Mahatsak txerritzen

Abstract

Laburpena: Lan honetan, optimizatu egin da bi urratseko jariakin gainkritikoaren bidezko erauzketa (SFE Supercritical Fluid Extraction), ardo hondakinetatik konposatu bioaktiboak lortzeko. Ondorioz, lortu da lehen urratsean gantz azidoak soilik eta bigarren urratsean polifenolak soilik erauztea. Polifenolek egonkortasun eskasa dute ordea. Hori dela eta, zurrusta-bibrazio bidezko mikrokapsularatzea (VNM Vibration Nozzle Microencapsulation) erabili da 150 eta 300 µm-ko zurrustekin kaltzio-alginatozko eta kaltzio-alginato-kitosanezko tamaina ezberdinetako polifenolen mikrokapsulak eratzeko. Prozesu horretan eragina duten aldagaiak optimizatu, kapsulak sortu eta haien egonkortasuna aztertu da 6 hilabetetan zehar hainbat kontserbazio-baldintzatan (4°C-ra ilunpean eta giro-tenperaturan ilunpean eta argipean). Ondorioz, ikusi da kapsulatutako polifenolen egonkortasuna baldintza guztietan kapsulatu gabeena baino askoz ere handiagoa dela.Hitz-gakoak: Ardo-hondakinak, Jariakin gainkritikoaren bidezko erauzketa, mikrokapsularatzea, gantz azidoak, polifenolak.Abstract: In this study supercritical fluid extraction (SFE) has been successfully applied to a sequential fractionation of fatty acids and polyphenols from wine wastes. Unfortunately, polyphenols have a poor long-term stability, so they were encapsulated through vibration nozzle microencapsulation using two nozzles of 150 and 300 µm and sodium alginate and sodium-alginate-chitosan as polymer. Long-term stability of the created microcapsules was studied for 6 months taking into account different storage conditions: at 4 °C in darkness, and at room temperature in darkness and in presence of light. Encapsulated polyphenols were found to be much more stable compared to free polyphenols regardless the encapsulation procedure and storage conditions.

Degradation kinetics of encapsulated grape skin phenolics and micronized grape skins in various water activity environments and criteria to develop wide-ranging and tailor-made food applications

“…The decrease in phenolic compounds during storage in various aw environments followed a first-order kinetics, as observed previously (Reyes & Cisneros-Zevallos, 2007;Souza et al, 2014;Aizpurua-Olaizola et al, 2016). A representative behavior is shown for malvidin 3-O-glucoside in Figure 3.…”

“…It is worth noticing that lower half-life for catechin and epicatechin, i.e. 19 and 20 d respectively, at 25 °C, were observed in a grape waste liquid extract (Aizpurua-Olaizola et al, 2016).…”

Atzoko baliabideak, biharko osasuna: ardo-hondakinak eta kannabisa

“…Ardo-hondakinetatik konposatu bioaktiboak erauzteko, jariakin gainkritiko bidezko erauzketa erabili genuen [5][6]. Gas bat egoera gainkritikora pasa daiteke ezarritako presioak eta tenperaturak gas bakoitzaren bereizga- Oier Aizpurua-Olaizola, Patricia Navarro, Nestor Etxebarria, Aresatz Usobiaga rri den puntu kritiko bat gainditzen badute.…”

“…Arazo hori konpontzeko, zurrusta-bibrazio bidezko mikrokapsularatze-teknika bat garatu genuen (3. irudia) [6,8].…”