If dichloromethane is swapped out and ethyl acetate is used in its place, the extracts then obtained would be highly anti-radical and would be more efficient than dichloromethane.
Since "like dissolves like," ethyl acetate is a polar molecule that works well as a solvent to extract the polar caffeine molecules from coffee beans. The ethyl acetate molecules bind to the caffeine molecules, which then move through the bean cells' cell membranes. After all, the ethanol:water (1:1) solvent combination has been demonstrated to be the best for recovering catechins and delivering extracts with the highest antiradical activity.
Dichloromethane is a volatile colourless liquid used as an organic solvent in many industries. One of its main application is that it used to extract caffeine because of its highly effective solvent nature. Because DCM is a non-polar solvent and caffeine is readily soluble in DCM, it can easily be extracted without losing its aroma.
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Based on the given symptoms above, most likely, what Kerry is suffering from is DEPRESSION and this is why he needs to see his counselor in order to seek some help with his current condition. When someone is suffering from depression, the most common signs include being uninterested in activities, loss of appetite, and even difficulty sleeping. Hope this helps.
Por ello el lenguaje oral, al desarrollarse a un nivel subconsciente, no requiere esfuerzo. Esta característica es inherente al ser humano, y es lo que lo diferencia de los animales. Si un bebé está sano y es expuesto a un entorno hablante, es casi imposible para él no percibir el lenguaje, es decir, no aprender a hablar. Los niños que presentan dificultades en el lenguaje oral, tienen una dificultad específica del lenguaje.
El lenguaje escrito, a diferencia del lenguaje oral, no es natural sino arbitrario, requiere de la enseñanza (de la intervención de otro ser humano) y no sólo de la exposición a un entorno lectoescrito, y no se encuentra determinado genéticamente en el cerebro. El cerebro posee módulos aptos para aprender a leer y escribir el lenguaje oral, pero necesita de la intervención humana para activarlos a través de la enseñanza explícita y luego de práctica del circuito cerebral para su automatización. Es decir, necesita aprender en forma consciente cómo funciona el sistema, lo cual demanda una importante carga cognitiva y requiere de esfuerzo. Con la práctica, el cerebro es capaz de automatizar el proceso de lectoescritura y llevarlo a un nivel subconsciente.
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