Headspace solid-phase microextraction (HS-SPME) was used to isolate the volatile compounds, which are formed during peroxidation of fatty acids in vegetable oils. Isolated compounds were characterized by GC-MS and quantified using GC with FID detection. Four fibers for HS-SPME method development tested, divinylbenzene/carboxene/PDMS fiber selected as providing best detection analyzed compounds. Extraction curves, limits detection, repeatability, linearity investigated 14 aldehydes, ketones,...

Abstract BACKGROUND: Grapes are one of the world's staple fruit crops, with about 80% yield being utilised for winemaking. Since grape by‐products still contain large amounts secondary metabolites, uses other than as fertilisers might be appropriate. In this study, white pomace (WGP) was incorporated in wheat flour at levels 10, 20 and 30% (w/w) to investigate its influence on rheological, nutraceutical, physical sensory properties. RESULTS: Farinograph characteristics dough different WGP...

This article investigates the effect of green tea extract (GTE) on biscuits lipid fraction oxidative stability. The antioxidant activity GTE was compared with commonly used synthetic butylated hydroxyanisole (BHA). Biscuits were prepared in 3 variations. Control samples without addition antioxidants. other variations by adding BHA (0.02%) and at different levels: 0.02%, 0.1%, 1%. subjected to sensory studies instrumental chemical analysis. Phenolic compounds characterized powerful activities...

Summary The study evaluated the effect of grape by‐products (GP) on chemical composition, soluble (SDF) and insoluble (IDF) dietary fibre, phenolic compounds antioxidant activity (AA) organoleptic characteristics sourdough mixed rye bread. following samples bread were prepared: control (BC) breads with GP at four different levels: 4%, 6%, 8% 10%. Addition significantly improves fraction contents, as a 10% addition accounts for 39% 37% higher contents IDF SDF than BC. assay radical‐scavenging...

Abstract This work was aimed at assessing the effectiveness of electronic nose to monitor off‐flavor associated with lipid oxidation as a supplementary tool human sensory panel assessment. Therefore, correlations between and analysis were determined. Also GC analyses chemical oil samples run characterize analyzed well‐described parameters. Refined rapeseed subjected an accelerated storage test for 12 days 60 °C ambient temperature in which it stored retail plastic bottles up 6 months. PCA...

Geosmin and 2-methylisoborneolcompounds responsible for the musty-earthy off-odor of wheat grain, were isolated by SPME analyzed GC-MS. Carboxen/PDMS/DVB fiber coating was selected because its highest extraction efficiency. Concentrations geosmin 2-methylisoborneol as low 0.001 μg/kg detected in SIM mode using ion trap mass spectrometer. Apart from GC-MS determination 2-methylisoborneol, various methods evaluating caused these compounds grain are presented. Sensory profile analysis...

ABSTRACT: Fruits of transgenic cucumber lines expressing preprothaumatin II gene were evaluated concerning their aroma. Four homozygous lines, that is, 210 06, 212 01, 224 09, and 225 03 with different levels transgene expression selected. Recipient line cv. Borszczagowski, which was formed by inbred Cucumis sativus L., used as a control. The experiment carried out in greenhouse an outdoor experimental plot. aroma fruits GC/MS, well GC/MS/TOF the distillates SPME. Irrespective...

Summary The effects of extraction parameters on bioactive compound contents winemaking waste extracts (WWE) and its effect rapeseed oil oxidative stability were evaluated. Research showed that the total phenols anthocyanin antioxidant activity (AA) WWE significantly depended parameters. Increasing temperature (60 °C) time (5 h) an addition water to ethanol statistically improved rate active component extraction. HPLC analysis procyanidin B 2, catechin, gallic acid, γ ‐resorcylic acid p...

Abstract Species of kalanchoe are rich in bioactive compounds and widely used folk medicine; however, these plants not well known from the point view aroma. Two species, Kalanchoe pinnata daigremontiana , were examined after six months two years growth their vitamin C content, succulence, aroma composition determined. The efficiency juice extraction was highest (72%) for leaves K. growth. concentration juices two-year-old much higher (81 mg/100 g). SPME/GC/MS analysis identified 32...

Some studies have ascribed a protective effect against neurodegenerative diseases to the β-carbolines harman (H) and norharman (NH), which occur mostly in coffee substitutes. We determined concentrations of undesirable compounds (such as acrylamide) roasted substitute ingredients found that chicory was optimal. Two vivo experiments were conducted with seventeen-month-old male Sprague Dawley rats fed diet addition pure carboline standards first stage, second. observed an increase level H NH...

Abstract The rosemary aroma composition and the enanatiomeric ratio of chiral compounds were examined by GC (FID), GC/MS GC. Solid-phase microextraction (SPME) was for its suitability isolation volatiles from leaves five samples in comparison with traditional steam distillation procedure. Mostly components taken into consideration: 1,8-cineole, camphor, borneol, α-terpineol verbenone. Eight pairs enantiomers separated all analyzed samples: α-pinene, camphene, β-pinene, limonene, linalool,...

Abstract: Obesity and diabetes have led consumers to increasingly seek out products containing low‐calorie sweeteners. In this context, the intense sweeteners, especially plant proteins that interact with taste receptors, are playing a growing role. Among sweet‐tasting thaumatin seems most promising. Production of by transgenic plants might be an interesting alternative extraction product from natural source. Another possible application unusual properties is produce protein capable inducing...

Abstract Light quality is thought to affect the growth and development of plants. We examined how light influences content some chemical compounds in dill ( Anethum graveolens L .). The plants were grown under different quality. share orange green spectrum was constant amounted 10% for either colour. In first combination (A, 70/10), there 70% red blue light. Other combinations had following proportions: B 60/20, C 50/30, D 40/40 E 30/50 PPFD about 155 μmol m -2 s -1 . Blue inhibited...

BACKGROUND Chicory coffee is produced from traditional raw materials. Other materials are added to improve its aroma. The aim of this study was test new with a high content chlorogenic acid (CGA) as the criterion for their selection. This degraded in course roasting and source phenolic compounds affecting For reason, contents CGAs were analyzed before after compared chemicals formed roasted pure standard (5-CQA). RESULTS It shown that novel contained considerable amounts 5-CQA, frequently...

The evaluation of essential oil content and its composition in the herb lemon balm breeding strains was goal research, with aim selecting appropriate genotypes for further programs. In 2013–2014, at beginning flowering, collected from ten randomly selected plants eight bred nursery. estimated after hydrodistillation dried herb, accordance method recommended by European Pharmacopoeia VI; then subjected to gas chromatography. Both yield showed significant differentiation among investigated...