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Olive oil isolated from the fruits of the Olea europaea L. is an important part of Mediterranean diet. It is known for its diverse biological actions. Furthermore, a little amount of fixed oil and other bioactive components can also be extracted from the olive seeds which are considered as byproduct of olive oil extraction. Therefore, this study was designed to analyze the fatty acid composition and to perform in vitro biological studies on fixed oil isolated from olive seeds. The fixed oil was isolated from the olive seeds of Syrian and Greek black olive fruits by using Soxhlet apparatus. The purity was checked by measuring its refractive index. Composition of two isolated oils and a commercially available virgin olive oil was determined by preparing their Methyl esters (FAME) followed by GC-MS analysis. Various in vitro assay methods were used to investigate activities such as antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl (DPPH), cytotoxic activity by using Brine shrimps lethality bioassay and antimicrobial activity against two bacterial strains; Staphylococcus aureus and Escherichia coli by agar well diffusion method. GC-MS analysis revealed that the two isolated oils differ quantitatively in chemical composition with oleic acid identified as the major chemical constituent (62.6% and 73.56%). Both the fixed seed oils showed a concentration dependent DPPH radical scavenging activity ranging from 8 to 76% inhibition. The oils also exhibited excellent cytotoxic activity but no antimicrobial activity was observed. The chemical composition of the isolated fixed olive seed oil is found to be almost similar to the commercially available fruit olive oil. The fixed oil from the seeds of olive fruits possesses useful biological actions. Further studies are needed to isolate and quantify their bioactive constituents.

• Chemical profiling of Omani Thymus vulgaris species was done by GC-MS analysis. • The GC-MS analysis of thyme essential oil established it to be a carvacrol chemotype. • Thyme essential oil exhibited better antimicrobial spectrum than ampicillin. • Thyme essential oil showed significant in vitro free radical scavenging activity in DPPH assay method. • In silico PASS prediction studies revealed carvacrol to possess useful bioactivities including cytotoxicity. Thyme is an evergreen shrub that has been utilized in traditional medicine and culinary packages for centuries because of its aroma and medicinal properties. The medicinal properties of thyme leaves are attributed to its volatile constituents. The study aimed to identify the volatile constituents in the oil extracted from the Thyme sp grown in Oman and to evaluate its in vitro antibacterial and antioxidant activity. Fresh Thyme leaves were collected from Muscat, Sultanate of Oman in the month of September 2018. Thyme oil was isolated from leaves by hydro-distillation. The volatile chemical constituents present in the thyme oil were analyzed by Gas Chromatograph coupled with Mass Spectrometer. The ability of isolated oil to scavenge free radicals was evaluated by an in vitro DPPH assay method while antimicrobial activity was tested against S. aureus and E. coli bacterial strains by disc diffusion method. The bioactivity of the major constituent of the oil was predicted with the help of PASS and CLC-pred software. Molecular docking studies were performed by docking server. GC–MS analysis of thyme oil revealed the presence of 11 components. Carvacrol and γ-terpinene were identified as the major volatile constituents in thyme oil. Thyme oil inhibited 71.57% of DPPH radicals at 40 µg/mL concentration. Thyme oil displayed the better antimicrobial activity than the standard drug ampicillin against both the bacteria. Antiseptic, antiinfective, reductant and antimutagenic bioactivities of carvacrol as predicted by PASS support the in vitro experimental results. CLC-pred showed carvacrol to be active against Metastatic melanoma, Oligodendroglioma and Non small cell lung cancer cell lines. The antioxidant and antimicrobial activity of Omani thyme oil could be due to its high content of carvacrol. Omani thyme oil seems to be a viable alternative source of natural antimicrobial agent(s) and warrants further studies to ascertain its therapeutic spectrum of biological studies. [ABSTRACT FROM AUTHOR]

We report herein one-pot synthesis and the antibacterial and antitubercular activities of 2,5-disubstituted-1,3,4-oxadiazole compounds obtained by hybridization of a well-known antitubercular agent isoniazid ( INH) with four broad-spectrum antibiotics belonging to fluoroquinolone ( FQ) class. The work is aimed at designing and developing potential antimicrobial agents having synergistic action due to the coupling of INH and FQ through the biologically active 1,3,4-oxadiazole nucleus. The synthesized compounds are expected to have low toxicity as compared to INH due to the absence of free hydrazide group in the chemical structure of the prepared derivatives. The antibacterial activities of the 1,3,4 oxadiazole derivatives were also tested against several Gram-positive and Gram-negative pathogenic bacterial strains. The antitubercular activity was evaluated against M. tuberculosis H37Rv strain, and the results were compared with that of the positive control INH. The title compounds showed excellent antimicrobial and promising antitubercular activity in comparison to the parent fluoroquinolones and INH, respectively. [ABSTRACT FROM AUTHOR]

A small library of twenty-four quinoline based butenolides also known as furanones and their nitrogen analogues was prepared by using two different aroylpropionic acids, viz. 3-(2-naphthoyl)propionic acid ( 3 ) and 3-(biphenyl-4-yl)propionic acid ( 4 ), as starting materials. The 3-aroylpropionic acids were reacted with different 6-substituted-2-chloroquinolin-3-carbaldehydes ( 2a–d ) to obtain the corresponding furan-2(3 H )-ones ( 5a–h ). The purified and characterized furanones were then converted into their corresponding 2(3 H )-pyrrolones ( 6a–h ) and N -benzyl-pyrrol-2(3 H )-ones ( 7a–h ). The antimicrobial activities of the title compounds were evaluated against two strains of each Gram +ve ( Staphylococcus aureus and Bacillus subtilis ), Gram −ve bacteria ( Escherichia coli and Pseudomonas aeruginosa ) and against fungal strains of Aspergillus niger and Aspergillus flavus . In vivo anti-inflammatory potential of the title compounds was investigated by standard method. Majority of the compounds showed significant antibacterial activity against both the Gram +ve strains. Eight most potent anti-inflammatory compounds ( 5b, 5d, 5h, 6b, 7b, 7d, 7f, 7h) which exhibited >53% inhibition in edema, were also screened for their in vivo analgesic activity. All the tested compounds were found to have significant reduction in ulcerogenic action but only three compounds ( 5d, 5h and 7h ) showed comparable analgesic activity to standard drug, diclofenac. The results were also validated using in silico approach and maximum mol doc score was obtained for compounds 7a–h . On comparing the in vivo and in silico anti-inflammatory results of synthesized compounds, N -benzyl pyrrolones ( 7a–h ) emerged as the potent anti-inflammatory agents. It was also observed that compounds that possess electron withdrawing group such as Cl or NO 2 are more biologically active. [ABSTRACT FROM AUTHOR]

Background: The leaves of Sesbania grandiflora have been used in local traditional medicine since ancient times. In the present study we investigated, in vivo and in vitro, the potential health benefits of various fractions of the ethanolic extract of these leaves. Materials and methods: Crude ethanolic extract (CEE) of S. grandiflora leaves was partitioned into ethyl acetate soluble fraction (EASF), petroleum ether soluble fraction (PSF), carbon tetrachloride soluble fraction (CTSF), chloroform soluble fraction (CSF), and water soluble fraction (WSF). The extracts were evaluated for their thrombolytic, membrane stabilizing (anti-inflammatory), antimicrobial, and antidiarrheal activities. The results were compared to the effects of standard drugs: streptokinase for the thrombolytic, acetylsalicylic acid (ASA) for the membrane stabilizing, kanamycin for antimicrobial, and loperamide for the antidiarrheal activities. Results: For thrombolysis, EASF showed the highest % of clot lysis (59.6%) among all fractions, while streptokinase and water resulted in 69.2% and 3.1% clot lysis respectively. With respect to the membrane stabilizing activity, the EASF significantly inhibited the hemolysis of human erythrocytes induced by hypotonic solution (64.3±0.6%) or by heat (57.2±0.7%). The other fractions exhibited no membrane stabilizing effect. By contrast ASA resulted in 73.9±0.3% inhibition of osmotically induced hemolysis and a slightly lower level of inhibition in the case of heat-induced hemolysis (70.1±0.3%). The antidiarrheal activity was evaluated in the mouse model. The unfractionated, CEE reduced the number of defecation episodes by 25.0% at a dose of 200 mg/kg and by 41.1% at dose 400 mg/kg body weight. All extract fractions exhibited significant antibacterial activity, which was higher against Gram negative bacteria than Gram positive bacteria. Since the pharmacological activities of S. grandiflora are due to the presence of bioactive compounds we detected and quantified the presence of significant levels of flavonoid and tannin substances. Conclusion: Leaves of Sesbania grandiflora have the potential to be used as a remedy for thrombosis, diarrhea, and inflammatory diseases and against few important bacterial pathogens. [ABSTRACT FROM AUTHOR]