The pharmacological actions of benzylisoquinoline alkaloids are quite substantial, and have recently attracted much attention. One of the principle benzylisoquinoline alkaloids has been found in the unripe seed capsules of Papaver somniferum L. Although it lacks analgesic effects and is unrelated to the compounds in the morphine class, it is a peripheral vasodilator and has a direct effect on vessels. It is reported to inhibit the cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) phosphodiesterase in smooth muscles, and it has been observed to increase intracellular levels of cAMP and cGMP. It induces coronary, cerebral, and pulmonary artery dilatation and helps to lower cerebral vascular resistance and enhance cerebral blood flow. Current pharmacological research has revealed that papaverine demonstrates a variety of biological activities, including activity against erectile dysfunction, postoperative vasospasms, and pulmonary vasoconstriction, as well as antiviral, cardioprotective, anti-inflammatory, anticancer, neuroprotective, and gestational actions. It was recently demonstrated that papaverine has the potential to control SARS-CoV-2 by preventing its cytopathic effect. These experiments were carried out both in vitro and in vivo and require an extensive understanding of the mechanisms of action. With its multiple mechanisms, papaverine can be considered as a natural compound that is used to develop therapeutic drugs. To validate its applications, additional research is required into its precise therapeutic mechanisms as well as its acute and chronic toxicities. Therefore, the goal of this review is to discuss the major studies and reported clinical studies looking into the pharmacological effects of papaverine and the mechanisms of action underneath these effects. Additionally, it is recommended to conduct further research via significant pharmacodynamic and pharmacokinetic studies.

Diabetes mellitus is a life-threatening disorder affecting people of all ages and adversely disrupts their daily functions. Despite the availability of numerous synthetic-antidiabetic medications and insulin, the demand for the development of novel antidiabetic medications is increasing due to the adverse effects and growth of resistance to commercial drugs in the long-term usage. Hence, antidiabetic phytochemicals isolated from fruit plants can be a very nifty option to develop life-saving novel antidiabetic therapeutics, employing several pathways and MoAs (mechanism of actions). This review focuses on the antidiabetic potential of commonly available Bangladeshi fruits and other plant parts, such as seeds, fruit peals, leaves, and roots, along with isolated phytochemicals from these phytosources based on lab findings and mechanism of actions. Several fruits, such as orange, lemon, amla, tamarind, and others, can produce remarkable antidiabetic actions and can be dietary alternatives to antidiabetic therapies. Besides, isolated phytochemicals from these plants, such as swertisin, quercetin, rutin, naringenin, and other prospective phytochemicals, also demonstrated their candidacy for further exploration to be established as antidiabetic leads. Thus, it can be considered that fruits are one of the most valuable gifts of plants packed with a wide spectrum of bioactive phytochemicals and are widely consumed as dietary items and medicinal therapies in different civilizations and cultures. This review will provide a better understanding of diabetes management by consuming fruits and other plant parts as well as deliver innovative hints for the researchers to develop novel drugs from these plant parts and/or their phytochemicals.

Introduction: ZnO nanoparticles (NPs) have garnered significant attention due to their remarkable multifunctionality, particularly in biomedical and environmental applications. Methods: The study synthesized ZnO NPs using Citrus reticulata Blanco peel extracts. The structural, morphological, and optical properties of ZnO NPs have been analyzed. The antibacterial and antioxidant activity of ZnO NPs was assessed using disk diffusion and DPPH scavenging method, respectively. Molecular docking was further conducted to support our experiments. In addition, the photocatalytic activity of biosynthesized ZnO NPs was tested using methylene blue (MB) dye. Results: X-ray diffraction (XRD) results indicate that NPs possess a hexagonal wurtzite crystal structure. The crystallite size of the NPs was 30.12 nm. Field emission scanning electron microscopy (FESEM) analysis revealed quasi-spherical and rod-shaped ZnO NPs. Energy Dispersive X-ray (EDX) showed that Zn and O were 86.59% and 13.41% of the total weight, respectively. Optical analysis revealed that the absorption edge was at 373 nm and the band gap was 3.09 eV for ZnO NPs. Moreover, the maximum zone of inhibition was measured at 16.17 ± 0.72 mm, 10.5 ± 0.28 mm, 16.17 ± 0.44 mm, and 12.17 ± 0.44 mm against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Shigella flexneri, respectively. Compared with BHT, ZnO NPs showed promising antioxidant performance with an IC₅₀ value of 149.01 μg/mL. The photocatalytic efficiency of the ZnO NPs was 6.8%, 8.42%, and 10% after 30, 60, and 90 minutes, respectively. Hesperidin, naringin, rutin, and tangeritin, the principal constituents of C. reticulata peel, also showed higher and promising binding affinities against the receptors, with remarkable results compared to the standard in molecular docking analysis. The ADMET analysis also demonstrated that ZnO NPs exhibited low probabilities of hepatotoxicity (3%), nephrotoxicity (20%), and respiratory toxicity (20%), with moderate neurotoxicity (52%). Conclusion: In summary, this study revealed morpho-structural features of green synthesized ZnO NPs and their photodegradation efficiency and bioactivity.

Bangladesh is endowed with an abundance of excellent medicinal plant resources. A well‐known traditional medicinal plant Piper chaba H. from the Piperaceae family is rich in bioactive phytochemicals that have antidiarrheal, antimicrobial, analgesic, antioxidant, anticancer, and cytotoxic effects. This plant is locally known as “Chuijhal,” and the stem is used as spices. In the current research program, the stems of the P. chaba plant were selected and its chemical and biological investigations such as antidiarrheal, antimicrobial, and analgesic effects were performed. Moreover, docking models were accomplished by exploiting PyRx‐Virtual Screening software and implied that isolated compounds of P. chaba exert different pharmacological activity by inhibiting their targeted receptors. Phytochemical investigations revealed the isolation of Chingchengenamide A, a relatively rare alkaloid from the stems of P. chaba . Another alkaloid Chabamide I which is a piperine dimer was also isolated. Their structures were confirmed by comparing these compounds' spectral data ( ¹ H and ¹³ C NMR) with their previously published spectral data. Antidiarrheal activity shows a percent reduction of diarrhea by 46.67% and 40%, respectively, for Chabamide I and Chingchengenamide A (at 20 mg/kg b.w.) compared with an 80% reduction by standard loperamide. Similarly, the percent reduction of writhing was 53.06% and 42.86%, respectively, for Chabamide I and Chingchengenamide A at similar doses compared with an 80% reduction by diclofenac sodium considered as standard. Both the alkaloids showed auspicious outcomes against test microorganisms during disk diffusion antimicrobial assay. Molecular docking and ADME/T analysis of the alkaloids also validate a potent pharmacological basis for the traditional utilization of P. chaba in treating diarrhea, pain, and microbial infection. These results emphasize the need to investigate P. chaba as a potential source of natural therapies for common health issues, laying the foundation for future research.

Background: Shirakiopsis indica (Willd)., commonly known as Sa-Mor-Ta-Lay in Thailand, is a mangrove plant belonging to the Euphorbiaceae family. As mangrove plants’ medicinal potentials are less explored, this study sought to qualitatively and quantitatively verify the bioactive components of Shirakiopsis indica fruits methanolic extract (SIF-ME) at the side of its analgesic, anti-inflammatory and anti-oxidant effects followed by in-silico studies. Methods: The in-vivo assessments of analgesic activity involved the hot plate test, acetic acid-induced writhing test, and formalin-induced licking test. The anti-inflammatory efficacy was assessed through the human RBC membrane stabilization assay (HRBC), protein denaturation assay, and xylene-induced ear edema methods. Antioxidant potential was implemented by the DPPH scavenging method. Results: The SIF-ME consistently displayed significant anti-nociceptive activity in a dose-dependent pattern (p < 0.05). The maximum analgesic activity was found in the highest dose (200 mg/kg; p < 0.001) in a hot plate, acetic acid-induced writhing test 43.47%, and in formalin-induced licking test in both early phase (43.3%; p < 0.01) and late phase (61.84%; p < 0.001%). The extract provided optimal protection against hemolysis (83.41% decrease) at 1000 μg/mL and significantly inhibited protein denaturation (67.34– 26.05%) at doses of 1000– 62.5 μg/mL. At 200 mg/kg, the extract showed dose-dependent and substantial inhibition (54.07%; p < 0.01) of xylene-induced ear edema. The in-vitro DPPH (IC₅₀ = 469.5 μg/mL) results showed remarkable scavenging activity and concentration-dependent reducing power. The extract demonstrates no acute oral toxicity, as indicated by an LD₅₀ value exceeding 1000 mg/kg body weight. Gas Chromatography-Mass Spectrometry/Mass Spectrometry (GC-MS/MS) analysis was performed which yielded sixty bioactive compounds. In-silico and molecular docking studies revealed favorable pharmacological properties, including good binding affinities and ADME/T profiles. Conclusion: These results support the medicinal use of the plant, which makes it a potential source of analgesic, anti-inflammatory, and antioxidant candidates.