Ekstrakcija lubja kostanja s subkritično vodo

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Andreja Turk (Author), Mojca Škerget (Mentor), Maja Čolnik (Co-mentor)

Abstract

Biomasa predstavlja naravni vir vrednih komponent. Lubje kostanja vsebuje visoke vsebnosti taninov in različne fenolne spojine, ki se uporabljajo v medicini ter farmacevtski, kozmetični in prehrambeni industriji. Namen diplomskega dela je bil separirati vredne spojine iz lubja kostanja s subkritično vodo in optimizirati proces z uporabo metode odzivnih površin z zasnovo Box-Behnkenovega načrtovanja. Optimizirali smo tri ključne spremenljivke, in sicer temperaturo, čas in razmerje topilo/material, ter spremljali njihov vpliv na ekstrakcijski izkoristek in vsebnost vrednih komponent v lubju, kot so totalni fenoli, totalni tanini in antioksidativna aktivnost. V lubju smo dokazali prisotnost elagne in galne kisline, elagotaninov (veskalagin, kastalagin, 1-o-galoj kastalagin), sladkorjev (maltoza, glukoza, fruktoza in arabinoza) ter njihovih derivatov (5-HMF, furfural in levulinska kislina). Zadnji korak v diplomskem delu je bil določitev optimalnih pogojev, s katerimi bi dosegli najvišjo vsebnost elagne kisline ter zadovoljive vsebnosti totalnih fenolov in totalnih taninov.

Keywords

subkritična voda;navadni kostanj;fenolne spojine;optimizacija procesov;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2018
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[A. Turk]
UDC:	547.98:582.747.2(043.2)
COBISS:	21950486
Views:	1021
Downloads:	106
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Extraction of chestnut bark with subcritical water
Secondary abstract:	Biomass represents the natural source of valuable compounds. Chestnut bark contains high level of tannins and various phenolic compounds which can be utilized in medicine and pharmaceutical, cosmetic, and food industry. The aim of this work was optimization of subcritical water extraction process of chestnut bark using Box-Behnken response surface method. The influence of process parameters, such as temperature, extraction time and solid-solvent ratio, on extraction yield, yield of the main compounds, total phenol content, total tannin content and antioxidant activity was observed. The identified compounds were ellagic and gallic acid, ellagitannins (vescalagin, castalagin, 1-o-galloyl castalagin), sugars (maltose, glucose, fructose and arabinose) and sugar derivatives (5-HMF, furfural and levulinic acid). The final step of the work was determination of the optimal conditions of the process to obtain the bark extract highly rich in ellagic acid and with satisfactory level of total phenols and total tannins.
Secondary keywords:	subcritical water;sweet chestnut;phenolic compounds;tannins;deeep euoptimization of process;Box-Behnken method;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	VIII, 43 str.
ID:	10955183