Volatiles are important quality components in tea (Camellia sinensis) flowers. Albino plants mutant with diverse abnormal metabolisms. However, whether the metabolisms of volatiles flowers from albino cultivars remains unclear. In this study, headspace solid-phase microextraction coupled to gas chromatography-mass spectrometry and aroma evaluation were conducted investigate volatile composition...

Abstract Monomeric C 6 -C 2 -type lignin model compounds with a p -hydroxyphenyl ( H ), guaiacyl G syringyl S or -ethylphenyl E ) nucleus (1-phenylethanol derivatives) were individually oxidized by MnO at pH of 1.5 and room temperature. The results compared those the corresponding 1 benzyl alcohol derivatives obtained in our recent report to examine effect presence β -methyl group on oxidation....

BACKGROUND The introduction of an heterogeneously catalyzed gold-based alcohol oxidation process of broad applicability using a clean primary oxidant would be highly desirable. Gold is non toxic and carbonyl and carboxyl compounds are widely used to produce medicines, plastics, colorants, paints, detergents, fragrances, flavors, and other valued functional products. RESULTS The sol-gel entrap...

Honeybees defend their colonies aggressively against intruders and release a potent alarm pheromone to recruit nestmates into defensive tasks. The effect of floral odours on this behaviour has never been studied, despite the relevance of these olfactory cues for the biology of bees. Here we use a novel assay to investigate social and olfactory cues that drive defensive behaviour in bees. We sho...

Aroma is an important quality characteristic in Muscat grapes and constitutes a major concern for viticulturist and grapevine breeders. For this reason, Muscat aroma variability was characterised in a segregating progeny and in a collection of table grapes, to assess the usefulness of the presence or absence of rose oxide for predicting Muscat genotypes. Simple tasting and an analysis of free a...

Introduction Tuta absoluta is currently considered one of the most devastating invasive pests solanaceous plants worldwide, causing severe damage to tomato industry. Insects use volatile organic compounds (VOCs) locate host plant for feeding and oviposition. Those VOCs could be developed as lures pest monitoring control. Methods In this study, differentially accumulated between preferred (tomat...

Copper- and cobalt-containing carbon composites were prepared by pyrolysis of an aniline-formaldehyde polymer (AFP) doped with the metal oxides, followed reduction cations in electrochemical cell. AFP + oxide nanocomposites synthesized introducing a salt during polycondensation aniline formaldehyde alkaline precipitation oxides into matrix. The heat treatment was carried out at 400, 500 700 °C....

Ageing on lees can be a good technique to enhance the quality of red sparkling base wines. Ultrasound treatment lees, prior addition wine, improve releasing their components into wine. This study carries out four month ageing wine by sonicated at different amplitude levels: 30%, 60% and 90% for 10 min. The ultrasound-treated improved with greater impact higher applied ultrasound. Sonicated an e...

The aim of this work was to analyze and compare the concentration higher alcohols, esters, acids in wines from Tempranillo Blanco. Blanco is a new little-studied white variety that originated by natural mutation. During three seasons, grapevines both varieties were harvested, nine made each. volatile composition determined GC-MS. In varieties, content alcohols than those esters acids. Wines had...