INTRODUCTION:

Herbal medicines have been used since ancient times to treat a variety of diseases with few side effects and are a much safer therapeutic approach than chemically synthesized medicines. As a result, an improved novel Phyto-pharmaceutical approach can now solve the clinical and pharmaceutical needs of herbal medicines to develop various novel drug delivery systems such as microspheres, sub-micron particles, nanoparticles, liposomes, solid lipid nanoparticles, and micelles.¹

Most conventional drug dosage administrations target only a small portion of the administered dose, while the majority of the drugs dissipate throughout the body due to their respective physicochemical and biochemical properties, resulting in a low therapeutic effect. Nano-formulations are regarded as an important drug delivery system with the most potent site-specific targeted delivery of administered or loaded drugs among all novel drug delivery systems.²As a result, several medicinal plants or herbs, as well as bioactive molecules-based formulations, have been biomedically engineered and studied for their efficacy and valediction against a variety of fatal diseases. As a result, the overall effect of administered drugs must have a sensitive reduction in toxicity or adverse effects, and despite all remarkable recent methodologies, design and engineering of herbs-based nanomaterials systems have safer and more cost effective established multiform interactions within the specific biological, physicochemical, and pathophysiological environment.³Different parts of the plant may necessitate a different extraction method for the therapeutic constituent. Plants have a variety of physiological, chemical, and genetic properties. Herbal medicines are superior to modern synthetic medications. The pharmaceutical analysis of herbal drugs began in the early nineteenth century. Because most drugs administered were digested by gastric PH, some drugs were toxic to mucosa of GIT, human body is full of fluid i.e. mainly water, and hydrophobic drug cannot reach the blood as directly administered, these drawbacks must be noted first. Herbal medicines were not considered for use in modern pharmaceutical development due to numerous failures.⁴Flavonoids, tannins, and terpenoids are hydrophilic and less permeable to biological membranes due to their high molecular weight, resulting in reduced absorption and loss of drug bioavailability and efficacy. Drugs are protected from photooxidation and thermal degradation by nanoparticles.⁵

Nanomaterials: Herbonanoceuticals:

Nanomaterial have been reported as highly efficient transport module for loaded chemical and biological compounds includes micelles, polymers, carbon tubes, gold, silver and liposomes.14-16 Nanocarriers are currently exploit in various drug delivery systems due to having their improved bioavailability and sustained delivery when used in various well-known chemotherapies. These bio-medically engineered nanocarriers are designed into various modified forms like polymer conjugates, gold nano shells and nanocages, polymeric nanoparticles, lipid-based carriers, dendrimers, carbon nanotubes, gold nanoparticles and lipid-based nanomaterials like liposomes and micelles.^6,7These various types of biomedically engineered nanomaterials are being used in nanocarriers that have reported positive hydrophobic and hydrophilic interactions with loaded drugs, demonstrating safe and sustained delivery of loaded drugs throughout the body. The only issue with long-term administration of nanocarrier-based drug delivery is unintended or untraceable toxicity at the physiological and molecular levels.⁸ Gardea-Torresdey et al. reported the synthesis of gold and silver nanoparticles using herbal extracts in order to investigate their delivery potency as a safe and cost-effective herbal-based therapeutic approach used as herbonanoceuticals.Vitamins, carbohydrates, plant extracts, and biodegradable polymers have been employed in recent years to manufacture green technology-based nanoparticles, and herbal plant extracts are thought to be the best reducing agents due to their pilot-scale manufacturing. Polyphenols in plant extracts have well-known high reduction potential, and because of their side chain groups (mainly –OH group), herbal plant extracts have more effective antioxidant activities for free radical scavenging. As a result, plant extracts are found to have an important function in capping and stabilizing nanoparticles, hence increasing the biocompatibility of formulated formulations. Gold nanoparticles were also manufactured utilizing the flower of Couroupita guianensistree, which proved to be highly fast and cost-effective, as well as having good chemical or photo-thermal activity. MTT assay, DNA fragmentation, apoptosis by DAPI staining, and comet assay for DNA damage are all used to test the anticancer efficacy of these herbal-based gold nanoparticles. Glucoxylans are isolated from the seeds of Mimosa pudica and utilized to make gold nanoparticles without the need of a stabilizing agent before being examined for clinical effectiveness.⁹

Nanoparticles and Their Roles in Drug Delivery:^10,11

Nanoparticles are very small materials with a size range from 1 to 100 nm.

Their classification depends upon their properties, shapes, or sizes. They are mainlycate-gorized into four groups: fullerenes, metal nanoparticles, ceramic nanoparticles, and polymeric nanoparticles.

Nanoparticles are composed of three different layers:

(1) A surface layer modified by various small molecules, metal ions, surfactants, and polymers;

(2) A shell layer, chemically different from the core material;

(3) The core of the nanoparticle properties with fewer side effects; hence, herbal nanoparticles are frequently used in drug delivery

Need for Nanotechnology for Herbal Drugs:^12,13

As the different elements of herbal pharmaceuticals enter the blood, they will be damaged in the very acidic pH of the stomach, and some of the constituents may be processed by the liver, resulting in an insufficient number of herbal drugs reaching the circulation. As a result, if the medicine does not reach the target region in the ideal amount at a "minimum effective level," it will not have any therapeutic effect. Because of their nano size, the use of nanotechnology with herbal medicines delivers the medication in the ideal quantity to the site of action, bypassing all barriers such as acidic pH of the sto

Strategies of Nanotechnology as

Novel Drug Delivery System:¹⁴

Nano-sized delivery system of herbal medicine was selected because of the

Following reasons:

1 Because of their unique size and high loading capacities, Herbonanoceuticals appear to be able to deliver high concentrations of drugs to the site of action.

2 Small particle size of the drug increases the entire surface area, thus faster dissolution of the drug in the blood.

3 The concentration seems to remain at the sites for a longer period of time.

4 They exhibit the EPR (enhanced permeation and retention) effect. Their small size offers enhanced permeation through the barriers and retention due to poor lymphatic drainage as in the case of tumors.

5 They show passive targeting to the disease site of action without the addition of any particular ligand moiety.

6 Decrease in the side effects.

7 Decrease in the dose of the drug formulation.

Nano drug delivery systems for herbal extracts:^15,16

To maximize patient compliance and avoid repeated administration, Phyto therapeutics require a scientific approach to distribute the components in a continuous manner. NDDSs for herbal components can be used to accomplish this. NDDSs not only aid to overcome non-compliance by lowering toxicity and enhancing bioavailability, but they also help to boost therapeutic value by reducing toxicity and increasing bioavailability. Two requirements should be met by the innovative carriers. First, it should distribute the drug at a pace determined by the body's demands over the course of treatment. Second, it should transport the active ingredient of the herbal drug to the site of action. None of these can be met by conventional dosage forms, including prolonged-release dosage forms. It has a lot of benefits for herbal medications, including improved solubility and bioavailability, toxicity protection, increased pharmacological activity, increased stability, improved tissue macrophage dispersion, prolonged delivery, and protection from physical and chemical degradation. As a result, nano-sized NDDSs of herbal pharmaceuticals have a promising future for improving activity and overcoming issues connected with plant medicines. Because of their small size, nanocarriers applied to herbal treatments will convey the ideal amount of the medicine to their site of action while avoiding all barriers such as acidic pH of the stomach, liver processing, and increasing the drug's prolonged circulation in the blood. As a result, using herbal remedies in an NDDS would improve the use of herbal remedies that will emerge to cure the numerous chronological disorders. Because of its distinctive small size and regulated drug release, nanotechnology is nearing a new paradigm for drug delivery systems. As a result, utilising "herbal remedy" in nanocarriers will boost its potential for treating numerous chronic diseases and providing health advantages. This branch of pharmaceutical technology has evolved and diversified significantly in recent years, emerging tremendously from the macro to the micro level and now increasing at the molecular, i.e., nano level. Because of the shifting trends in creating medications and drug delivery systems, the role of technology in the field of pharmaceutics and medicine has grown.¹⁰ In some NDDSs, such as ocular drug delivery, nanotechnology has been employed to improve bioavailability by overcoming the limitations of traditional dose forms. This is possible due the capacity of the nanocarriers to protect the encapsulated drug molecule and transport it to various areas of the eyes.

Nanoparticles:

Nanoparticles are particles between 1 and 100 nanometers in size. In nanotechnology, a particle is defined as a small object that behaves as a whole unit with respect to its transport and properties. Particles are further classified according to diameter.

Properties of nanoparticles:¹⁷

· They are effectively a bridge between bulk materials and atomic or molecular structures.

· The high surface area to volume ratio of nanoparticles provides a tremendous driving force for diffusion, especially at elevated temperatures. Sintering can take place at lower temperatures, over shorter time scales than for larger particles.

· Suspensions of nanoparticles are possible since the interaction of the particle surface with the solvent is strong enough to overcome density differences, which otherwise usually result in a material either sinking or floating in a liquid.

· Nanoparticles also often possess unexpected optical properties as they are small enough to confine their electrons and produce quantum effects. For example, gold nanoparticles appear deep red to black in.

· Nanoparticles with one-half hydrophilic and the other half hydrophobic are termed Janus particles and are particularly effective for stabilizing emulsions. They can self-assemble at water/oil interfaces and act as solid.

· The photocatalytic activity of the nanoparticles must not lead to a self-destruction of the composite system, and it is essential to check this point before fixing a combination of polymer matrix and nanoparticles.

Advantages of nanoparticles over other NDDS:¹⁸

· Due its small size than microspheres and liposome’s they can easily pass through the sinusoidal spaces in the bone marrow and spleen as compared to other systems with long circulation time.

· Nanoparticles increases stability of drug/proteins against enzymatic degradation

· They offer a significant improvement over traditional oral and intravenous (IV) methods of administration in terms of efficiency and effectiveness.

Disadvantages of nanoparticles over other NDDS:

· Due to high surface area and energy, they tend to high aggregation in biological system.

· High immunogenicity

· Long and expensive to cost

· Chance of poor targeting.

Herbonanoceuticals:¹⁹

The strategy of applying nanotechnology to plant extracts has been widely cited in the literature, because nanostructured systems may potentiate the actions of plant extracts, promote sustained release of active constituents, reduce the required dose, decrease side effects, and improve activity Therefore, green nano synthesis of nanoparticles has been considered rapid, nontoxic, cost effective, and environmentally friendly in comparison with other chemical techniques. In green nano synthesis of metal nanoparticles, use of (1) nontoxic chemicals used as reducing agents, (2) environmentally friendly solvents, and (3) renewable materials as stabilizing or passivating agents is very important to consider. Synthesis of nanoparticles using plant and plant-based biopolymers can be considered green chemistry. Plant extracts are utilized to produce nanoparticles by reducing metal ions. Sugars, starches, proteins, polyphenols, alkaloids, terpenoids, phenolic acids, gums, and -cyclodextrin are just a few of the plant metabolites that have a role in metal ion reduction and nanoparticle stability. Because of their interactions with metal ions and metal nanoparticles, several well-known carbohydrate polymers, such as chitosan, have been used to synthesize metal nanoparticles in recent decades. The use of biodegradable and nonbiodegradable precursors to create nanomaterials has been intensively investigated in response to the growing need for sustainable and environmentally acceptable methods. For example, cyclodextrins have been used as stabilizing agents in the production of copper nanoparticles in the polysaccharide group. -Cyclodextrin is a cyclic oligosaccharide having seven units of -D-glucose that is nonreducing. The glucose rings are linked with a hydrophilic outer surface and a hydrophobic internal cavity via a -(1–4) connection. Because particles generated with it have the lowest size dispersion, it may form inclusion complexes with diverse chemical molecules and function as a stabilizing agent. This is owing to -cyclodextrin's rigid structure and poor water solubility, which allows for easy complex precipitation and therefore control of nanoparticle development. The weak stability and water solubility of nanoparticles make them unsuitable for use in biological processes. A capping agent or stabilizing agents are employed to prevent particle aggregation. One research used -cyclodextrin as a stabilizing agent and L-ascorbic acid as a reducing agent to make copper nanoparticles. Advanced techniques such as transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Nanodrop analysis, Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and ultraviolet–visible spectra were used to characterize the morphology of the synthesized Cu nanoparticles. Copper nanoparticles' antimicrobial and antibacterial capabilities are tested using a variety of strains. Ayurveda uses nanoforms of seven metals: gold (Au), silver (Ag), copper (Cu), iron (Fe), lead (Pb), tin (Sn), and zinc (Zn) (Zn). Applications of this ancient system are being rediscovered, and they have enormous potential for producing revolutionary metal–herb combinations with biomedical applications. The biocompatibility and therapeutic activity of phytoconstituents contained in plants play a decisive role in the selection of various herbs for generating such preparations. Because of their physiological compatibility, limited toxicity, natural origin, simple accessibility, and reduced prices, such Herbo mineral formulations may have a superior therapeutic potential. The unique idea of herbonanoceuticals was born out of the prospective uses of nanomaterial-based herbal medicines in biomedicine. Many investigations have revealed that the size of metal particles in Ayurvedic metal-based formulations shrinks to the nanometric range after processing. Swarna bhasma (gold ash) is a kind of gold that has a particle size of 56–57nm and a spherical form. It is utilized in a variety of traditional Indian Ayurvedic treatments. Ayurvedic remedies containing mercury have crystalline mercuric sulphide with a size range of 25 to 50 nanometers. For the manufacture of iron oxide nanoparticles, a modified bhasmikaran (a method for creating bhasma) approach based on green synthesis was used. Metal nanoparticles are generated during the Ayurvedic bhasmikaran technique, according to XRD and TEM investigations. Metal nanoparticles, in combination with other phytoconstituents, have the potential to improve therapeutic component absorption and even tissue-specific targeting in the body. These preparations are claimed to be more effective due to their tiny size, as naturally generated metal nanoparticles do not induce toxicity in the body. Many natural components, such as vitamins, carbohydrates (sugars), phytochemicals found in plant extracts, microorganisms, biodegradable polymers, and so on, might be used in the green production of metal nanoparticles. Because phytoconstituents, which are effective reducing agents, are present in plant extracts, they are employed in the commercial manufacture of metal nanoparticles.⁽²⁰⁾ Because of their hydroxyl side chains, polyphenols are the most common phytoconstituents in plant extracts that can function as reducing agents. . These can function as capping and stabilizing agents for the production of metal nanoparticles. Because of its biocompatibility, gold nanoparticles are among the most extensively used metal nanoparticles in the biomedical area. 7 Herbonanoceuticals: A Novel Beginning in Drug Discovery and Therapeutics A quick, cost-effective, and single-step approach for the synthesis of gold nanoparticles using a Couroupita guianensis floral extract (179). Green gold nanoparticle production was reported utilizing glucoxylans from Mimosa pudica seeds with no additional chemical stabilizing agent. The anticancer properties of many medicinal plants and active chemicals, as well as green-synthesized metallic nanoparticles from medicinal plants. Metal nanoparticles made from plant extracts exhibited improved tumor selectivity, potential activity, and a lower risk of toxicity in healthy cells. Nanoparticles' cytotoxic effects are mostly owing to their enormous surface area, which allows for effective drug administration, and certain nanoparticles have anticancer properties. However, further in vivo research is needed to validate the effectiveness of herbal nanoparticle–based medications in humans. Metal nanoparticles, such as quantum dots, metal oxide nanoparticles, and pure metal nanoparticles, have a variety of biological uses. Many researchers have proposed green production of metal nanoparticles using microbes and plant extracts, which have been proven to be environmentally friendly, cost-effective, and nontoxic. However, there are several issues with metal nanoparticles that must be solved before they may be used commercially. Metal nanoparticles used for various purposes have been documented to have a variety of features and derivations, and they are used in a variety of systems. Their possible adverse effects on patients and the environment, on the other hand, have yet to be adequately investigated. Various research have indicated contradictory biosafety factors regarding metal nanoparticles. Nano herbal formulations can be used to improve the selectivity, solubility, distribution, safety, and efficacy of herbal medications by targeting them to specific nanosized medicines have a larger surface area, allowing for quicker blood dispersion and lower toxicity while preserving therapeutic benefits. Nanoparticles with improved permeability and retention may be able to assist medications traverse the blood–brain barrier. Nanoparticles offer a variety of therapeutic applications that have been investigated by researchers all around the world.

Future prospects and opportunities in India:²¹

Nanotechnology offers various modern applications in NDDSs that potentially improve the diagnosis, treatment and help to monitor of post-administration transformation of drug composition within the body systems. Another important milestone to be mentioned here is computer aided drug design, which offers a lot of scope for the development of this kind of novel and advanced systems, helps in designing and developing the drugs and delivery systems consuming less time and resources with more accuracy and quality compared to traditional methods.²²

CONCLUSION:

Nanomedicine has sparked expectations in medicinal and health applications since nanotechnology was first presented and applied in medical applications. Improved treatment for some diseases and disorders, including growth, with greater viability and specificity several studies have been conducted over the years to give information on the capacity of nanocarriers, employing various strategies to deliver anticancer therapeutic agents that are artificially made or come from natural sources. This chapter has focused on the collaboration of nanotechnology in progressing the bioavailability of promising phytochemicals, which may encounter delivery issues in their free-drug form. It has also been demonstrated that many natural sources may yield chemicals that are suitable for usage.

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21. SD Mankar, N Bhanage, P Salunke, P Thorve - Research Journal of Pharmacognosy and Phytochemistry, 2021, Vol-13, Issue-03 -126-130

Received on 10.02.2022 Modified on 21.02.2022

Res. J. Pharmacognosy and Phytochem. 2022; 14(2):136-141.

DOI: 10.52711/0975-4385.2022.00026