Abstract
Background: The use of synthetic and semi-synthetic materials in drug delivery systems has associated drawbacks like costly synthesis, toxicity, and biocompatibility issues. Therefore, there is a need to introduce novel materials to overcome such issues. Naturally occurring and water-swellable polysaccharides are advantageous in overcoming the above-mentioned issues. Therefore, we are reporting a novel hydrogel (SSH) isolated from the seeds of Salvia spinosa as a sustained release material.
Methods: SSH was explored for its pH-dependent and salt-responsive swelling before and after compression in a tablet form. Stimuli-responsive swelling and deswelling were also monitored at pH 7.4 and pH 1.2 in deionized water (DW) and normal saline and DW and ethanol. The sustained-release potential of SSH-based tablets was monitored at gastrointestinal tract (GIT) pH. The transit of SSH tablets was ascertained through an X-ray study.
Results: The swelling of SSH in powder and tablet form was found in the order of DW > pH 7.4 > pH 6.8 > pH 1.2. An inverse relation was found between the swelling of SSH and the concentration of the salt solution. The SSH showed stimuli-responsive swelling and de-swelling before and after compression, indicating the unaltered nature of SSH even in a closely packed form, i.e., tablets. Sustained release of theophylline (< 80%) was witnessed at pH 6.8 and 7.4 during the 12 h study following zeroorder kinetics, and radiographic images also showed 9 h retention in GIT.
Conclusion: These investigations showed the potential of SSH as a pH-sensitive material for sustained and targeted drug delivery.
Keywords: Polysaccharides, stimuli-responsiveness, pH-sensitivity, sustained release, smart hydrogel, Kanocha mucilage, Salvia spinosa hydrogel.
Graphical Abstract
[http://dx.doi.org/10.1021/acs.chemrev.6b00225] [PMID: 27459699]
[http://dx.doi.org/10.1039/C5GC01403D]
[http://dx.doi.org/10.1007/s13197-014-1396-5] [PMID: 25892752]
[http://dx.doi.org/10.2174/1389450118666170123145357] [PMID: 28117001]
[http://dx.doi.org/10.1080/15583724.2015.1078351]
[http://dx.doi.org/10.2174/1389450118666170704143018] [PMID: 28676001]
[http://dx.doi.org/10.2174/1381612821666150109144613] [PMID: 25578889]
[http://dx.doi.org/10.1016/j.carbpol.2017.12.009] [PMID: 29352896]
[http://dx.doi.org/10.1016/j.indcrop.2020.112780]
[http://dx.doi.org/10.1007/s13197-010-0162-6] [PMID: 23572691]
[http://dx.doi.org/10.2174/0929867326666191122144916] [PMID: 31755377]
[http://dx.doi.org/10.2174/0929867327666200408115817] [PMID: 32268859]
[http://dx.doi.org/10.1016/j.jddst.2019.101470]
[http://dx.doi.org/10.1016/j.biopha.2018.07.136] [PMID: 30086465]
[http://dx.doi.org/10.1002/app.48454]
[http://dx.doi.org/10.1016/j.carbpol.2015.09.092] [PMID: 26572409]
[http://dx.doi.org/10.1016/j.mex.2019.100779] [PMID: 31993340]
[http://dx.doi.org/10.3390/polym10020112] [PMID: 30966148]
[http://dx.doi.org/10.1016/j.jddst.2020.101795]
[http://dx.doi.org/10.1080/03639045.2016.1257017] [PMID: 27808567]
[http://dx.doi.org/10.1016/j.jddst.2018.04.008]
[http://dx.doi.org/10.3109/10717544.2013.834416] [PMID: 24032629]
[http://dx.doi.org/10.3390/polym9040137] [PMID: 30970818]
[http://dx.doi.org/10.1039/D1RA02219A]
[http://dx.doi.org/10.1039/C5RA23088H]
[http://dx.doi.org/10.1016/j.ijbiomac.2018.12.242] [PMID: 30594626]
[http://dx.doi.org/10.1016/j.eurpolymj.2018.10.033]
[http://dx.doi.org/10.1080/03639040701377292] [PMID: 17882730]