Vpliv temperature in čas ekstrakcije na vsebnost antioksidativnih učinkovin iz iglavcev

diplomsko delo

Nuša Kugler (Author), Mojca Škerget (Mentor), Željko Knez (Co-mentor)

Abstract

Lubje iglavcev vsebuje poleg hidrofilnih polifenolov še lipofilne smole in eterična olja ter netopne snovi, kot so celuloza in lignin. Ker smo dežela bogata z iglastimi gozdovi nas je zanimalo, če so ekstrakti naših iglavcev primerljivi s Piknogenolom, za katerega se ve, da je iz obmorskega bora. Piknogenol je sestavljen iz 50 učinkovin, ki delujejo antioksidacijsko. Glavne fenolne spojine v skorji bora so proantocianidini, flavonoidi so prisotni v manjši količini. Piknogenol blagodejno učinkuje na krvožilni sistem, zato ga še posebno priporočajo diabetikom. Blaži tudi težave z vidom, ki nastanejo zaradi retinopatij, in pospeši regeneracijo manjših površinskih poškodb kože. Tako smo ekstrahirali tri različna lubja iglavcev, zaradi poslovne skrivnosti podjetja so označeni kot vzorec A, B in C. V vzorcih smo določevali vsebnost skupnih fenolov, skupnih flavonoidov, proantocianidinov in antioksidacijsko aktivnost. Najvišjo vsebnost skupnih fenolov, skupnih flavonoidov, proantocianidinov in antioksidacijko aktivnost smo določili v vzorcu A in C. Rezultati kažejo, da smo pri vzorcu A in C dobili največji izkoristek ter vsebnost skupnih fenolov in flavonoidov v ekstrakcijah pri 100°C. Najvišjo vsebnost proantocianidinov in antioksidativno aktivnost pa smo določili v ekstraktih dobljenih pri temperaturi 80°C.

Keywords

ekstrakcija;lubje iglavcev;fenolne spojine;flavonoidi;proantocianidini;antioksidativna aktivnost;

Data

Language:	Slovenian
Year of publishing:	2011
Source:	Maribor
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[N. Kugler]
UDC:	66.061-987(043.2)
COBISS:	16039446
Views:	2635
Downloads:	276
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of temperature and extraction time on the concentration of antioxidants from conifers
Secondary abstract:	Conifer bark contains hydrophilic polyphones, lypophilic resins, essential oil and insoluble substances, such as cellulose and lignin. According to the fact that our country is rich with coniferous forests we were interested in comparing extracts from conifers to pycnogenol, which is made from sea boron. Pycnogenol consists of 50 substances, which have an effect of antioxidant activity. Main phenol compounds in boron bark are proantocianidins, flavonoids are present in a smaller amount. Pycnogenol affects beneficently on circulatory system that is why it is especially recommended to diabetics. It also has positive effects in case of sight problems, that are the consequences of retinopathies, and stimulates the regeneration of smaller skin wounds. Three different conifer barks were extracted. The samples were marked as A, B and C. In samples content of total phenols, total flavonoids, proantocianidins and antioxidant activity were determined. The highest concentration of total phenols, total flavonoids, proantocianidins and antioxidant activity were determined samples A and C. The results show that in the samples A and C were extracted the highest content of dry substance, content of common phenols, flavonoids at 100°C. The highest content of proantocianidins and antioxidant activity were determinated for extracts obtained at 80°C.
Secondary keywords:	extraction;bark of conifers;phenolic compounds;flavonoids;proantocianidins;antioxidant activity;
URN:	URN:SI:UM:
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	XII, 65 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;chemical technology;chemical and related industries;kemijska tehnologija;kemijske in sorodne industrije;chemical technology of liquids;processes and equipment for treatment of or with liquids;kemijska tehnologija tekočin;procesi in oprema za obdelovanje tekočin ali za obdelovanje z njimi;
ID:	998482