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Zahra, F.T.; Quick, Q.; Mu, R. Electrospinning for Drug Delivery Systems. Encyclopedia. Available online: https://encyclopedia.pub/entry/49692 (accessed on 06 September 2024).
Zahra FT, Quick Q, Mu R. Electrospinning for Drug Delivery Systems. Encyclopedia. Available at: https://encyclopedia.pub/entry/49692. Accessed September 06, 2024.
Zahra, Fatima T., Quincy Quick, Richard Mu. "Electrospinning for Drug Delivery Systems" Encyclopedia, https://encyclopedia.pub/entry/49692 (accessed September 06, 2024).
Zahra, F.T., Quick, Q., & Mu, R. (2023, September 27). Electrospinning for Drug Delivery Systems. In Encyclopedia. https://encyclopedia.pub/entry/49692
Zahra, Fatima T., et al. "Electrospinning for Drug Delivery Systems." Encyclopedia. Web. 27 September, 2023.
Electrospinning for Drug Delivery Systems
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This entry is adapted from the peer-reviewed paper 10.3390/polym15183837

The term “drug delivery” refers to administrating the therapeutic effect of a pharmaceutical compound to humans or animals. Progress in the field of disease exploration is widely acknowledged, leading to ongoing research and development of advanced techniques for advanced drug delivery systems (DDSs). Electrospinning is a cost-effective and simple tool that is used for the preparation of drug delivery systems using natural, synthetic, and blended polymers. 

electrospinning polyvinyl alcohol (PVA) nanofibers drug delivery wound dressing

1. Introduction

The term “drug delivery” refers to administrating the therapeutic effect of a pharmaceutical compound to humans or animals. Progress in the field of disease exploration is widely acknowledged, leading to ongoing research and development of advanced techniques for advanced drug delivery systems (DDSs). Some of the key factors in developing an effective and controlled drug delivery system include its inertness, non-toxicity, biocompatibility, high mechanical strength, patient comfort, and high drug-loading capability. To streamline and optimize the performance of this domain, an extensive array of polymers has been researched and effectively employed. The polymeric drug delivery systems have various categories such as microparticles, micelles, hydrogels/transplants, nanoparticles, and drug conjugates [1][2][3][4][5][6][7]. These systems are employed to improve controlled drug release, targeted drug delivery, and solubility. Generally, polymers are categorized as natural or synthetic polymers. Figure 1 illustrates the most frequently used polymers in both categories for the development of DDSs. Natural polymers are sometimes blended with synthetic compounds to chemically modify their functional groups, resulting in what is known as semi-synthetic polymers. Chitosan (CS) is one of the most commonly explored natural polymers and various studies have been reported on its potential in developing advanced drug delivery systems [8][9][10][11][12]. Synthetic polymers are sub-divided into hydrophobic and hydrophilic groups which are utilized in DDSs as core–shell nanoparticles depending on the required criteria. The drug release and drug loading efficiency of hydrophilic polymers is believed to be higher than those of hydrophobic polymers [13]. Combining hydrophobic and hydrophilic synthetic polymers in various proportions has also been employed for the development of drug nanocarriers. For instance, the combination of poly(ethylene glycol) (PEG) and polycaprolactone (PCL) has been utilized to investigate the endocytosis pathways into cells [14]. Polymeric capsules have been developed for cancer therapy by incorporating targeting ligands, thereby mitigating the accompanying side effects and toxicity [15]. Polymers are commonly used to develop transdermal DDSs, wound dressings, cancer therapy, tissue engineering, and oral DDSs. The disadvantages associated with commonly used synthetic/natural polymers such as PCL, PLGA (poly(lactic-co-glycolic acid)), and PLA (poly(lactic acid)) include the slow degradation and biocompatibility issues due to the formation of acidic degradation products [16][17].
Polymers 15 03837 g001
Figure 1. Categories of polymers and the most used polymers in each category for DDSs. The polymer under discussion Polyvinyl Alcohol (PVA) is highlighted in synthetic polymers category.
Polyvinyl alcohol (PVA) is a synthetic biopolymer that has been used for decades as a blending polymer with natural and synthetic polymers to improve the efficacy of DDSs. It is synthesized by the hydrolysis of polyvinyl acetate (PVAc) [18]. Depending on the degree of hydrolysis, which varies between 80 and 99%, PVA [CH2CH(OH)]n is subdivided into two categories, i.e., partially hydrolyzed and fully hydrolyzed. Figure 2 shows the molecular structure of both categories.
Polymers 15 03837 g002
Figure 2. Molecular structure of partially and fully hydrolyzed PVA. C, O, and H refer to carbon, oxygen, and hydrogen, respectively.
PVA possesses a semicrystalline solid structure and is not only biocompatible, biodegradable, non-toxic, and hydrophilic, but also has a good spinning capability, and thus holds significant potential in electrospinning-based DDSs. There have been a few review papers that have examined the use of PVA in drug delivery systems for specific applications, such as tissue engineering and cancer therapy [19][20].

2. Electrospinning for DDSs

Electrospinning is a cost-effective and simple tool that is used for the preparation of drug delivery systems using natural, synthetic, and blended polymers. Figure 3 shows the schematic of the electrospinning process. In the electrospinning process, generally, the flow pump, spinneret, collector (e.g., a plane conducting sheet, rotating drum), and high voltage power supply are the main components. The spinneret is connected to a high-voltage source while the collector is grounded. The flow rate is set using the flow pump and it depends mainly on the viscosity of the polymer solution. Once the voltage is applied, the positively charged solution travels from the needle tip toward the grounded collector. The formation of the Taylor cone on the tip of the needle is an important factor without which the fibers may not be formed. Electrospinning has excessively been used for the development of different drug delivery systems and the process parameters mentioned above significantly affect the fiber morphology. For example, a higher flow rate can lead to high bead density, higher viscosity leads to an increase in diameter, lower viscosity results in bead formation, and longer needle-to-collector distance can result in instability of the electric field and hence negatively affect the fiber formation [21]. Therefore, it can be concluded that optimization of the processing parameters is an important phase in obtaining fine and bead-free fibers and surface morphology. Natural and synthetic polymers that have been most widely used in electrospun drug delivery systems are listed in Table 1.
Polymers 15 03837 g003
Figure 3. Schematic of electrospinning and its types.
Table 1. Limitations and advantages of the most commonly used natural and synthetic polymers for electrospun DDSs.
Polymer,
Type of Polymer		 Limitations Advantages Ref.
Chitosan
Natural		 Extremely hydrophilic which leads to loss of nanofibrous structure, high degradation rate, and poor mechanical strength Non-toxic, and biodegradable qualities make it biocompatible with a wide range of organs, tissues, and cells. [9][22]
Gelatin
Natural		 Rapid degradation, poor mechanical strength, and complete dissolution Intrinsic bioactivity, high biocompatibility, cell adhesion, biodegradability, low immunogenicity [23][24]
Hyaluronic Acid
Natural		 High viscosity, high surface tension, low evaporability, high electrical conductivity that may lead to electrospinning circuit failure Biocompatibility, non-immunogenicity, biodegradability, excellent tumor-targeting ability [25][26][27][28]
Collagen
Natural		 Variability in enzymatic degradation rate (depending on enzyme concentration), difficult to maintain its dimension in vivo due to swelling, poor mechanical strength, in vivo (not suitable for load-bearing tissues) Biocompatible, non-antigenic, non-toxic, biodegradable (degradation can be regulated via crosslinking), compatible with synthetic polymers, promotes blood coagulation [29][30]
Alginate
Natural		 Low solubility, high viscosity due to high MW, high density of hydrogen bonding, polyelectrolyte nature of aqueous solution, and lack of appropriate organic solvent. High water content, nontoxicity, soft consistency, biocompatibility, biodegradability, low immunogenicity [31][32]
PLA
Natural		 Poor mechanical strength, low cell adhesion because of its hydrophobicity, biological inertness, acidic degradation products, inflammation in vivo Biocompatible, biodegradable by hydrolysis and enzymatic activity, low immunogenicity [33][34]
PLGA
Synthetic		 Poor hydrophilicity, poor cell adhesion, higher viscosity, production of acids upon degradation Strong biodegradability, suitable for controlled-release drug delivery of medicines, peptides, proteins, and other substances [35][36]
PCL
Synthetic		 High hydrophobicity, poor bioactivity, low mechanical strength, and higher amount of PCL reduces the swelling capability of DDS Slower degradation rate, shorter in vivo adsorbable time, generation of a minimal acidic environment during degradation [37][38]
PEG
Synthetic		 Low molecular weight makes it challenging to electrospin Non-toxic, non-immunogenicity, good biocompatibility, and anti-protein adsorption [39][40]
The bold and italic texts in Column 1 signify the name of the polymer and its category, respectively.
One of the primary benefits of utilizing electrospinning in drug delivery systems lies in its ability to regulate the rate of drug release. This control is achieved by manipulating the degradation rate of the fibers through factors such as molecular weight and distribution, porosity of the fibers, and composition. The volatility of the solvent is a crucial consideration, particularly in the development of drug delivery systems (DDSs), as it significantly influences the achievement of the desired porosity of the fibers. This porosity is a critical factor in obtaining the desired drug release characteristics. Non-volatile solvents result in the generation of fibers characterized by larger pore sizes and reduced surface area, which is unfavorable for drug delivery applications [41][42]. Alongside solution volatility, solution viscosity, surface tension, and conductivity are noteworthy attributes that impact the morphology of the fibers. The viscosity of the solution is directly influenced by the concentration of the polymer employed, and it serves as a crucial parameter for controlling the spinnability of the solution. Lower viscosity is associated with the production of thin fibers that exhibit favorable mechanical strength. However, when the viscosity of the solution is very low, specifically below 1 poise, it results in the formation of beads and has a detrimental impact on the spinnability of the solution. Similarly, the presence of a significantly high viscosity, exceeding 20 poise, impedes the flow of the polymer, thereby preventing the successful fabrication of fibers. It is widely believed that in order to achieve optimal fiber morphology, the recommended viscosity range is between 1 and 20 poise, with a corresponding surface tension range of 35–55 dyn/cm2 [43]. Additionally, the conductivity of the solution is a crucial parameter that primarily influences the formation of the Taylor cone. If the surface of the droplet does not possess sufficient charge, it can hinder the formation of the Taylor cone, thereby potentially impeding the process of fiber formation. Additionally, it has been observed that the diameter of the fibers decreases as the solution conductivity increases. This phenomenon can be attributed to the application of tensile force in the presence of an electric field [44][45][46].
As shown in Figure 3, uniaxial, coaxial, and triaxial electrospinning is utilized for the preparation of monolithic fibers, core–shell fibers, and triaxial fibers, respectively, for the development of DDSs. In the case of uniaxial fiber fabrication, a single spinneret is used with a solution containing a combination of a drug and a polymer. For core–shell fibers, two spinnerets are utilized, each with its own solution: one for the core (typically a drug) and another for the shell (a polymer). Lastly, three spinnerets are employed for triaxial fibers, with one for the shell (a polymer), another for an intermediate layer, and a third for the core material [21]. Encapsulation of drugs in the electrospun fibers has been utilized for the development of controlled-release therapeutic elements in a timely manner to avoid potential side effects [47]. Moreover, electrospun fiber scaffolds have also been utilized for the restoration as well as repair of tissues/organs [48].
Emulsion electrospinning (Figure 3) is a type of uniaxial (needle-less (rotating electrode) or with a needle) electrospinning technique that is used to prepare core–shell fibrous structures using water-in-oil (W/O) or oil-in-water (O/W) emulsions to encapsulate hydrophilic or hydrophobic compounds, respectively. The emulsion consists of two liquid phases: an aqueous phase (hydrophilic) and an oil phase (hydrophobic). The drug is dissolved in the aqueous phase and then dispersed in the organic polymer solution (oil phase). The oil phase, characterized by a higher evaporation rate, exhibits increased viscosity. During the emulsion electrospinning process, the aqueous phase, containing the drug, merges into the core of the fiber structure, while the oil phase tends to migrate towards the periphery. This technique has demonstrated efficacy in achieving prolonged drug release.
Figure 4 shows the publication data until 2022 for keywords “electrospinning” and “drug delivery” extracted from Web of Science. More than 200 papers in the same field have already been published in 2023. This clearly shows the high potential of electrospinning and the interest of researchers in electrospinning to develop drug delivery systems.
Polymers 15 03837 g004
Figure 4. Number of publications until 2022 on electrospinning-based DDSs. The data were extracted from Web of Science (WoS).

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Fatima T. Zahra
,
Quincy Quick
,
Richard Mu
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Update Date: 27 Sep 2023
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