Research Article - (2022) Volume 13, Issue 1

Nanosponges as Emerging Carriers for Drug Delivery

Shiwangi Singh* and Monika K
 
*Correspondence: Shiwangi Singh, Department of Pharmacy, Noida Institute of Engineering and Technology, Greater Noida, India, Email:

Author info »

Abstract

Objective: The recent advancement in nanotechnology has led nanosponges to emerge as a suitable carrier for the delivery of both hydrophilic and lipophilic drugs. These are the tiny sponges that circulate throughout the body to achieve the desired dose of a drug in the specific organ of human bodies in a carefully controlled manner. They have higher drug loading capabilities as compared to other nanocarriers.

Methods: Nanosponges can also serve as a potent transporter for enzymes, proteins, and antibodies. This review attempts to elaborate on nanosponge’s merits and demerits, mechanism, composition, preparation, characterization, and their potential applications as delivery systems.

Conclusion: Nanosponges are a novel class of drug delivery systems as they treat both hydrophilic and hydrophobic drugs by forming inclusion and non-inclusion complexes. This nano technology provides beneficial effects that improve stability, reduce side effects and improve flexibility.

Keywords

Nanosponges, Hydrophilic and lipophilic medications, Gastro-retentive drug delivery system (GRDDS)

Introduction

Nanosponges, as the name suggests, lies in the modern category of drug carriers which comprises of minute particles with a diameter ranging up to a few nanometers. These minute particles work well with both hydrophilic and lipophilic drug substances. They can help in expanding the safety of poorly water-soluble drug substance or particles (Bolmal UB, et al., 2013). Nanosponges are tiny sponges as shown in Figure 1 that can travel around the body to pass a specific site and then join to target site to release the drug in a controlled and predictable manner. Nanosponge is water-soluble. This doesn’t mean the particles of the drug disintegrate in water but it means that nanosponge particles can combine with water and work it as a transport fluid, for example, to be inserted. Most other forms of nanoparticle delivery systems must be using several chemical transports, but they have lesser effects. The efficacy of nanosponge depends on its particle size. Earlier the particle size is predicted to be in the range of 150-400 nm, but most recently, the researchers have improved nanosponge with a particle size of 50 nm (Dhanalakshmi S, et al., 2020). Initially, the nanosponge drug delivery system was developed only as a topical delivery system, but by the 21st century, nanosponges could be administered orally as well as by intravenous route (Yadav GV and Panchory HP, 2013). The most common route of administration for systemic action is oral route. It is possible that at least 90% of all the drugs can be given by oral route (Streubel A, et al., 2006). Dosage forms that can be maintained in the stomach for longer duration are called GRDDS. GRDDS can enhance the controlled delivery of drugs that have an absorption chance by continuously releasing the drug for an extended period of time before it passes its absorption site (Sowmya B, et al., 2019). Drugs that are already absorbed into the gastrointestinal tract and those that have a short life span are quickly removed from the circulatory system because of the need for regular dosing. To control this problem, drug delivery systems that provide long-term plasma drug exposure thereby reduce the frequency of dosage. Gastroretentive drug delivery systems improve duration of dosing and therefore improve patient compliance. The presence of the drug in the form of a solution is essential for the drug to enter. However, if the dissolution of the drug is not correct, the time required for the drug to be excreted inside the stomach will be greater and the time to travel becomes more critical, which may affect the absorption of the drug. Therefore, the dose of the administration of such drugs should be kept periodically (Garg S and Sharma S, 2003).

nanosponges

Figure 1: Scanning electron microscopy of nanosponges

Merits of nanosponges

• Increase the aqueous solubility of the poorly water-soluble drug

• They have the ability to produce a predictable/controlled drug manner

• They are non-irritating and non-toxic in nature

• Reduce dosing frequency

• Better patient compliance (Thakre AR, et al., 2016; Ahmed RZ, et al., 2013). Demerits of nanosponges

• The main disadvantage of these nanosponges is their ability to include only small molecules

• Depend just on loading limits (Trotta F, et al., 2012).

Mechanism of drug release from nanosponges

Nanosponges constitute three-dimensional structure of cross-linking polymer. The entrapment efficiency and solubilizing efficiency of nanosponges can be changed according to how much cross-linking polymer is being added to formulation. The toroidal shape of nanosponges allows them to have a cavity inside the structure which can fit various types of drug molecules. This because of such type of structure they can act as carriers for various types of drugs drug carriers, as long as the active compound is having compatibility with geometry and polarity of cavity the drug will release at target site. To find out when these active compounds will be delivered, the structure of nanosponge plays a crucial role which can be modified to depending on requirement of drug release. Several ligands or carriers can also be attached on to the surface of the nanosponge to target the molecules to various sites in body (Sadhasivam J, et al., 2020) (Table 1).

S. No Composition of nanosponges Example Reference
1. Polymer Β-cyclodextrine (Gharakhloo M, et al., 2020; Haimhoffer Á, et al., 2019)
2-hydroxypropyl- Methyl- β- cyclodextrine
Methyl-β-cyclodextrine
β-cyclodextrine
Hyper crosslinked polystyrene (Davankov VA, 1997)
Ethyl cellulose (Penjuri SC, et al., 2016)
Polyvinyl alcohol (Abbas N, et al., 2018)
2. Crosslinker Diphenyl carbonate (Omar SM, et al., 2020)
Carbonyldiimidazole (Deshmukh K, et al., 2016)
Pyromellitic anhydride (Rafati N, et al., 2019)
Diisocyanates (Bachkar BA, et al., 2015)

Table 1: Composition of nanosponges

Role of polymer and cross-linker

The choice of polymer can influence the composition along with the formation of nanosponges. They should have a property to bind with the specific ligands and the selection of cross-linking agent can be depending upon the polymer structure as well as the drug which is formulated.

Materials and Methods

Nanosponges prepared from hyper-cross linked β-cyclodextrins

β-cyclodextrin nanosponges are prepared by using cross-linker in a round bottom flask with the polymer which are added and shaken to complete the dissolution. Afterwards, cross-linker is added and the solution is allowed for 4 hours at 1000°C. When polymerization is complete, add some de-ionised water to remove the cross-linking agent. Finally, the rest of the products are removed by Soxhlet extraction by ethanol. Then, the product is dried at 600°C in oven (Lala R, et al., 2011).

Ultrasound-assisted synthesis

Nanosponges were obtained by converting polymers through crosslinkers when there was no solvent under sonication. In this way the nanosponges are obtained and will be circular and uniform in size. Di-phenyl carbonate or pyromellitic anhydride was used as a cross-linker. The amount of cyclodextrin anhydrous was added to di-phenyl carbonate at 90°C where the mixture was formed for five hours. Then, the product was filled in mortar and purified with Soxhlet extract with ethanol to remove impurities. The product was obtained and stored at 25°C until further use (Shivani S and Poladi KK, 2015).

Emulsion-solvent diffusion method

Nanosponges can be prepared by using different amount of co-polymer. The dispersed phase containing co-polymer and the drug is dissolved in cross-linker and then slightly added co-polymer in aqueous phase. Then, the reaction mixture is stirred at 1000 rpm for 2 hrs in magnetic stirrer. The nanosponges formed and dried in hot air oven at 40°C for 24 hrs. The dried nanosponges are stored in vacuum desiccators for the removal of residual solvents (Bolmal UB, et al., 2013).

Results and Discussion

Quasi-emulsion solvent diffusion

This phase is prepared by using the co-polymer and added to a suitable solvent. Drug is also included and dissolved under ultrasonication at 35°C. Then, the polymer is added which acts as emulsifying agent. The mixture is stirred for 3 hours at 1000-2000 rpm and dried in hot air oven for 12 hours at 40°C (Selvamuthukumar S, et al., 2012).

Loading of drug into nanosponges

In this method the nanosponges are first treated to obtain particle size less than 500 nm. Nanosponges are suspended in water and sonicated to avoid the presence of aggregates and after that the suspension is centrifuged to obtain a colloidal fraction. The liquid is separated and dried the sample through a freeze-drying process (Selvamuthukumar S, et al., 2012). The aqueous suspension of nanosponge is prepared and dispersed the large amount of the drug and the suspension is maintained at constant stirring for specific time required for complexation. After complexation, the undissolved drug separated from the dissolved drug by the process of centrifugation. Then solid crystals are obtained by the solvent evaporation or by freeze drying method (Swaminathan S, et al., 2010; Bolmal UB, et al., 2013).

Characterization and evaluation of nanosponges

Microscopy studies: Scanning electron microscopy and transmission electron microscopy can be used to analyze the morphology and further geology of nanosponges. Crystallization state of the crude material and the product detected under electron microscopy which shows the formation of embedded structures (Challa R, et al., 2005; Bolmal UB, et al., 2013).

Particle size and polydispersity: It can be determined by the Dynamic Light Scattering Instrument (DLSI) process equipped with particle sizing software. With this process the width of the index and the Poly-Dispersity Index (PDI) can also be determined. PDI is the measure of the width or variation within the distribution of particle size. The low PDI value consists of monodisperse samples, while the high PDI value indicates the wide particle size distribution and polydisperse nature of the sample. It can be calculated by the following equation-

PDI=Δd/davg

Where, Δd is the width of distribution and davg is the average particle size (nm) in particle size (Moura FC and Lago RM, 2009).

Thin layer chromatography: In thin layer chromatography, the Rf value of a drug substance decrease to a considerable range. It also helps in determining the formation of complex between the nanosponges and the drugs (Patel Ek and Oswal RJ, 2012).

Loading efficiency: It can be determined by the limited dose of the drug loaded into nanosponges by the process of UV spectrophotometer and High-performance liquid chromatography. The efficiency of nanosponges can be calculated by the following equation.

Loading efficiency=Amount of drug loaded in nanosponge/Theoretical drug loaded × 100 (Singh R, et al., 2010).

Solubility studies: The effect of nanosponges and solubility of drug was analysed by a complex model of phase solubility method described by Higuchi Connors (Osmani RA, et al., 2019; Shivani S and Poladi KK, 2015). These studies evaluate drugs pH solubilisation profile within the complex structure of nanosponges (Shringirishi M, et al., 2014).

Thermo-analytical methods: It determines whether the drug undergoes certain changes before the thermal degradation of the nanosponge. The process of drug substance can melt, evaporate, decompose or change polymorphic. Drug modification shows a complex structure. According to the thermo-analytical technique, a thermogram obtained by differential thermal analysis and differential scanning calorimetry can be detected to increase, shift and appearance of new peaks or disappearance of any peaks (Maravajhala V, et al., 2012) (Table 2).

S. No Author name Drug used Nanosponge ingredients Result outcomes Ref. No.
1 Kiran Deshmukh et al. Biomed Pharmacoether. 2016 Dec. Antibacterial and Antihypocalcemic drugs β-Cyclodextrin Nanosponges The result was concluded as a promising anti-bacterial protein transporter and to prevent calcium depletion in the case of antibiotic hypercalcaemic. (Singh P, et al., 2018)
2 Parbeen Singh et al. Carbohydr Polym. 2018 Doxorubicin Cyclodextrin nanosponges Cellular uptake of nanosponges was detected and improved after the conversion of cholesterol hydrogen succinate (CHS). (Hayiyana Z, et al., 2016)
3 Zikhona Hayiyana et al. Curr Pharm Des. 2016 Ocular drugs Hydrophilic cyclodextrin based nanosponges The result was studied to improve corneal penetration and drug solubility. (Chen Y, et al., 2019)
4 Yijie Chen et al. ACS Nano. 2019 Organophosphates Cloaked oil nanosponges Oil nanosponges serves as a prototype of multimodal detoxification compound has been studied. (Ye H, et al., 2020)
6 Hao Ye et al. Biomaterials. 2020 Doxorubicin and Indocyanine green Exosomes NSK (nanosponges and nanokillers) can be a promising nanomedicine for future clinical interventions for metastasis breast cancer. (Kumar S, et al., 2018)
7 Sunil Kumar et al. Pharmaceutics. 2018 Antibacterial, Antifungal, Antioxidant, Anti-inflammatory, Immunomodulatory and Antitumor elements. Cyclodextrin nanosponges The installation of Babchi oil oil in nanosponges was bought with an active transporter frame until solvency, image stability, and its oil life alongside the benefits. (Kamble M, et al., 2019)
9 Monica R P Rao et al. AAPS PharmSciTech. 2018 Rilpivirine Cyclodextrin-nanosponges The result examines uncovered conceivable method of capture of rilpivirine inside β-CD space. (Rao MR, et al., 2018)
10 Hongwang Wang et al. Nanomedicine. 2017 Anticancer drugs Peptide nanosponge The composition of novel nanosponges was examined clear dissolvable and subsequent atomic (MD) re-engineering. (Wang H, et al., 2017)
11 Qingli Huang et al. Spectrochim Acta A Mol Biomol Spectrosc. 2018 Pazufloxacin mesylate Ag nanosponges Pazufloxacin mesilate (PM) were recognized helpfully utilizing these uniform nanosponges as SERS substrates. (Huang Q, et al., 2018)
12 Maria Tannous et al. Methods Mol Bio. 2021 Antibacterial, anticancer, antiviral drugs Cyclodextrin nanosponges cyclodextrin nanosponges" (CDNSs), pull in incredible consideration from scientists for tackling significant bioavailability issues, for example, deficient solvency, poor disintegration rate, and limited strength of certain specialists, just as expanding their viability and diminishing undesirable results. (Tannous M, et al., 2021)
13 Diego F Suarez et al. J Photochem Photobiol B. 2017 Dec. Doxycycline and Zno nanoparticles Antibacterial nanosponges The result was showed that ZnO-NPs filled with DOX have productive UV photocatalytic action against bacterial delicate decay contaminations. (Suárez DF, et al., 2017)
14 Phillip S Coburn et al. mSphere. 2019 Intraocular drugs biomimetic erythrocyte-derived nanosponge Biomimetic nanosponges kill pore-framing poisons from these visual microbes and help in saving retinal capacity. (Coburn PS, et al., 2019)
15 Yijie Chen et al. Small. 2019 Feb. Antibacterial drugs Biomimetic nanosponges The results provide a systematic review of RBC-NS (red blood cells nanosponges) for the treatment of severe MRSA infections (methicillin-resistant Staphylococcus aureus) such as MRSA bacteremia and MRSA-induced sepsis. (Chen Y, et al., 2019)
16 Ute Distler et al. ACS Nano. 2017. Antibacterial drugs Biomimetic nanosponges It has been shown that nanosponges coated with a membrane in combination with many proteinomic substances can also be used as effective "fishing aids" for the detection of hazardous substances specific to a particular cell type. (Distler U and Tenzer S, 2017)
17 Monica Argenziano et al. Oncotarget. 2018 Anticancer drugs Glutathione/pH-responsive nanosponges It shows that GSH/pH-NS are a proficient instrument for the controlled transfer of SLs to increase critical starvation and may increase the therapeutic efficacy of these compounds. (Argenziano M, et al., 2018)
18 Yue Zhang et al. ACS Nano.2017 Antibacterial drugs Colloidal gel nanosponge The nanosponge colloidal gel framework is promising as an injectable application for correction applications for example, antivirulence treatment that is close to viral infections. (Zhang Y, et al., 2017)
19 Nilesh Kumar Dhakar et al. Pharmaceutics. 2019 Resveratrol and Oxyresveratrol β-cyclodextrin nanosponges The high solubilization of nanosponges filled with resveratrol- and oxyresveratrol leads to a higher cell-reinforcing action compared to drug particles alone. (Dhakar NK, et al., 2019)
20 Antonella Di Vincenzo et al. Beilstein J Org Chem. 2019. Polyamionazides mixtures Calixarene based nanosponges The ideal responsivity to pH varieties of the nanosponges acquired was confirmed by methods for ingestion tests on a bunch of natural toxin model particles. (Di Vincenzo A, et al., 2019)
21 Nausicaa Clemente et al. Front Pharmacol. 2019 Paclitaxel Pyromellitic nanosponges It showed that our new PTX (paclitaxel) nanoformulation can react to significant issues identified with paclitaxel treatment, bringing down the counter tumour successful dosages and expanding the adequacy in hindering melanoma development in vivo. (Clemente N, et al., 2019)
22 Jing Wang et al. ACS Nano. 2019 Anticancer drugs DNA zyme nanosponges The present DNA zyme NS framework could be designed with more remedial arrangements and specialists and was foreseen to show remarkable guarantee and adaptability for applications in biomedicine and bioengineering. (Wang J, et al., 2019)
23 Yijie Chen et al. Adv Healthc Mater. 2018 Jul. Antibacterial drugs Biomimetic nanosponges It demonstrates the wide range of efficacy and high performance of hRBC nanosponges (red blood cells) as a novel anti-haemolytic drug platform from various types of viruses. (Chen Y, et al., 2018)
24 Atul P Sherje et al. J Mater Sci Med. 2019. Paliperidone β-cyclodextrin based nanosponges Cyclodextrin-based nanosponges talk about a novel way of developing solvency and improving the dispersion of selected PLP (paliperidone) drugs. (Sherje AP, et al., 2019)
25 Monica Ferro et al. Beilstein J Org Chem. 2017 Ibuprofen Cyclodextrin nanosponges It obtained from different NMR solid state models incorporates data from powder X-beam diffraction profiles. (Ferro M, et al., 2017)
26 F Caldera et al. Carbohydr Polym. 2018. Doxorubicin Cyclic nigerosyl-1-6-nigerose (CNN) nanosponges CNN-nanosponges may promise biocompatible nanocarriers for supported delivery of doxorubicin and anticipated inhibitory system in malignancy medicines. (Caldera F, et al., 2018)
27 Francesco Trotta et al. Chempluschem. 2016 May. Doxorubicin β-cyclodextrin nanosponges The cleavage of di-sulfide bridges allows the targeted release of cancer-fighting drugs into glutathione-rich cells that resist cells. (Trotta F, et al., 2016)
28 Monica R P Rao et al. AAPS PharmSciTech. 2017 Jul. Efavirenz β-cyclodextrin nanosponges Nanosponge properties have been found to have twice the oral administration of efavirenz compared to simple drugs. (Rao MR and Shirsath C, 2017)
29 Michael Appell et al. Toxins (Basel). 2012 Feb. Ochratoxin A β-cyclodextrin-polyurethane polymer These results suggest cyclodextrin nanosponge materials are suitable to reduce levels of ochratoxin A from spiked aqueous solutions and red wine samples. (Appell M and Jackson MA, 2012)
30 Ilaria Simionato et al. Food Chem Toxicol. 2019 Oct. Antimicrobial drug Cyclodextrin nanosponges The results described herein encourage the use of cyclodextrin nanosponges as encapsulating agents for active food packaging applications. (Simionato I, et al., 2019)
31 Yacine Nait Bachir et al. Drug Dev Ind Pharm. 2019 Feb. Salvia Officinalis essential oil β-cyclodextrin nanosponges Salvia officinalis is a basic nanoemulsion oil based on β-cyclodextrin-naphthalene dicarboxylic nanosponges that bring the highest potency and promising use in the drug industry. (Nait Bachir Y, et al., 2019)
32 Francesco Trotta et al. Expert Opin Drug Deliv. 2016 Dec. L-Dopa Cyclodextrin nanosponges MIP-NS exhibits a prolonged released profile that is slower and longer than non-labeled nanosponges. No L-DOPA-induced degradation in MIP-NS was observed after prolonged storage at room temperature. (Trotta F, et al., 2016)
33 Pravin K Shende et al. Colloids Surf B Biointerfaces. 2015. Meloxicam β-cyclodextrin-based nanosponges Nanosponges based on β-cyclodextrin talk about a novel approach to the controlled arrival of meloxicam to detect and reduce effects. (Shende PK, et al., 2015)
34 Mohamed F Zidan et al. Drug Dev Ind Pharm. 2018 Aug. Atorvastatin calcium Cyclodextrin nanosponges It has been confirmed that AC-NS integration will be an effective way to improve oral availability and vivo function of AC. (Zidan MF, et al., 2018)
35 Casimiro Luca Gigliotti et al. Drug Deliv. 2017 Nov. Camptothecin β-cyclodextrin-nanosponges. CN-CPT significantly impaired development, vascular permeability and the use of orthotopic ATC xenografts vascularization in SCID/beige mice without significant toxic effects on vivo. (Gigliotti CL, et al., 2017)
36 Nesa Rafati et al. J Microencapsul. 2019 Dec. Curcumin herbal remedies Cyclodextrin nanosponges Cytotoxicity test results did not show cell toxicity in a healthy cell line, while it was toxic compared to cancer cells. (Rafati N, et al., 2019)
37 Francesco Trotta et al. Chempluschem. 2016 May. Doxorubicin Cyclodextrin-based nanosponges The activity of this GSH (glutathione) reaction has been demonstrated using a few tumor cells and doxorubicin as a model anticancer drug. The arrival of the drugs was consistent with the content of GSH in tumor cells. (Mihailiasa M, et al., 2016)
38 Manuela Mihailiasa et al. Carbohydr Polym. 2016. Melatonin β-cyclodextrin nanosponges The result of the union is a 3-D structure allowed, in which melatonin atoms are made harder. (Ataee-Esfahani H, et al., 2011)
39 Hamed Ataee-Esfahani et al. Chem Commun (Camb). 2011 Silica particles Pt spheres It was shown that this technique improves the electrocatalytic performance of Pt catalysts by making electroactive species more accessible to the entire Pt surface. (Torne SJ, et al., 2010)
40 Martina Daga et al. Free Radic Biol Med. 2016 Aug. Doxorubicin glutathione-responsive cyclodextrin nanosponges(GSH-NS) It was demonstrated that GSH-NS inhibited human tumour growth in xenograft studies. It may be a viable carrier for future drug delivery aplications. (Alongi J, et al., 2011)

Table 2: Nanosponges driven research in formulation development

Infra-red spectroscopy: It can be used to study the interactions between nanosponges and drug molecules in a solid state. If there is a complex formation between drug mutations and nanosponge IR and if a fraction of drug molecules is subjected to a pressure of less than 25% bands and can be assigned to enclose a portion of other molecules that are easily marked with multiple nanosponges. This process is generally unsuitable for obtaining installed properties and is less specific than other methods (Deshmukh K, et al., 2016) (Table 3).

Drugs Nanosponges vehicle Indication Reference
Paclitaxel β-cyclodextrin Cancer (Minelli R, et al., 2011)
Tamoxifen β-cyclodextrin Breast cancer (Sharma R and Pathak K, 2011)
Camptothecin β-cyclodextrin Cancer (Swaminathan S, et al., 2007)
Econazole nitrate Ethyl cellulose, polyvinyl alcohol Antifungal (Aynie I, et al., 1999)
Itraconazole β-cyclodextrin and copolyvidonum Antifungal (Ansari KA, et al., 2011)
Antisense Sodium alginate Cancer therapy (Ansari KA, et al., 2011)
Resveratrol β-cyclodextrin Inflammation, cardiovascular diseases, dermatitis, gonorrhoea (Aynie I, et al., 1999)

Table 3: Nanosponges based marketed formulation

Conclusion

Nanosponges are a novel class of drug delivery systems as they treat both hydrophilic and hydrophobic drugs by forming inclusion and non-inclusion complexes. They can deliver drugs through a different route such as oral, topical and parenteral. This nano technology provides beneficial effects that improve stability, reduce side effects and improve flexibility. In the field of drug delivery, potential applications are available for cosmetics, biomedicine, agro-chemistry and catalysis. The drug carrier delivered by nanosponges can be shown to be safe and effective and the pharmaceutical industry will benefit greatly if medical studies prove that they can be used by humans.

Scope of the Study

The field of nanosponges continues to grow interest with major discoveries as well as new scientific challenges. Nanosponges play a role in the various fields of drug delivery systems like oral, topical, intravenous and immuno-suppressant. Nanosponge’s particle can also play role in the targeted drug delivery system which is effective via lungs, liver and spleen. Some techniques can also be used to identify nanosponges at disease sites like Crohn’s disease, auto-immune disease and cancer which are affected in different organs or tissues. Nowadays, nanosponges are also used in gastro-retentive drug delivery systems.

References

Author Info

Shiwangi Singh* and Monika K
 
Department of Pharmacy, Noida Institute of Engineering and Technology, Greater Noida, India
 

Citation: Singh S: Nanosponges as Emerging Carriers for Drug Delivery

Received: 15-Dec-2021 Accepted: 29-Dec-2021 Published: 05-Dec-2022, DOI: 10.31858/0975-8453.13.1.55-62

Copyright: This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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