Vaccination is still the most cost-effective way to combat infectious illnesses. Conventional vaccinations may have low immunogenicity and, in most situations, only provide partial protection. A new class of nanoparticle-based vaccinations has shown considerable promise in addressing the majority of the shortcomings of traditional and subunit vaccines. This is due to recent breakthroughs in chemical and biological engineering, which allow for the exact regulation of nanoparticle size, shape, functionality, and surface characteristics, resulting in improved antigen presentation and robust immunogenicity. A blend of physicochemical, immunological, and toxicological experiments can be used to accurately characterize nanovaccines. This narrative review will provide an overview of the current scenario of the nanovaccine.

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Morus alba Linn. is a plant with varieties of phytochemicals and commonly known as Mulberry tree or Nuni (in Assamese). Mulberry is a perennial and woody plant, belongs to the family Moraceae consider as a native plant of China. In Assam, the leaves of mulberry tree are out most important in horticulture department for feeding purpose. A literature survey was done out by using key words such as Morus alba, or mulberry tree or phytoconstituents, or pharmacological activities, or ethnobotany on the search engine namely Scopus, Web of Science, Google Scholars, PubMed. The purpose of this article is to forward a solid review about the plant profile, method of extraction, phytochemicals constituents and pharmacological activities in reference to SARS-CoV-2. All the parts of Morus alba are phytochemically rich but highest number can be found in fruits and leaves. Fruits of Morus alba contains various class of phytochemicals such as alkaloids, anthocyanins, stillbenoids, flavones. Owing to presence of this compounds, it exhibits various pharmacological. Its leaves, fruits and root bark containing flavonoids, anthocyanins, alkaloids and stilbenoids, possess various pharmacological properties. Resveratrol is one of the most important compounds found in M. alba which possess SARS-CoV-2 inhibiting potential. Still there are some gaps remain in exploring whole plants parts and successive studies of toxicity.

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The isoquinoline compounds from alkaloidal class have been excellent source of important phytoconstituents having wide range of pharmacological activities. Berberine is a protoberberine alkaloidal compound obtained from Berberis genus plants which belongs to family Barberidaceae. Due to its unique structural properties, berberine and its derivatives has been exploited extensively for its potential uses in various pharmacological targets such as cancer, inflammation, diabetes, gastrointestinal disorder, viral and microbial infections, neurological disorder like Alzheimer, anxiety, schizophrenia, depression, etc. This review illustrates the updated information on berberine with respect to its isolation, biosynthesis, chemical synthesis, structural modification and pharmacological activities. An extensive literature search were carried out in various search engine like PubMed, Google Scholars, Research Gate and SCOPUS by using keywords like Berberine, protoberberine alkaloids, isoquinoline derivatives, pharmacological effects, etc. Prephenic acid is the starting material for biosynthesis of berberine. Structural modifications lead to generation of various potential derivatives, which earn patents by researchers. Besides toxicities, the complications of low solubility and bioavailability should be eliminated. To improve its safety, efficacy and selectivity the berberine should be carefully derivatized.

Corona Virus Disease-19 (COVID-19) is a pandemic disease mainly caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It had spread from Wuhan, China, in late 2019 and spread over 222 countries and territories all over the world. Earlier, at the very beginning of COVID-19 infection, there were no approved medicines or vaccines for combating this disease, which adversely affected a lot of individuals worldwide. Although frequent mutation leads to the generation of more deadly variants of SARS-CoV-2, researchers have developed several highly effective vaccines that were approved for emergency use by the World Health Organization (WHO), such as mRNA-1273 by Moderna, BNT162b2 by Pfizer/BioNTech, Ad26.-COV2.S by Janssen, AZD1222 by Oxford/AstraZeneca, Covishield by the Serum Institute of India, BBIBP-CorV by Sinopharm, coronaVac by Sinovac, and Covaxin by Bharat Biotech, and the first US Food and Drug Administration-approved antiviral drug Veklury (remdesivir) for the treatment of COVID-19. Several waves of COVID-19 have already occurred worldwide, and good-quality vaccines and medicines should be available for ongoing as well as upcoming waves of the pandemic.Therefore, in silico studies have become an excellent tool for identifying possible ligands that could lead to the development of safer medicines or vaccines. Various phytoconstituents from plants and herbs with antiviral properties are studied further to obtain inhibitors of SARS-CoV-2. In silico screening of various molecular databases like PubChem, ZINC, Asinex Biol-Design Library, and so on has been performed extensively for finding effective ligands against targets. Herein, in silico studies carried out by various researchers are summarized so that one can easily find the best molecule for further in vitro and in vivo studies.

Medicinal plants or medicinal herbs possess therapeutic properties or exert beneficial pharmacological effects on human. From time immemorial, people have been using various medicinal plants without even knowing their phytochemistry and pharmacological properties as a medicine for treating numerous ailments. As technology developed and upgraded, people used to screen out various phytoconstituents as well as evaluate their basic pharmacological properties. Tinospora cordifolia is a medicinal herb which is commonly known as Giloy belong to family menispermaceae. It can also be found in places like Africa, China, South-East Asia, Indo-Malaya region and Australia. Traditionally, people use this herb as prominent food materials due to their higher nutraceutical value and various healing properties. For phytochemical investigation, extraction of whole plant is preferable whereas most of the phytochemical are found to be present in leaves. Various potent phytochemicals are found in this herb such as tinosponone, tinocordiside, tinosporaside, cordifoliside, β-sitosterol, mekisterone A, etc. which are belong to class of alkaloids, sesquiterpenoids, glycosides, steroids, volatile oil, etc. Owing to the presence of these potent compounds, it exhibits wide range of large number of pharmacological activities such as antiviral, antibacterial, antifungal, antioxidant, antidiabetic, anticancer activities, etc. In past two years, SARS-CoV-2 infections has taken life of millions of people across the globe and there were no any vaccine or proper antiviral medicine available to defend this deadly pandemic, hence people were mostly relying on herbal plant therapy. Giloy is one such magical herb which exhibit healing properties in SARS-CoV-2 infected patients. Moreover, in-silico studies have been carried out to determine the binding affinity as well as inhibiting potential of various phytoconstituents of giloy. In this review work, we compiled all the updated information about T. cordifolia as well as emphasizing more on SARS-CoV-2 inhibiting potential.