In this work, zinc glycerolate (ZnGly) is studied as a new catalyst for an environmentally friendly production of biodiesel. The solid was prepared by a simple procedure, characterized and studied in the transesterification of soybean oil with methanol.ZnGly was able to convert soybean oil into ...

Volatile organic sulfur compounds occuring during a bloom of different species of Microcystis in Lake Neusiedl, Austria, were analyzed by gas chromatography and mass spectrometry. In open water diisopropyl disulfide and diisopropyl tri-sulfide were the only sulphur compounds to be found. It was ...

A trisiloxane surfactant was synthesized with grafting butynediol ethoxylate onto hydrophobic heptamethyltrisiloxane. The structural analysis of this surfactant was done by 1H, 13C and 29Si NMR. The surface activity, adsorption kinetics, aggregation behaviors in aqueous solutions, and dynamic sp...

A series of butynediol-ethoxylate based polysiloxanes (PSi-EOs) with same composition but different lengths of siloxane backbone were designed and synthesized via hydrosilylation reaction. Their physicochemical properties and application performances have been discussed. With the increase of the...

Novel polysiloxane amphiphiles obtained by introducing coal-based amphiphiles (butynediol ethoxylate) into polysiloxanes based on hydrosilylation reaction by two steps: first, synthesizing hydride terminated polysiloxane with different degree of polymerization (HTP); second, butynediol-ethoxylat...

The existence of the discrete compounds phenylmercuric hydroxide, PhHgOH, and phenylmercuric oxide, (PhHg)2O, is shown by a combination of thermogravimetric analysis and infrared spectroscopy. The method is also shown to be applicable in distinguishing between triphenyltin hydroxide and oxide.

The effectiveness of incorporation of radioactivity from 14C-labelled monoterpenyl pyrophosphates into isothujone, 1,8-cineol and α-pinene formed

A cell free extract from orange flavedo forms phosphorylated derivatives of isopentenol, dimethylallyl alcohol and farnesol, as well as small amounts of hydrocarbons from 2-14C mevalonic acid. Isopentenyl pyrophosphate 4-14C is transformed into phosphorylated derivatives of dimethylallyl alcohol...

Hydrolysis of geranyl pyrophosphate is catalyzed by salts of Mn2+ and involves C-O bond cleavage. The first order rate constants reach limiting values with [Mn2+] > 10−2 M, and the most reactive species is GPP(Mn2+)2 at the optimum pH of 6.5–7. The products are similar to those from acid hydrol...

A soluble enzyme preparation from the flavedo of Citrus limonum transforms [1-3H1]neryl pyrophosphate or [1-3H1]geranyl pyrophosphate into β-pinene, sabinene, α-pinene, and limonene. The enzyme has been partially purified and stabilized by precipitation with polyethyleneglycol. The enzymic cyc...

A partially purified enzyme (carbocyclase) from the flavedo of Citrus limonum formed α-pinene, β-pinene, limonene, and γ-terpinene from geranyl pyrophosphate (GPP) and neryl pyrophosphate. The maximum specific activities obtained were 7.0 and 3.6 nmol/ min/mg, respectively. Cross-inhibition b...

Regiospecifically deuterated geranyl diphosphate, in concert with NMR spectrometry, was employed to demonstrate that the trans-methyl group (C8) of geranyl diphosphate becomes the C9 carbon of (+)-bornyl diphosphate (geminal methyl syn to the diphosphate moiety) and that the cis-methyl group (C9...

Cell-free extracts from carrot and peppermint catalysed enzymatic trans-cis isomerization of geraniol and geranyl phosphate to nerol and neryl phosphate, respectively, in the presence of a flavin, a thiol or sulfide and light. Partial reduction of the flavin prior to incubation allowed the react...

The tightly coupled nature of the reaction sequence catalyzed by monoterpene synthases has prevented direct observation of the topologically required isomerization step leading from geranyl diphosphate to the enzyme-bound, tertiary allylic intermediate linalyl diphosphate, which then cyclizes to...

Chitosan-gold collapse gel (CS-Au CG) was prepared by reducing chloroauric acid (HAuCl4) with a polysaccharide, chitosan (CS), in the absence of chemical and physical agents. CS-Au CG was used for the first time as a suitable nano-biocomposite sensing film for efficient one-step electrochemical ...

Inulin is a kind of renewable and biodegradable carbohydrate with good water solubility and numerous physiological functions. For further utilization of inulin, chemical modification can be applied to improve its bioactivities. In this paper, five novel inulin derivatives were synthesized via ch...

The ability of phosphonium cations to act as intracellular transport vectors is well-established. Previous research has demonstrated that phosphonioalkylthiosulfate zwitterions, and ω-thioacetylalkylphosphonium salts are useful precursors for the formation of phosphonium-functionalised gold nan...

Phosphonium ylide complexes of Mo and W formulated as [M(η3-allyl){η2-(NPh)2CH}(CO)2(CH2PR3)] (M = Mo, R = Me: 2a-Mo; M = Mo, R = Ph: 2b-Mo, and M = W, R = Me: 2a-W) were prepared by the reaction of amidinato(pyridine) complex, [M(η3-allyl){η2-(NPh)2CH}(CO)2(NC5H5)] (M = Mo: 1-Mo and M = W: ...

gem-Difluorinated phosphonium salts, generated from aldehydes and difluorinated phosphobetaine reagent, were converted into corresponding silicon reagents. The reductive silylation of carbon-phosphorus bond is carried out using a combination of magnesium and chlorotrimethylsilane in dimethylform...

The synthesis of a series of bifunctional Gd(III) complexes 1–3 covalently bound to arylphosphonium cations possessing a varying degree of delocalisation at the phosphonium centre is presented. The influence of the degree of delocalisation was investigated with regards to in vitro cytotoxicity,...