Contribution to the geomorphologic knowledge of sa Dragonera islet (Balearic Islands, western Mediterranean)

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Food aroma mass transport properties in renewable hydrophilic polymers

[EN] The sorption and transport properties of gliadin and chitosan films with respect to four representative food aroma components (ethyl caproate, 1-hexanol, 2-nonanone and α-pinene) have been studied under dry and wet environmental conditions. The partition coefficients (K) of the selected volatiles were also obtained using isooctane and soybean oil as fatty food simulants. The results showed that gliadin and chitosan films have very low capacities for the sorption of volatile compounds, and these capacities are influenced by the nature of the sorbate, the environmental relative humidity and the presence of glycerol as a plasticizer in the polymeric matrix. The volatile compounds also present a low partitioning in the biopolymer film/food stimulant system. Given the low levels of interaction observed with the volatiles, gliadin and chitosan films are of potential interest for the packaging of foods in which aroma is one of the most important quality attributes Highlights ► Sorption kinetics and equilibrium partitioning of food aroma compounds in bioplastics. ► Gliadin and chitosan films show low sorption and partitioning capacities of food aroma compounds. ► Sorption and diffusion depend on volatile chemical structure, film composition and moisture. ► Great potential in packaging of foods in which aroma is an important quality attribute.This research has been supported from the Spanish Ministry of Science and Innovation through the Projects AGL2006-02176, AGL2009-08776 and FUN-C-FOOD Consolider Ingenio. The authors would like to thank A.P. Mac Cabe for critical reading of the manuscript.Balaguer, MP.; Gavara Clemente, R.; Hernández Muñoz, P. (2012). Food aroma mass transport properties in renewable hydrophilic polymers. Food Chemistry. 130(4):814-820. https://doi.org/10.1016/j.foodchem.2011.07.052S814820130

El litoral de Mallorca: síntesis geomórfica

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Cavitats litorals de gènesi marina a les illes Balears

[eng] Littoral caves can be found at the erosion coasts of the Balearic Islands. The genesis of most of these caves are produced by the marine erosion and they are known as marine abrasion caves. These caves generally have small dimensions (usually no longer than 50 m), display ascending profiles and can produce blowholes, tunnels and arches. Although they have initially nothing to do with karst, several karstic or karst-related processes can act on these caves, and speleothems, karstic fillings, dissolution phenomena, etc., can be observed inside them. Also cave fauna can be found.[cat] A les costes d’erosió de les Illes Balears podem trobar-hi abundants coves litorals; moltes d’aquestes tenen la seva gènesi lligada a l’erosió marina i s’anomenen coves d’abrasió marina. Aquestes cavitats són per norma general de modestes dimensions (no passen normalment dels 50 m de longitud), tenen un perfil ascendent i durant la seva evolució poden donar lloc a bufadors, túnels i arcs. Tot i no tenir res a veure inicialment amb el carst, durant la seva evolució hi poden participar processos càrstics o derivats d’ells; així podem trobar espeleotemes, reompliments càrstics, fenòmens de dissolució, etc. També es pot trobar fauna cavernícola.[spa] En las costas de erosión de las Illes Balears podemos encontrar abundantes cuevas litorales; la mayoría tienen su génesis ligada a la erosión marina y se denominan cuevas de abrasión marina. Estas cavidades son por norma general de modestas dimensiones (no pasan normalmente de 50 m de longitud), tienen un perfil ascendente y pueden dar lugar durante su evolución a agujeros sopladores, túneles y arcos. A pesar de no tener inicialmente nada que ver con el karst, durante su evolución pueden participar procesos kársticos o derivados de ellos; así podemos encontrar espeleotemas, rellenos kársticos, fenómenos de disolución, etc. También es posible encontrar fauna cavernícola