Results 21 to 30 of about 7,030 (197)
Química Nova, 2009 Isoamyl butyrate production was investigated using free and immobilized lipases by esterification of butyric acid with isoamyl alcohol in a solvent-free system and in an organic media.
Vitor Cardoso Aragão +6 more
doaj +1 more source
EFSA Journal, Volume 17, Issue 5, May 2019., 2019 Abstract The Panel on Food Additives and Flavourings of the European Food Safety Authority was requested to deliver a scientific opinion on the implications for human health of the product Grill flavour concentrate (vegetable) [FL‐no: 21.002] in the Flavouring Group Evaluation 501 (FGE.501), according to Regulation (EC) No 1331/2008 and Regulation (EC)
EFSA Panel on Food Additives and Flavourings (FAF) +25 more
wiley +1 more source
Chemical defense of Hymeniacidon heliophila (Porifera: halichondrida) against tropical predators
Brazilian Journal of Oceanography, 2010 Various benthic organisms have chemical defenses which reduce their predators' consumption. Although their efficiency may be noticed in many organisms, many of their effects are not well- known yet.
Suzi Meneses Ribeiro +4 more
doaj +1 more source
Design and Synthesis of an Indole‐Estrogen Derivative
Journal of Chemistry, Volume 2014, Issue 1, 2014., 2014 There are several methods reported for synthesis of aromatic‐condensed derivatives; nevertheless, expensive reagents and special conditions are required. Therefore, in this study, an indole‐estrogen derivative (3‐[4‐(2‐butyl‐3‐cyclohexylimino‐4‐piperidin‐1‐yl‐cyclobutylidencarbamoyl)]‐phenoxy‐NH‐indolo[2′,3′:17,16]estra‐1,3,5(10)triene) was synthesized
Figueroa-Valverde Lauro +7 more
wiley +1 more source
Educación Química, 2018 Sidney Young (1857-1937) fue un pionero de la separación y especificación de compuestos orgánicos puros y desarrolló relaciones termodinámicas clave entre sólidos y líquidos. En particular, estudió el dominio PTV de sustancias puras y demostró que bajo
Jaime Wisniak
doaj +1 more source
Ingenium, 2014 El artículo presenta los datos experimentales del equilibrio líquido-vapor del sistema binario n-hexano-ciclohexano a 760 mmHg de presión y su posterior separación por destilación fraccionada, empleando dos columnas diferentes, una de anillos Rasching, otra tipo Vigreux.
Grey Cecilia Castellar Ortega +2 more
openaire +1 more source
infoANALITÍCAEn este estudio, se empleó el diseño experimental simplex reticular aumentado (SRA, por sus siglas en inglés) para ajustar la ecuación matemática que modela el rendimiento de la extracción de astaxantina a partir del exoesqueleto de ...
Carlos Brito D. +3 more
doaj +1 more source
Brazilian Journal of Oceanography, 2010 Defensive chemistry may be used against consumers and competitors by invasive species as a strategy for colonization and perpetuation in a new area. There are relatively few studies of negative chemical interactions between scleratinian corals.
Bruno G. Lages +4 more
doaj +1 more source
Transferencia de materia hacia la solución en la extracción de productos bioactivos de vegetales y su degradación en mezclas de solventes [PDF]
, 2008 A quantitative analytic evaluation of the extraction of the natural antimalarial drug artemisinin, in wild plants of Artemisia annua L., using mixtures of ethanol 70% (v/v)-water has ben carried out.
Cafferata, Lázaro F. R. +2 more
core
Métodos cromatográficos para la determinación de endosulfán en alimentos [PDF]
, 2018 Artículo de revisión sobre las técnicas de extracción, limpieza y cualificación de endosulfán y sus isómeros de muestras alimentarias.Se revisaron las técnicas de extracción, limpieza y cuantificación de endosulfán por métodos cromatográficos en matrices
AMAYA CHAVEZ, ARACELI +7 more
core +1 more source