Naslov
Effects of Solvent Polarity and Pressure on High Pressure Extraction of Flavonoids and Antioxidant Capacity from Freeze-Dried Red Grape Skin

Autori
Karlović, Sven ; Ježek, Damir ; Resman, Bernarda ; Šuštić, Ivana ; Bursać Kovačević, Danijela ; Dragović-Uzelac, Verica

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of 2nd I.C. FABE 2015 / Petros, K. ; Leontopoulos, S. - Larissa : Technological Educational Institute of Thessaly, 2015, 72-76

Skup
International Conference of Food and Biosystems Engineering

Mjesto i datum
Mikonos, Grčka, 28.05.2015. - 31.05.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
High hydrostatic pressure; extraction; bioactive compounds; grape

Sažetak
Red grape pomace is an industrial by-product remained after red winemaking process that consist of seeds, skins and stalk fragments. This waste material is an inexpensive and valuable source of phenolic compounds. Consequently, there is a great interest in the exploitation of this type of grape byproducts to obtain potentially bioactive phenolic compounds with high antioxidant potential. Therefore, the aim of this study was to evaluate the use of innovative and more efficient extraction method such as high pressure extraction (HPE) at different conditions combined with extraction solvents of various polarities, in order to enhance the efficiency of the extraction of flavonoids from red grape skin. High hydrostatic pressure as a novel processing technology use pressures of approximately up to 1200 MPa to enhance various unit operations. Influence of pressure on cell walls, matrix, liquid volume, temperature and other parameters can significantly increase mass transport of solutes. This is especially beneficial in the extraction process, as air bubbles inside the cell structure are compressed and gaps were filled with liquid. During decompression air expands and reoccupy previous volume, which leads to membrane damage and increased extraction. Effect of high hydrostatic pressures (up to 500 MPa) and ethanol concentration at room temperature on extraction of anthocyanins and other bioactive compounds was investigated and optimization of process parameters was performed. As a conclusion, HPE has been shown to be an efficient method for extraction of flavonoids from freeze-dried red grape skin and could have potential benefits for the use in different industries.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija, Prehrambena tehnologija

POVEZANOST RADA