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Objective: To obtain a systematic record of the relative antioxidant activity of flavonoid and phenolic contents of Luffa echinata Roxb fruit and Nyctanthus arbor-tristis leaves extracts.

Methods: Phenolic and flavonoid content were determined by using gallic acid  and quercetin as standard, antioxidant properties were evaluated by the methods, namely the Trolox equivalent antioxidant capacity assay (TEAC), Oxygen radical absorbance capacity (ORAC) Assay and DPPH free radical scavenging activity assay.

Results: Total phenolic content were found 76.34±0.44 and 45.53±0.65 mg/g, while flavonoid contents were found 65.98±0.83 and 34.92±0.76 mg/g in Luffa echinata Roxb and Nyctanthus arbor-tristis respectively. In the Trolox equivalent antioxidant capacity assay, TEAC value were found 0.34 mmole/g and 0.28 mmole/g, while in Oxygen radical absorbance capacity assay, ORAC value was found 253.7m moles TE ^#/ g and 221.6 m moles TE ^#/ g, where as DPPH free radical scavenging activity assay showed IC₅₀ value 188±0.87 and 176±0.68 for Luffa echinata Roxb and Nyctanthus arbor-tristis extracts.

Aim: The main aim of our study is to isolate the active compound from roots of Plumbago zeylanica Linn. by bioactivity-guided isolation and evaluate its memory-enhancing effect by Morris water maze.Methods: Roots were extracted by successive solvent methods by petroleum ether, chloroform, methanol, butanol, and finally, water. Chloroform extract was selected for isolation, and plumbagin was isolated by hexane and ethyl acetate as solvent system. Plumbagin was evaluated by Morris water test, and brain acetylcholine esterase level was measured.Result: Plumbagin showed a significant decrease of escape latency and increase of time spent in target quadrant by mice in Morris water maze indicating improvement of learning and memory. It also significantly decreases the cholinesterase level in the brain.Conclusion: Learning and memory of mice doubtless may be through embarrassment of brain acetyl cholinesterase activity and through involvement of GABA-benzodiazepine pathway. Further detailed study is required to explore the other possible mechanisms for the management of cognitive disorders.

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In a study, the potential of hydroalcoholic and petroleum ether extract of Gloriosa superba Linn (GS) tubers in the mitigation of antisecretory and antiulcer was studied. Both extracts were tested at 100, 200, and 400 mg/kg/p.o. using ethanol, and cold stress as toxicants. Both the extracts showed significant ulcer protection at the highest dose of 400mg/kg as compared to standard drug lansoprazole. To support its antiulcer potential, the plant was examined for radical - scavenging capability by lipid peroxidation. The extracts showed a comparative significant result. The flavonoids & polyphenols in the extracts verify the antioxidant potential. From the results, it was concluded that both hydroalcoholic and petroleum ether extracts of tubers of Gloriosa superba are having gastric ulcer protective activity.