessive sustained release effect.
The matrices made with alone X showed higher drug
retention for all concentrations, compared with G matrices
that released the drug too fast. The XG matrices were able to
produce near zero-order drug release. The XG (SD) 8% of
tablets provided the required release rate (about 90% at the
74 end of 8 h), with zero-order release kinetics .
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