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Versatility in drug delivery: The highly tunable nature of dendrimers allows for the
incorporation of various functional groups, creating a versatile platform for drug en-
capsulation, controlled release, and targeted delivery. The dendritic structure pro-
vides multiple sites for drug conjugation, enabling the encapsulation of diverse
therapeutic agents, including small molecules, proteins, and nucleic acids [28].
Size and biocompatibility: Dendrimers can be engineered to specific sizes, allowing
for the manipulation of their pharmacokinetic and pharmacodynamic properties. Fur-
thermore, the controlled surface functionalities contribute to improved biocompatibil-
ity and reduced toxicity, addressing critical concerns in drug delivery [28, 29].
6.4.1 Role of computational approaches
Computational tools in dendrimer design: The rational design of dendrimers for
drug delivery benefits significantly from computational approaches. These tools pro-
vide valuable insights into the complex interactions between dendrimers, drugs, and
biological systems. Computational methods offer a cost-effective and time-efficient
means to explore vast chemical space, guiding researchers in the selection and optimi-
zation of dendrimer structures for specific therapeutic applications [30].
Computation plays a central role in identifying alternative compositions of matter
with the requisite hydrophilic surface areas, cluster density, flexibility and surface
charge distribution required for bioactivity. The approach described should be appli-
cable to the design and synthesis of other bioactive dendrimers for other pathogen-
related TLR receptors, such as TLR2 and TLR3 [31].
Molecular docking: Molecular docking serves as a cornerstone in the computational
toolkit, predicting the binding affinity and orientation of drugs within dendrimer
structures. This information aids in the rational selection of drug–dendrimer combi-
nations, optimizing encapsulation efficiency and drug release kinetics.
A recent study was shown that the copper(II) complex had square planer shape
and that both the ligand and its complex were produced in good quantities. The anti-
fungal effects of the ligand and it s complex against Candida albicans (ATCC 90028)
were noteworthy. Each test compound’s antifungal efficacy is indicated by its mini-
mum inhibitory concentration values. Metal complexes significantly reduced the for-
mation of solid media, and the halo was evidently obvious. These findings suggested
that the produced chemicals may have fungicidal properties [32].
MD simulations: Dendrimers are distinct, highly branching macromolecules that em-
anate from a central core. They are created by a sequential, iterative r eaction se-
quence that ensures full shells for every generation, resulting in monodisperse
polymers. The synthetic protocols created for the synthesis of dendrimers provide for
almost total control over the important molecular design factors, including flexibility,
6 Computational methods in the pragmatic development of nanoemulsions 123
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topology, size, shape, and interior/surface chemistry. According to recent findings, den-
dritic polymers might hold the secret to creating useful nanoscale materials with dis-
tinctive features (electronic, optical, optoelectronic, magnetic, chemical, or biological) in
a dependable and cost-effective manner. These could then be applied to the creation of
novel nanoscale gadgets. In this work, we ascertain the three-dimensional molecular
structures of several dendrimers with the configurational Boltzmann’s bias [33].
Quantum mechanical calculations: Quantum mechanical calculations offer a de-
tailed understanding of the electronic structure and energetics of dendrimers. These
calculations aid in predicting stability, electronic properties, and the influence of den-
drimer structure on drug interactions at the atomic level [34].
Optimizing surface functionalities: Computational approaches play a pivotal role in
tailoring the surface functionalities of dendrimers. By predicting the interactions be-
tween dendrimer surfaces and biological entities, researchers can optimize functional
groups for enhanced biocompatibility, cellular uptake, and targeted drug delivery [35].
In summary, the integration of computational approaches in dendrimer design enhan-
ces the efficiency of drug delivery systems by providing a deeper understanding of
structure–function relationships. These computational tools guide researchers in over-
coming challenges associated with dendrimer-based drug delivery, ultimately contribut-
ing to the development of more effective and targeted therapeutic interventions.
6.5 Challenges and future perspectives
Despite the fact that computational approaches have greatly aided in the production
of nanoemulsions, PMs, and dendrimers for drug delivery, problems remain. Accu-
rate depiction of complex biological ecosystems, improved prediction models, and
expanded computational resources are critical for the field’sadvancement.To
bridge the gap between theoretical predictions and experimental validations, com-
puter scientists, chemists, and biologists must work together. Finally, computational
approaches are critical in the pragmatic creation of nanoemulsions, PMs, and den-
drimers for drug delivery. The combination of computational and experimental
methodologies improves the efficiency and efficacy of drug delivery system design,
eventually leading to the emergence of personalized and targeted medicines.
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Gowtham Menon, Rutuja Vilas Nikam, Sachin S. Gaikwad,
and Hemant U. Chikhale
7 Virtual screening of mucoadhesive
polymers for the development of efficient
drug delivery system: current approaches
Abstract: Mucoadhesion is a drug delivery method that uses water-soluble polymers to
target specific body regions over long periods. It involves pharmaceutical formulations
or devices adhering to and releasing drugs at specific mucosal surfaces, such as the gas-
trointestinal tract. Virtual screening of mucoadhesive polymers involves computational
techniques to identify and evaluate polymers that can adhere to mucosal surfaces. This
process is crucial for developing drug delivery systems, especially for oral, nasal, and
other mucosal routes, to enhance drug bioavailability and therapeutic efficacy. By em-
ploying these methodologies, researchers can efficiently identify and optimize polymers
for effective drug delivery systems, reducing the need for extensive experimental trials
which are discussed in detail in this chapter.
Keywords: Mucoadhesion, Computational, Virtual, Screening, Polymers
7.1 Introduction
The oral mucosal surface has high blood supply and offers various benefits over in-
jectable and enteral medication delivery modalities. It is also an alternate way of sys-
temic medication administration. The rate of absorption through the oral mucosa is
approximately four times that of the skin. The mouth cavity is divided into four regions:
buccal, sublingual, palatal, and gingival. When rapid onset of effect is necessary, the
sublingual mucosa is preferred due to its increased permeability, lower thickness com-
pared to the buccal mucosa, large surface area, and high blood flow. The idea of mu-
coadhesion has attracted a lot of interest in pharmaceutical technology since the early
1980s [1]. Mucoadhesion may be characterized as a drug delivery method that leverages
the bioadhesion feature of certain water-soluble polymers that become sticky during
hydration and can therefore be utilized to target medication to a specific region of the
body over lengthy periods [2]. Due to its permeability, strong recovery, and greater tol-
erance to allergens than other mucosal tissue, buccal mucosa is a possible target for
Gowtham Menon, Rutuja Vilas Nikam, Sachin S. Gaikwad, Department of Pharmaceutics, SRES
Sanjivani College of Pharmaceutical Education and Research, Kopargaon, Maharashtra, India
Hemant U. Chikhale, Department of Pharmaceutical Chemistry, Sandip Foundation’s Sandip Institute
of Pharmaceutical Sciences, Nashik, Maharashtra, India
https://doi.org/10.1515/9783111208671-007
https://t.me/med1917
regulated drug administration in a variety of chronic therapies. For a drug to be ab-
sorbed through the bu ccal area, it must have sp ecific physicochemical qualities. In
pharmaceutical sciences, mucoadhesion is a crucial phenomenon for enhancing local-
ized medication delivery or delivering protein and oligonucleotides in to the blood-
stream [3] Adhesion is a state described as the connection of two surfaces to one other.
Adhesion processes are proven to serve significant functions in nature and, as a result,
have a wide range of healthcare and non-biomedical consequences, such as bacterial
adhesion or water purification. Bioadhesion is defined in pharmaceutical sciences as
the capacity of a dose form to come into intimate contact with a biological substrate
through favorable interactions. This process is known as mucoadhesion when the bio-
logical environment is the mucosal surface. This strategy has been applied to several
solid, semisolid and liquid drug delivery systems, for example, buccal tablets, buccal
patches or films, buccal gels for periodontitis treatment, ophthalmic liposomes, vaginal
suppositories, as well as nano- or microparticles, nanosuspensions, microemulsions and
colloidal dispersions [4].
A mucoadhesive drug delivery system is a pharmaceutical formulation or device
designed to adhere to and release drugs or therapeutic agents at specific mucosal sur-
faces within the body. Mucosal surfaces include areas like the gastrointestinal tract
(oral cavity, stomach, and intestines), nasal cavity, ocular surface, and vaginal mucosa
[5]. Mucoadhesive drug delivery systems have several advantages over traditional
drug delivery methods, such as oral tablets or injections.
1. Prolonged drug release: Mucoadhesive systems can adhere to mucosal surfaces
and release drugs slowly over an extended period, providing a sustained thera-
peutic effect.
2. Enhanced bioavailability: By adhering to mucosal surfaces, these systems can im-
prove the absorption of drugs, especially those with poor solubility or low
bioavailability.
3. Reduced side effects: Targeted drug delivery to specific mucosal sites can mini-
mize systemic exposure and reduce unwanted side effects.
4. Improved patient compliance: Mucoadhesive dosage forms can be easier for pa-
tients to administer than injections or frequent oral doses, potentially improving
compliance with medication regimens.
There are various types of mucoadhesive drug delivery systems, including [6, 7]:
1. Mucoadhesive gels: These are semisolid formulations that adhere to mucosal sur-
faces, such as the oral cavity, nasal passages, or vaginal mucosa. They can be
used for local or systemic drug delivery.
2. Mucoadhesive patches: These are adhesive patches that can be applied to the
skin, oral mucosa, or other mucosal surfaces to release drugs gradually.
3. Mucoadhesive nanoparticles: Nanoparticles can be designed to adhere to mucosal
surfaces and release drugs in a controlled manner. They can improve drug stabil-
ity and enhance absorption.
128 Gowtham Menon et al.
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4. Mucoadhesive tablets or films: These solid dosage forms are designed to stick to
mucosal surfaces, upon contact, allowing for controlled drug release and
absorption.
5. Mucoadhesive microspheres: Microspheres are small particles that can be admin-
istered via various routes, including oral, nasal, or vaginal, to provide controlled
drug release.
Mucoadhesive drug delivery systems are used for various applications, including the
treatment of local conditio ns (e.g., oral ulcers and vaginal infections) and systemic
drug delivery (e.g., for hormones, analgesics, or anti-nausea medications). The choice
of formulation depends on the specific drug, the target mucosal surface, and the de-
sired therapeutic outcome. These systems are an area of ongoing research and devel-
opment in the pharmaceutical industry to improve drug efficacy, patient compliance,
and overall treatment outcomes.
7.2 Mechanism of mucoadhesion
The specific mechanism underlying mucoadhesion is yet unknown. Despite the ab-
sence of the underlying theory, conventional observational theories describe mucoad-
hesion in two stages. These are the contact stage and consolidation stage [8].
7.2.1 Stage 1: contact stage
The bioadhesive particles and the highly hydrated mucosal layer physically coll ide
during the contact stage. This stage involves the adhesive polymer particles’ wetting,
swelling, and adsorption, depending on th eir hydration state. When the polymer
reaches the mucosa, it absorbs water from the surrounding layers, swells, and is ad-
sorbed. Adsorption is required for small particles in suspension to adhere to the gas-
trointestinal mucosa via the interfacial tension produced at the point of contact [9].
7.2.2 Stage 2: consolidation stage
Consolidation is the second stage of mucoadhesion and consists of interpenetration
and particle diffusion in the mucosa, accompanied by the development of physical
and/or chemical interactions (van der Waals interactions, electrostatic interactions,
hydrogen bonding, and covalent bonds) among both systems, resulting in the forma-
tion of an entanglement network w ith mucin chains that enables strong and pro-
longed adhesion [10].
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Mucoadhesion can be explained by numerous general theories, including electri-
cal theory, adsorption theory, wetting theory, diffusion theory, fraction theory, and
mechanical theory [8–10].
7.2.2.1 Electronic theory
It is assumed that the two surfaces have opposing electrical charges. When the adhe-
sive interface and the adhering surface come into contact, an electron transfer occurs.
At the interface, an electrical double layer forms, and the attractive forces define the
mucoadhesive strength. Moreover, several attractive forces keep the two layers in
contact.
7.2.2.2 Adsorption theory
According to adsorption theory, the mucoadhesive machine adheres to the mucus by
secondary chemical interactions such as Vander Waals forces and electrostatic attrac-
tion hydrogen bonds, or via hydrophobic interactions.
7.2.2.3 Wetting theory
This theory applies to liquid adhesives, taking into consideration interfacial tensions
to estimate spreading and adhesion [11]. The contact angle method can be used to as-
sess the adhesive candidate–mucosa affinity; the smaller the contact angle, the higher
the affinity between the substance and the mucosa. When a liquid (the adhesive can-
didate) and a solid (the mucosa) interact, the contact angle shows the degree of wet-
ting. A contact angle equal to or close to zero suggests appropriate spreadability of
the adhesive candidate onto the mucosal tissue, which is required for mucoadhe-
sion [10].
7.2.2.4 Diffusion theory
It is described as the interperforation of mucin as well as polymer chains up to a suffi-
cient depth to form a se mipermanent adhesive bond. Such a penetration rate is de-
pendent on several parameters such as the nature of the mucoadhesive chains,
diffusion coefficient, flexibility, and motility, in association with contact time [12].
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7.2.2.5 Fracture theory
This is probably the most well-known hypothesis in study findings, and it is related to
the mechanical assessment of mucoadhesion [7, 12]. This hypothesis explains the
amount of force needed to separate two surfaces following adhesion [13].
7.2.2.6 Mechanical theory
The mechanical theory explains how the interlocking of liquids with the mucosa itself
causes the surface roughness of the mucosal tissue to affect the adhesion of liquids.
More specifically, such systems fill the irregularities of the rough surface, which are
causing an increase in the interfacial area available for adhesive interactions [14].
7.3 Mucoadhesive polymers
Mucoadhesive polymers are key components of mucoadhesive drug delivery systems
and are used to enhance the adhesion of drug formulations to mucosal surfaces
within the body. These polymers have properties that allow them to adhere to mucous
membranes, such as those found in the oral, nasal, ocular, vaginal, and gastrointesti-
nal cavities [15]. The adhesion of these polymers to mucosal surfaces helps in prolong-
ingdrugrelease,increasingdrugbioavailability, and improving the therapeutic
efficacy of various drugs. Here are some common mucoadhesive polymers.
7.3.1 Carbomers
Carbomers, such as carbopol, are synthetic polymers known for their excellent mu-
coadhesive properties. Carbomers are synthetic polymers commonly used as mucoad-
hesive agents in pharmaceutical and cosmetic formulations. They are part of a class
of polymers known as acrylic acid polymers and are particularly valued for their ex-
cellent mucoadhesive properties [16]. Here is more information on carbomers as mu-
coadhesive polymers:
Chemical structure: Carbomers are high-molecular-weight polymers of acrylic acid
cross-linked wi th polyalkenyl e thers or divinyl glycol. The chemical structure of
carbomers gives them the ability to form a network or gel structure in the presence of
water or other aqueous solutions.
Mucoadhesive properties: Carbomers exhibit strong mucoadhesive properties due
to their ability to form hydrogen bonds with mucin, a glycoprotein present on muco-
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sal surfaces in the body [17]. This adhesive interaction helps them adhere to mucous
membranes effectively.
Applications: Carbomers are used in a wide range of pharmaceutical and cosmetic prod-
ucts where mucoadhesion is desirable. Some common applications include:
– Oral products: Carbomers are used in oral drug delivery systems like oral gels
and mouthwashes, where they can adhere to the oral mucosa, providing sus-
tained release of drugs or active ingredients.
– Topical formulations: They are found in topical gels and creams, where they can
adhere to the skin or mucous membranes, allowing for controlled release of med-
ications or cosmetics.
– Ophthalmic formulations: Carbomers are used in eye drops and ophthalmic gels to
enhance ocular drug delivery by increasing contact time with the ocular surface.
– Vaginal formulations: In vaginal gels and creams, carbomers can adhere to the
vaginal mucosa, improving drug absorption and efficacy for conditions like vagi-
nal infections or contraception [18].
– Nasal formulations: Carbomers can be used in nasal sprays or gels for local or
systemic drug delivery through the nasal mucosa.
– Viscosity control: In addition to their mucoadhesive properties, carbomers are
also known for their thickening and viscosity-controlling abilities. They can be
used to increase the viscosity of formulations, making them easier to apply, im-
proving their stability.
– Safety: Carbomers are generally considered safe for use in pharmaceutical and
cosmetic products when used according to established guidelines. However, like
any ingredient, they should be used with care and in compliance with regulatory
standards.
7.3.2 Hydroxypropyl methylcellulose (HPMC)
Hydroxypropyl methylcellulose (HPMC) is a cellulose derivative often used in pharma-
ceuticals and has mucoadhesive properties. It can be found in various dosage forms
like tablets, gels, and ophthalmic formulations. HPMC is indeed a mucoadhesive poly-
mer commonly used in various pharmaceutical and biomedical applications. Mucoad-
hesive polymers are substances that have an affinity for mucous membranes and can
adhere to them [19]. HPMC has several properties that make it suitable for this purpose:
Biocompatibility: HPMC is generally considered safe for use in pharmaceuticals and
medical products. It does not cause significant irritation or damage to mucosal tissues.
Hydrophilicity: HPMC is highly hydrophilic, meaning it has a strong affinity for water.
This property allows it to form hydrogenbondswiththemucuslayeronmucous
membranes, promoting adhesion [20].
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