This study aimed to evaluate the antioxidant, antiarthritic, and anti-inflammatory properties of extracts from the leaves of twelve different medicinal plants in Nepal. We then evaluated the total phenolic, flavonoid, and tannin contents of the extract using in-vitro assays and characterized it using GC-MS analysis. Results revealed that most of the leaf extracts contained phenolic compounds, flavonoids, tannins, alkaloids, and saponins. Few plants also showed the presence of glycosides, phytate, and vitamin C. Among the studied plants, Neolamarckia cadamba exhibited the highest total phenolic and tannin contents, as 241.530.20µg of gallic acid equivalent/mg and 74.481.081µg of tannic acid equivalent/mg, respectively. Ipomoea batatas exhibited the highest total flavonoid content, as 53.0511.11µg of quercetin equivalent/mg. Moreover, Raphanus sativus demonstrated significant ferrous ion chelating, 2,2-diphenyl-1-picrylhydrazyl, hydrogen peroxide scavenging, and total antioxidant activities with IC₅₀ value of 4.760.68µg/mL, 5.840.14µg/mL, 6.890.16µg/mL, and 8.990.20µg/mL, respectively. Similarly, Colocasia esculenta and Cicer arietinum exhibited the highest hydroxyl radical and nitric oxide scavenging activities, measuring IC₅₀ value of 7.220.56µg/mL and 9.060.10µg/mL, respectively. Among all the extracts, Amorphophallus paeoniifolius displayed significant human red blood cell (HRBC) membrane stabilization activity (IC₅₀=6.220.78µg/mL). Furthermore, Raphanus sativus, Chenopodium album, Cicer arietinum, and Murraya koenigii exhibited the highest inhibitory activities against protein denaturation with bovine serum albumin, antiarthritic, lipoxygenase inhibitory, and proteinase inhibitory, measuring IC₅₀ of 7.480.48µg/mL, 9.441.62µg/mL, 14.671.94µg/mL, and 28.572.39µg/mL, respectively. In conclusion, this study demonstrated the twelve leaf extracts significant antioxidant, antiarthritic, and anti-inflammatory activities.

Trichosanthes dioica fruit pericarp has a powerful hypolipidemic and antioxidant properties. Wistar rats were divided into five groups (n = 30). The normal control group received vehicle and standard diet throughout the experimental period. Groups II, III, IV, and V were given a high‐fat diet and free access of water for 21 days. Experimental groups IV and V were given high‐fat diet along with T. dioica extract 400 and 800 mg/kg, respectively. Blood was collected at 21 days, and lipid profile estimation was performed. The phytochemical screening was performed by different phytochemical screening methods. Lipid peroxidation and catalase activity were done by taking a liver tissue sample. The phytochemical screening of extract showed good results and indicated the presence of phytoconstituents in extract. 2,2‐Diphenyl‐1‐picrylhydrazyl scavenging activity of T. dioica was found to be 65.79% at a concentration of 100 μg/ml extract, whereas that of the control was 94.06%. The Wistar rats fed with a high‐fat diet with T. dioica showed a significant decrease in total cholesterol (TC), triglycerides (TG), very‐low‐density lipoprotein (VLDL), and low‐density lipoprotein (LDL) levels and an increase in high‐density lipoprotein (HDL) level. The lipid peroxidation and catalase activity of methanol extract of T. dioica were significantly reduced with individual comparison with all groups. The methanol extract of T. dioica has the hypolipidemic effect, which showed a decrease in TC, TG, VLDL, and LDL levels and an increase in HDL level in Wistar rats. It also has antioxidant properties. In this study, we have evaluated the antioxidant and the antihyperlipidemic activities of T. dioica in high‐fat diet induced hyperlipidemia in Wistar rats.

The aim of this study was to identify the bioactive phytoconstituents present in the aqueous extract of Nigella sativa and also, to evaluate the antioxidant and antihyperlipidemic activity in Wistar rats. The LC‐MS/MS analysis was assessed for the determination of different bioactive compounds present in N. sativa extract. Total phenolic and flavonoid content were determined by using validated Folin‐Ciocalteu and Aluminum chloride colorimetric methods, respectively. The in‐vitro antioxidant and in‐vivo antihyperlipidemic activity in Wistar rats were also evaluated. Preliminary phytochemical screening of the extract showed the presence of alkaloids, flavonoids, phenols, glycosides, and amino acids in the aqueous extract. The bioactive compounds of the aqueous extract were identified through LC‐MS/MS analysis. The in‐vitro antioxidant activity of N. sativa showed the highest free radical scavenging capacity in DPPH, H₂O₂, and OH radical scavenging assays with IC₅₀ values 11.916 ± 2.828, 30.294 ± 13.790, and 12.048 ± 2.828 µg/mL, respectively. Evaluation of antihyperlipidemic activity of extract in Wistar rats showed that a high dose (800 mg/kg) of extract significantly decreased total cholesterol (TC) 71.76 ± 6.91 mg/dL, TG 83.6 ± 8.09 mg/dL, low‐density lipoproteins (LDL‐c) 33.86 ± 6.05 mg/dL, very low‐density lipoproteins (VLDL‐c) 16.72 ± 1.61 mg/dL level in blood. However, the HDL‐C level was significantly improved (21.18 ± 1.80 mg/dL) as compared to HFD‐induced control rats (11.76 ± 1.14 mg/dL) after 28 days of treatment. Also, at the same dose, animal body weight was also decreased to 162.6 ± 16.40 g compared with control 184.4 ± 10.24 g. The aqueous extract of N. sativa was found to be an effective natural source of antioxidant and hypolipidemic agents. This activity was attributed to the presence of diverse bioactive compounds in it.

Ischemia-reperfusion (I/R)-related disorders, such as stroke, myocardial infarction, and peripheral vascular disease, are among the most frequent causes of disease and death. Tissue injury or death may result from the initial ischemic insult, primarily determined by the magnitude and duration of the interruption in blood supply and then by the subsequent reperfusion-induced damage. Various in vitro and in vivo models are currently available to study I/R mechanism in the brain and other tissues. However, thus far, no in ovo I/R model has been reported for understanding the I/R mechanisms and for faster drug screening. Here, we developed an in ovo Hook model of I/R by occluding and releasing the right vitelline artery of a chick embryo at 72 h of development. To validate the model and elucidate various underlying survival and death mechanisms, we employed imaging (Doppler blood flow imaging), biochemical, and blotting techniques and evaluated the cell death mechanism: autophagy and inflammation caused by I/R. In conclusion, the present model is useful in parallel with established in vitro and in vivo I/R models to understand the mechanisms of I/R development and its treatment.

Severe acute respiratory syndrome coronavirus‐2 (SARS‐CoV‐2) affects millions of people worldwide. The article aims to review the therapeutic perspective on natural antioxidants, their mechanism of action, pharmacokinetics in management and cure of COVID‐19/ SARS‐CoV‐2 infection. We conducted a literature search including World Health Organization and National Institute of Health guidelines and clinical trials registered with ClinicalTrials.gov limited to antioxidants in COVID‐19 management. Elderly, immunocompromised patients, and others with underlying health conditions or multiple comorbidities have a high mortality rate. Disrupted redox homeostasis and oxidative stress seem to be biological pathways that may increase personal vulnerability to infection. Antioxidants like vitamins C, D, E, epigallocatechin‐3 gallate, and morin have been reported to protect against COVID‐19 disease. Reactive oxygen species are immunological regulatory elements of viral replication. Natural antioxidants exhibit potential action in preventing inflammation and organ dysfunction during viral infection. They also increase glutathione level, oxygenation rate, and immunological responses in the treatment of sepsis and acute respiratory distress syndrome. No wonder the selection of prevention, treatment, and cure of COVID‐19 and SARS‐CoV‐2 mainly depends upon the antiviral and immunoregulatory activity which they possess. Yet, their efficacy against COVID‐19 is of great concern and demands extensive study.

The consumption of green juice of Barley and wheat grass is widely increases because of its therapeutic benefits. The study aimed to investigate phytochemicals and evaluate the antioxidant and antidepressant activity of aqueous extract of barley and wheat grass. This study included phytochemical screening, evaluation of antioxidant and antidepressant activities. Four groups consisting of six mice in each group. Negative control with stressed induced mice; imipramine group (100 mg/kg), barley and wheat extract group (400 mg/kg) respectively. Forced swim, tail suspension and elevated plus maize test were carried out to evaluate the antianxiety and antidepressant activity. Phytochemical screening of barley and wheat grass extract showed secondary metabolites such as alkaloids, Saponin, Tannins, Phenolic, Carbohydrate, Glycosides, Flavonoids, and Proteins. The mean total phenolic content of aqueous extract of barley and wheat grass was 160.996 ± 0.656, 135.63 ± 1.184 mg equivalent of GAE/g respectively. The total flavonoid content of aqueous extract of barley and wheat grass was 153.42 ± 0.40, 133.14 ± 0.43 mg equivalent of quercetin/g respectively. The extracts were proved to be an effective radical scavenger in all antioxidant assays. Forced swim and tail suspension test showed a significant (∗p < 0.05 and ∗∗p < 0.01) decrease in an immobility time. In elevated plus maize, there was a significant (∗∗p < 0.01) increase in average time spent on the open arm of the extract-treated group as compared to the negative control. It shows that barley and wheat grass extract has antidepressant effect.