diplomski projekt
Blaž Vivod (Author), Marko Petrič (Reviewer), Ida Poljanšek (Mentor), Primož Oven (Co-mentor)

Abstract

Analizirali smo variabilnost vsebnosti ekstraktivov in delež celokupnih fenolov v posameznih tkivih drevesa navadne robinije (Robinia pseudoacacia L.). Na območju Obreža (Središče ob Dravi, Slovenija) smo posekali drevesa robinije in iz njih izžagali vzorce. Iz vzorcev smo v laboratoriju izžagali posamezna tkiva, jih zmleli in pripravili za ekstrakcijo po Soxhletu. Ekstrakcijo smo najprej opravili z nepolarnim topilom cikloheksanom, da so se izločile lipofilne komponente. Nato smo hidrofilne komponente izločili s polarnim topilom acetonom/vodo. Acetonske vzorce ekstraktivov smo z UV/VIS spektroskopijo uporabili za določanje celokupnih fenolov. Največja povprečna vsebnost celokupnih ekstraktov je bila v jedrovini (8,41 %), najmanjša pa v beljavi (4,88 %). Največja povprečna vsebnost lipofilnih ekstraktivov (30,40 mg/g) je bila v območju skorje, medtem ko so imela ostala analizirana tkiva precej nižje vrednosti. V mrtvih grčah je bila povprečna vsebnost lipofilnih ekstraktivov najnižja (7,36 mg/g). Povprečna vsebnost hidrofilnih ekstraktivov je bila največja v jedrovini (78,26 mg/g), najmanjša je bila v območju beljave (25,20 mg/g). Največja povprečna vsebnost celokupnih fenolov je bila v območju jedrovine (34,89 mg/g), najmanjša pa v beljavi (4,70 mg/g). Periferni deli jedrovine so imeli največji delež celokupnih fenolov, proti centru stržena pa se je njihova vsebnost zmanjševala. Vsebnost celokupnih fenolov je bila pri vseh preučevanih drevesih navadne robinije večja v jedrovini kot v beljavi

Keywords

Robinia pseudoacacia;ekstraktivi;fenoli;spektrofotometrija;grče;jedrovina;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [B. Vivod]
UDC: 630*813
COBISS: 2427273 Link will open in a new window
Views: 397
Downloads: 101
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Contents of extractives in wood of black locust (Robinia pseudoacacia L.)
Secondary abstract: We analysed variability of extractive contents and the share of total phenols in different tissues of black locust trees (Robinia pseudoacacia L.). Black locust trees from Obrež (Središče ob Dravi, Slovenia) area were cut down and wood samples sawn out. Individual tissues werem sawn out, milled and prepared for extraction by Soxhlet. The extraction was conducted with a non-polar solvent cyclohexane for the lipophilic components, and with a polar solvent acetone/water for the hydrophilic components. Acetone extracts were used for the determination of total phenols done by UV/VIS spectroscopy. The highest average concentration of total extracts was found in heartwood (8.41 %), and the lowest in the sapwood (4.88 %). The bark area had the highest average content of lipophilic extractives (30.40 mg/g), while the other studied tissues had much lower values. The lowest average content of lipophilic extractives (7.36 mg/g) was in dead knots. The average content of hydrophilic extractives was the largest in the heartwood (78.26 mg/g) and the lowest in the range of sapwood (25.20 mg/g). The highest average concentration of total phenols was in the range of heartwood (34.89 mg/g), and the lowest in the sapwood (4.70 mg/g). Peripheral parts of heartwood had the largest share of total phenols, however, towards the centre of the core their value decreased. In all the researched robinia trees, the content of total phenols was greater in heartwood than in sapwood
Secondary keywords: Robinia pseudoacacia;extractives;phenols;spectrophotometry;knots;heartwood;
Type (COBISS): Diploma project paper
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: XIII, 56 f., [11] f. pril.
ID: 11908580