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Mostrando 13-24 de 207 artigos, teses e dissertações.
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13. Is it still worth Publishing Case Reports? They are Part of our Lives
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
Braz. J. Cardiovasc. Surg.. Publicado em: 2020-10
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14. Kinetic Parameters of the Thermal Oxidation and Degradation Reactions in Soybean Oil and Palm Olein
Partially hydrogenated soybean oil and palm olein are oils that are widely used in the food industry. Continuous contact with air may cause changes of the triglycerides chemical structure, to eventually produce substances of lower molar masses that may be toxic to mammals. This study aimed to determine the kinetic parameters for the thermal oxidation of thes
J. Braz. Chem. Soc.. Publicado em: 2020-10
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15. Effects of Soil and Vineyard Characteristics on Volatile, Phenolic Composition and Sensory Profile of Cabernet Sauvignon Wines of Campanha Gaúcha
The influence of vineyard on wines was evaluated for the first time using a broader analytical approach: sensory analyses and several analytical techniques (gas chromatography-mass spectrometry (GC-MS), GC flame ionization detection (FID), GC-olfactometry-Osme technique (GC-O-Osme), GC × GC-MS), taking into account odoriferous compounds of Cabernet Sauvigno
J. Braz. Chem. Soc.. Publicado em: 2020-06
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16. Optimization of extraction conditions of volatile compounds of roasted beef by solid-phase microextraction
Aroma is one of the most important sensory attributes for acceptance by beef consumers. The first step in analysing the volatile compounds associated with this attribute is their extraction from the food matrix, solid-phase microextraction has been widely used for volatile compound determination in meat. This study aimed to test six different solid-phase mic
Quím. Nova. Publicado em: 2020-04
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17. Optimization of New Sample Preparation Technique for the Determination of Methadone and Codeine in Plasma Sample by GC-FID
A continuous sample drop flow microextraction (CSDF-ME) technique was modified for the pretreatment of plasma samples in the determination of methadone and codeine. The limit of detection and linear range for methadone were 15.0 µg L-1 and 0.1-10.0 mg L-1, respectively. The detection limit and linear range for codeine were 25.0 µg L-1 and 0.2-15.0 mg L-1,
J. Braz. Chem. Soc.. Publicado em: 2020-03
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18. CALISTEGINAS, ALCALÓIDES POLIHIDROXILADOS PRESENTES EM HORTALIÇAS: FRUTOS E TUBEROSAS
Calystegines are nortropane alkaloids with three to five hydroxyl groups. These alkaloids are recognized as glycosidase inhibitors and thus may have therapeutic potential to be exploited. There are also reports of its possible toxic effects when they are present in foods. Commercial cultivars of human consumption in Brazil have been analyzed for calystegines
Quím. Nova. Publicado em: 2020-01
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19. A comparison of the volatile and phenolic compositions of Muscat of Bornova wines from two different terroirs in the Aegean region of Turkey
Abstract This study investigated the aromatic and phenolic compositions of two different Muscat of Bornova wines from two distinct terroirs (İzmir and Manisa) and compared them to basic terroir properties over the course of two consecutive years. The 53 volatile and 14 phenolic compounds found, were identified and quantified by GC-MS-FID and HPLC-DAD with M
Food Sci. Technol. Publicado em: 20/12/2019
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20. Encapsulation of flaxseed oil extract in alginate-salep system by ionic gelation
The objective of the current study was to encapsulate flaxseed oil extracted from finely grounded flaxseed powder and determined for its fatty acids content by GC/FID. Ionotropic gelation method was used to form beads containing 40% flaxseed oil with vitamin E being used as an antioxidant agent. The study employed calcium chloride solution as crosslinking ag
Braz. J. Pharm. Sci.. Publicado em: 20/12/2019
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21. Antimicrobial and antibiofilm activity of Cymbopogon flexuosus essential oil microemulsions
ABSTRACT The objective of the study was to determine the antimicrobial activity antibiofilm and to identify the main components of the essential oil (EO) obtained from the leaves of Cymbopogon flexuosus. The antibacterial and antibiofilm activity was determined against Staphylococcus aureus ATCC 29213, Pseudomonas aeruginosa ATCC 27853, Salmonella Typhimuriu
Rev. Ceres. Publicado em: 11/11/2019
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22. Evaluation of the Lipid Quality of Lyophilized Pasteurized Human Milk for Six Months by GC-FID and ESI-MS
Human milk (HM) lipids provide about 50% energy and facilitate the transport and absorption of fat-soluble vitamins for infants, but their composition should be studied when the milk is processed. This study evaluated the lipid quality of lyophilized and vacuum-packed colostrum (C), transitional (T), and mature (M) HM for a period of 1, 30, 60, 90, 120, 150,
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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23. Determination of methanol residues in crude glycerol for animal feed by gas chromatography
ABSTRACT: Crude glycerol is a major by-product of biodiesel production and is an economical additive feed for ruminants. However, residual methanol in crude glycerol can be harmful to animal health. Several methods exist for quantifying methanol residues in biodiesel, yet few have been described that identify the methanol level in crude glycerol. We propose
Sci. agric. (Piracicaba, Braz.). Publicado em: 30/05/2019
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24. Microscale direct transesterification of microbial biomass with ethanol for screening of microorganisms by its fatty acid content
Abstract We present an improved method of direct transesterification suitable for the quantitative analysis of multiple dry samples for its fatty acid content, using a minimal amount of biomass and reactants. The method features an acid-catalyzed direct alcoholysis of microgram samples of dry biomass; the rationale behind the solvent and reagent proportions
Braz. arch. biol. technol.. Publicado em: 15/04/2019