The volatile compounds responsible for the flavour of Australian-grown ginger have been extracted using supercritical carbon dioxide. Both fresh and dried samples examined major effects drying process are a reduction in gingerol content, an increase terpene hydrocarbons conversion some monoterpene alcohols to their corresponding acetates. © 2000 Society Chemical Industry

5-hydroxymethylfurfural (HMF) is a suitable platform chemical for the production of useful chemicals and fuels. This study examined hydrolysis mixtures sucrose, glucose fructose (synthetic sugar cane molasses) industrial molasses using sulfonated carbon-based heterogeneous catalysts derived from bagasse (B-SO3H) (M-SO3H). Microwave heating at 150 °C 4 h produced 39 mol % HMF yield with B-SO3H on synthetic solution. The addition pretreatment step, as well as, increasing microwave power was...

Lignin depolymerization to dicarboxylic acids (DCAs) by the one-step Fenton oxidation process results in poor yield and significant amounts of residual solids. A based on use sodium percarbonate bagasse lignin was conducted at 60–300 °C, for 1–6 h. This approach resulted significantly higher DCA yields (predominantly oxalic, malonic, succinic acids), without formation char, when compared acidic H2O2/chalcopyrite process. part due effectiveness alkaline reaction medium suppressing thermal...

An oxidation–hydrogenation process using atmospheric O₂ has been developed to convert native bagasse lignin into bio-aromatic esters in a single step.

Abstract The volatile compounds responsible for the flavour of Australian‐grown ginger have been extracted using supercritical carbon dioxide. Fluid densities above 0.8 g ml −1 result in co‐extraction significant amounts triglyceride material. Analysis extract by GC‐MS indicates that major components are neral and geranial, zingiberene, α‐bisabolene β‐sesquiphellandrene which together account 73% extract. low concentration gingerol degradation products attests to mild nature extraction procedure.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of volatile compounds in ripening kiwi fruit (Actinidia chinensis)John P. Bartley and Alan M. SchwedeCite this: J. Agric. Food Chem. 1989, 37, 4, 1023–1025Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https://pubs.acs.org/doi/10.1021/jf00088a046https://doi.org/10.1021/jf00088a046research-articleACS PublicationsRequest reuse permissionsArticle...

A major challenge that must be overcome for the commercial production of levulinic acid from lignocellulosics is to reduce equipment blockage and corrosion. Methanesulfonic (MSA), a relatively low corrosive acid, was used produce organic acids furfural pretreated sugarcane bagasse. In general, type pretreatment did not affect yield, though it affected yield. However, soda bagasse produced highest yields (∼75 mol%) (∼85 mol%), albeit under optimized conditions. Hydrolysis residue consists...

Volatile constituents of Vitex negundo leaves growing in Dehra Dun (India) were analysed by gas chromatography-mass spectrometry (GC-MS) and showed the presence sixty-six compounds. Such a study has not been done earlier on Indian oil. Thirty-five compounds, constituting 74.96% oil, identified. The main compounds are viridiflorol (19.55%), beta-caryophyllene (16.59%), sabinene (12.07%), 4-terpineol (9.65%), gamma-terpinene (2.21%), caryophyllene oxide (1.75%), 1-oceten-3-ol (1.59%), globulol...

Abstract Background: Bacterial biofilms have been implicated in the pathogenesis of chronic rhinosinusitis. In laboratory setting, ultrasound is effective disrupting such biofilms; however, few clinical studies evaluated role therapeutic Objective: This study was performed to investigate short-term effectiveness as a treatment modality for Methods: Twenty-two patients with positive history rhinosinusitis, according criteria set out by Rhinosinusitis Task Force, together previous computed...

Barley polyphenols were isolated using acetone/water (70/30) followed by Sephadex LH-20 chromatography. HPLC/Electrospray mass spectrometry showed the presence of proanthocyanidin dimers, trimers, tetramers, and pentamers. HPLC/electrochemical detection was used to survey contents these compounds in a range barley varieties. Principal components analysis that naked varieties Morrell, lesser extent Namoi, different from other Beer polyphenol extracts prepared A large number dimers trimers...

ABSTRACT The composition of the essential oil Chenopodium ambrosioides L. was analyzed by capillary GC and GC/MS. Forty-nine compounds were identified accounting for 96.86% oil. major limonene (32.5%) trans-pinocarveol (26.7%).

ABSTRACT The volatile constituents of the “Bowen” mango ( Mangifera indica , Kensington Pride) have been isolated by concentration head‐space vapors on Tenax‐GC. major components in ripe fruit are ethyl butanoate and terpinolene, although a number other esters terpenes present smaller amounts. was markedly decreased when were simultaneous distillation‐extraction method is, therefore, considered to be less useful than headspace concentration. As is allowed ripen storage decreases accompanied...

Complexes of the type [M(phen)3](PF6)2 (M = Ni(II), Fe(II), Ru(II) and phen 1,10-phenanthroline) were found to co-crystallize form molecular alloys (solid solutions molecules) with general formula [MAxMB1–x(phen)3](PF6)2·0.5H2O in which relative concentrations metal complexes crystals closely match those crystallizing solution. Consequently, composition co-crystals can be accurately predicted controlled by modulating Although they are chemically structurally similar, [M(bipy)3](PF6)2 bipy...

Methyl excision repair deficient human tumor cells (Mer-) were found to be hypersusceptible killing by the antimelanoma agent fotemustine (FM) implicating alkylation of O6 guanine as major contributor toxicity. Preincubation drug in aqueous solution for 5 min resulted an immediate reduction cytotoxicity (35−50%), vitro DNA (31%), and interstrand cross-linking (40%) followed a second reaction with considerably slower kinetics. Electrospray ionisation mass spectrometry (ESI-MS) showed that FM...

Abstract The preparation of alginate hydrogel membranes by the film immersion method was optimized for maximum crosslinking using swelling measurements as an indicator degree crosslinking. variables investigated were concentration nonsolvent (ethanol) sodium alginate, water‐soluble carbodiimide (WSC) concentration, and pH medium. Optimum conditions resulted when medium contained 60 vol % ethanol 100 m M WSC at 4. Membranes prepared different concentrations (100 WSC, 4) (60 ethanol, infrared...

The physicochemical properties of eight extracellular proteinases secreted by psychrotrophic bacteria dairy origin have been studied. Seven these were able to withstand ultra heat treatment (UHT) with D values at 140 degrees C ranging from 2 300 s. six Pseudomonas fluorescens glycoproteins mol. wt 47000-49500. two Serratia marcescens proteinases, 51000, did not contain carbohydrate but in other respects similar the proteinases. inhibited various metal chelators and all contained Ca Zn...