master's thesis
Modelling and optimization of solid – liquid extraction process of total polyphenols from conventionally grown soybeans

Anita Ćosić (2009)
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Process Engineering
Sub-department of Modelling, Optimisation and Automatisation
Metadata
TitleModeliranje i optimiranje procesa kruto-tekuće ekstrakcije ukupnih polifenola iz konvencionalno uzgojenog zrna soje
AuthorAnita Ćosić
Mentor(s)Darko Velić (thesis advisor)
Abstract
U radu je ispitivan utjecaj otapala, temperature, te vremena ekstrakcije na ekstraktibilnost ukupnih polifenola iz usitnjenog zrna soje sorte „Ika“. Istraživanje je provedeno u svrhu odabira pogodnog otapala (voda; te 50, 60, 70 i 80%-tna vodena otopina etanola) kojim bi se postigao najveći prinos ukupnih polifenola iz usitnjenog zrna soje pri temperaturi 50 °C nakon 60 minuta. Najučinkovitije otapalo (50%-tna vodena otopina etanola) dalje je korišteno za praćenje kinetike i modeliranje kruto-tekuće ekstrakcije ukupnih polifenola iz usitnjenog zrna soje, srednjeg promjera čestica 0,4586 mm, uz omjer kruto-tekuće 20 mL/g. Koncentracija ekstrahiranih ukupnih polifenola praćena je pri različitim temperaturama (26 °C, 40 °C, 50 °C, 60 °C, 70 °C i 80 °C) tijekom 120 minuta. Koncentracija ukupnih polifenola u ekstraktu određena je spektrofotometrijskom Folin-Ciocalteu-ovom mikro metodom. Ispitana je i mogućnost primjene različitih matematičkih modela (Pelegov, Pageov i Logaritamski model) za opisivanje kinetike kruto-tekuće ekstrakcije ukupnih polifenola iz usitnjenog zrna soje sorte „Ika“ Utvrđeno je da ispitivana otapala i temperatura ekstrakcije imaju značajan utjecaj na kinetiku i prinos ekstrakcije ukupnih polifenola iz usitnjenog zrna soje sorte „Ika“. Dobiveni rezultati pokazali su da je najveća učinkovitost ekstrakcije postignuta primjenom 50%-tne vodene otopine etanola pri temperaturi od 80 °C nakon 120 minuta (4,322 mg GAE/gs.tv.), te da je prinos ukupnih polifenola u ekstraktima zrna soje rastao s povećanjem temperature i produljenjem trajanja procesa ekstrakcije. Ispitani matematički modeli pokazali su dobra slaganja s eksperimentalo dobivenim rezultatima, što omogućuje njihovu primjenu u modeliranju i optimiranju procesa krutotekuće ekstrakcije ukupnih polifenola iz zrna soje.
Keywordsextraction liquid extraction soybeans total polyphenols modeling optimization
Parallel title (English)Modelling and optimization of solid – liquid extraction process of total polyphenols from conventionally grown soybeans
Committee MembersMate Bilić
Darko Velić
Ana Bucić-Kojić
Mirela Planinić
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Lower level organizational unitsDepartment of Process Engineering
Sub-department of Modelling, Optimisation and Automatisation
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Food Technology
Engineering
Study programme typeuniversity
Study levelgraduate
Study programmeFood Technology and Process Engineering
Academic title abbreviationdipl. ing.
Genremaster's thesis
Language Croatian
Defense date2009-07-22
Parallel abstract (English)
In this study the influence of solvent, temperature and the extraction time on the extractability of total polyphenols from milled soybeans variety “Ika” were investigated. The study was performed in order to select the suitable solvent (water; as well as 50, 60, 70 and 80% of aqueous ethanol solution) for achieving the highest yield of total polyphenols from soybeans at 50 °C after 60 minutes of the extraction process. The most effective solvent (50% aqueous ethanol solution) was used for monitoring the kinetics and modelling of solid – liquid extraction of total polyphenols from soybeans, mean particles size 0.4586 mm at solid – liquid ratio 20 mL/g. The total polyphenol content was investigated at different temperatures (26 °C, 40 °C, 50 °C, 60 °C, 70 °C and 80 °C) during 120 minutes of the extraction process. The total polyphenols content in soybean extract was determined spectrophotometrically using Folin-Ciocalteu micro-methods. The possibility of applying different mathematical models (Peleg, Page and Logarithmic model) to describe the kinetic of solid-liquid extraction process of total polyphenols from milled soybeans variety "Ika" was studied as well. The results exhibited the significant influence of solvent and temperature on the kinetics and extraction yield of total polyphenols from soybeans variety "Ika". The best extraction yield of total polyphenols was obtained using 50% aqueous ethanol solution at 80 °C after 120 minutes (4.322 mg GAE/gdb). The extraction yield of total polyphenols in soybean extracts was increased with increasing extraction temperature and extended duration of the extraction process. The applied mathematical models showed good agreement with experimental results, which allows their application in modelling and optimization of solid-liquid extraction process of total polyphenols from soybeans.
Parallel keywords (Croatian)ekstrakcija ekstrakcija kruto-tekuće soja ukupni polifenoli modeliranje optimiranje
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:109:319896
CommitterSanda Hasenay