• Dihydrostilbene glycosides and lignan from Camellia sasanquaDihydrostilbene glycosides and lignan from Camellia sasanqua

    Three dihydrostilbene glycosides, 3,5-dihydroxydihydrostilbene 4′-O-β-D-glucopyranoside (1), 3,5- dimethoxydihydrostilbene 4′-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside (2), 5,4′-dihydroxydihydrostilbene 3-O-β-D-glucopyranoside (3), and one lignan, nudiposide (4) were isolated from the methanol extract of leaves of Camellia sasanqua Thunb. ...

    pdf5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 261 | Lượt tải: 0

  • Characteristics of hydroxyapatite coating on Ti-6Al-4V substrate fabricated via sequent H₂O₂-oxidizing and RF-sputtering processesCharacteristics of hydroxyapatite coating on Ti-6Al-4V substrate fabricated via sequent H₂O₂-oxidizing and RF-sputtering processes

    In this study, we created a hydroxyapatite (HAp) coating layer on top of the Ti-6Al-4V substrate via sequent H2O2- oxidizing and RF-sputtering processes and determining the effect of H2O2-oxidizing state to the adhesion between HAp coating layer and Ti-6Al-4V substrate. The results showed that the H2O2-oxidized Ti-6Al-4V surface is rough and por...

    pdf7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 299 | Lượt tải: 0

  • Substituent effects on the antioxidant capacity of monosubstituted diphenylamines: A DFT studySubstituent effects on the antioxidant capacity of monosubstituted diphenylamines: A DFT study

    There are undesirable effects leading to considerable changes in the properties of polymers and plastics since exposing to oxygen undergo oxidative degradation. Therefore, investigation of the bond dissociation enthalpies (BDEs) of NH bond for a series of monosubstituted diphenylamines is great interest. In this study, DFT-based method B3P86/6-...

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  • Secondary metabolites from a marine sponge-associated fungus Xenomyrothecium sp. IMBC-FP2.11Secondary metabolites from a marine sponge-associated fungus Xenomyrothecium sp. IMBC-FP2.11

    In the study, seven compounds were isolated from an EtOAc extract of the marine-derived fungal strain Xenomyrothecium sp. IMBC-FP2.11, including (3R,4R)-4-hydroxymellein (1), (3R,4S)-4-hydroxymellein (2), trans-3,4- dihydro-3,4,8-trihydroxynaphtalen-1(2H)-one (3), (3S)-6-hydroxy-8-methoxy-3,5-dimethyl-isochroman (4), 8-hydroxy- 6-methyl-9-oxo-9H...

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  • Phenolic compounds from Trigonostemon honbaensis and their cytotoxic activityPhenolic compounds from Trigonostemon honbaensis and their cytotoxic activity

    Seven phenolic compounds including (±)-erythro-1-(3,4,5-trimethoxyphenyl)propane-1,2-diol (1), (±)-threo-1- (3,4,5-trimethoxyphenyl)propane-1,2-diol (2), (R)-3-3-(3,4-dimethoxyphenyl)propane-1,2-diol (3), (±)-3-(3,4,5- trimethoxyphenyl)propane-1,2-diol (4), (+)-syringaresinol (5), (7S,8R,8′R)-5,5′-dimethoxylariciresinol (6), juniperosi...

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  • A new xanthone from the lichen Parmotrema praesorediosum (Parmeliaceae)A new xanthone from the lichen Parmotrema praesorediosum (Parmeliaceae)

    Two xanthone compounds, praesorexanthone A (1) and praesorexanthone B (2), were isolated from the lichen Parmotrema praesorediosum (Nyl.) Hale (Parmeliaceae). Among them, praesorexanthone B is a new natural compound. Their chemical structures were unambiguously determined by the analysis of 1D and 2D NMR and high resolution ESI mass spectroscopi...

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  • Chemical composition of pyrolysis oil through thermal decomposition of sugarcane biomassChemical composition of pyrolysis oil through thermal decomposition of sugarcane biomass

    The process of thermal decomposition of sugarcane biomass consists of 4 stages. On that basis, the research conducted the pyrolysis of sugarcane biomass to collect liquid products at different temperature stages and they were analyzed by GC-MS method to determine the chemical composition. Chemical composition of pyrolysis oil through thermal dec...

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  • Development of Green protocols for the synthesis of 1H-benzo[d]imidazolo aryl amide derivatives and evaluation of their biological activityDevelopment of Green protocols for the synthesis of 1H-benzo[d]imidazolo aryl amide derivatives and evaluation of their biological activity

    Benzimidazole scaffold containing chemical derivatives show superior biological activity. In view of this, we synthesized a combination of benzimidazole and aryl amides. The target compounds (6a-j) were synthesized using ethyl 3-iodobenzoate and benzimidazole as starting materials under microwave conditions. The synthesized compounds were screen...

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  • Compatibility of epoxidized natural rubber and polyaniline blendCompatibility of epoxidized natural rubber and polyaniline blend

    The compatibility of binary blend of epoxidized natural rubber and polyaniline was investigated. Epoxidized natural rubber with 25 mol% of epoxy group content was prepared through epoxidation of deproteinized natural rubber in latex stage. Blends of epoxidized natural rubber and polyaniline with various ratios were prepared. The compatibility of...

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  • Sulfanilic acid catalysed one-pot three-component Mannich reaction for synthesis of β-amino ketonesSulfanilic acid catalysed one-pot three-component Mannich reaction for synthesis of β-amino ketones

    We have reported sulfanilic acid as an exceedingly competent catalyst for one-pot Mannich reaction to give β- amino carbonyl compounds in good to excellent yield within a short reaction time. The various organic acids have screened; like gallic acid, 4-hydroxy benzoic acid, 4-amino benzoic acid, phenylacetic acid, chloroacetic acid, sulfosalicyl...

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