Magnetic microspheres of tamarind gum and chitosan were
studied. The magnetic microspheres were prepared by
suspension cross-linking technique. Microspheres formed
were in the size range of 230 - 460 μm.The magnetic material
used in the preparation of the microspheres was prepared by
precipitation from FeCl and FeSO solutionsin basic medium
In another study Diclofenac sodium matrix tablets containing
TSP was investigated. The tablets prepared by wet granulation technique were evaluated for its drug release
characteristics. The result of this study demonstrated, that
isolated TSP can be used as a drug release retardant. It was
observed that the swelling index increased with the increase
in concentration of TSP. Increase in polymer content resulted
in a decrease in drug release from the tablets. The drug release
was extended over a period of 12 hrs. and followed zero order
kinetics .
TSP was also examined for its sustained release property
using both water soluble (acetaminophen, caffeine,
theophylline and salicylic acid) and water insoluble drugs
(indomethacin) . The release rates from the TPS matrix
tablets were found to be dependent on the drug solubility.
Zero order release was achieved for indomethacin from TSP.
Mucoadhesive buccal patches using tamarind gum as
mucoadhesive polymer for controlled release of
benzydamine (BNZ) and lidocaine (LDC) were prepared and
evaluated . A LDC-tannic acid complex was also prepared
and tested. The patches, prepared by compressing appropriate
mixtures containing the drug salts/complexes, lactose and
tamarind gum, were tested in vitro for mucoadhesion and drug
release, and in vivo on human volunteers for retention and
release of BNZ. The devices containing the salts of BNZ with
pectin and polyacrylic acid, and the complex of LDC with
tannic acid showed zero-order release kinetics in vitro. The
patches adhered for over 8 h to the upper gums of the
volunteers, and were perfectly tolerated. BNZ hydrochloride
was released in vivo and in vitro with practically identical
profiles.