Search results for "fenoli"
showing 10 items of 73 documents
Oxidovanadium(v) complexes with l-proline-based amino acid phenolates
2019
L-proline was used to prepare chiral, tridentate amino acid phenol proligands H2L1—4. These proligands react with vanadium precursors VO(acac)2, VOSO4 ∙ 5 H2O and VO(OPr)3 in methanol to form the corresponding oxidoalkoxidovanadium(V) complexes 1—4. The complexes crystallize from methanol, and are octahedrally coordinated with a general formula [VO(L1—4)(OMe)(MeOH)]. In solution, however, they adopt several different conformations or isomeric structures depending on the solvent. peerReviewed
Vaccinium uliginosum L. ogu izspiedu ekstrakta antioksidatīvās īpašības
2020
Ogu izspiedas tagad tiek novērtētas kā veselībai nozīmīgu, bioloģiski aktīvu vielu avots. Oksidatīvais šūnu stress ir daudzu patoloģiju pamatā, tāpēc tā novēršanai tiek meklēti savienojumi ar antioksidantu īpašībām. Darba mērķis ir pētīt zileņu izspiedu ekstrakta kopējo polifenolu un flavonoīdu saturu un antioksidantu īpašības. Tika izmantoti vairāki testi – kopējā antioksidantu spēja, brīvā radikāļa DPPH un superoksīda anjona koncentrācijas samazināšana un reducētāja spēja. Visos testos zileņu ekstraktam atradām antioksidantu īpašības. Zileņu ekstrakta antioksidantu efekti tika salīdzināti ar askorbīnskābes un troloksa efektiem. Polifenolu saturs bija 0,14 gallu skābes ekvivalenti uz mg zi…
Field-Grown and In Vitro Propagated Round-Leaved Sundew (Drosera rotundifolia L.) Show Differences in Metabolic Profiles and Biological Activities
2021
Drosera rotundifolia L. is a carnivorous plant used in traditional medicine for its therapeutic properties. Because of its small size, its collection in nature is laborious and different cultivation methods have been studied to ensure availability. However, only a few studies exist where the lab-grown sundew tissue and field-grown sundew would have been compared in their functionality or metabolic profiles. In this study, the antioxidant and antiviral activities of lab-grown and field-grown sundew extracts and their metabolic profiles are examined. The effect of drying methods on the chromatographic profile of the extracts is also shown. Antioxidant activity was significantly higher (5–6 ti…
Salix spp. Bark Hot Water Extracts Show Antiviral, Antibacterial, and Antioxidant Activities—The Bioactive Properties of 16 Clones
2021
Funding Information: This work was supported by Business Finland corona-co-creation funding for the project Antiviral Fibers?pilot with extracts from Finnish forests (grant: 40699/31/2020). This study was also funded by the Natural Resources Institute Finland?s strategic research funding to the projects ?More, faster, higher quality: potential of short-rotation aspen and willow biomass for novel products in bioeconomy? (AspenWill) and ?Added value potential of new and under-utilized fibre sources in Finnish value networks of green bioeconomy: prefeasibility, prototyping, and market acceptance? (VALUEPOT). In addition, Academy of Finland has supported this study via the project ?Antivirals f…
Enzyme-assisted extraction of anthocyanins and other phenolic compounds from blackcurrant (Ribes nigrum L.) press cake: From processing to bioactivit…
2022
The effects of commercial enzymes (pectinases, cellulases, beta-1-3-glucanases, and pectin lyases) on the recovery of anthocyanins and polyphenols from blackcurrant press cake were studied considering two solid:solvent ratios (1:10 and 1:4 w/v). β-glucanase enabled the recovery of the highest total phenolic content – 1142 mg/100 g, and the extraction of anthocyanins was similar using all enzymes (∼400 mg/100 g). The use of cellulases and pectinases enhanced the extraction of antioxidants (DPPH − 1080 mg/100 g; CUPRAC – 3697 mg/100 g). The freeze-dried extracts presented antioxidant potential (CUPRAC, DPPH), which was associated with their biological effects in different systems: antiviral a…
Gaismas ietekme uz bioloģiski aktīvo savienojumu uzkrāšanos dažādās tomātu šķirnēs
2021
Gaismas kvalitatīvais sastāvs ietekmē karotinoīdu un fenolu savienojumu biosintēzē iesaistīto gēnu regulēšanu ar fotoreceptoru starpniecību. Audzējot tomātus zem atšķirīga spektrālā sastāva gaismas avotiem, iespējams, varētu panākt atšķirīgu bioloģiski aktīvo savienojumu uzkrāšanos. Šajā maģistra darbā četru dažādu šķirņu tomātus audzēja zem trīs spektrāli atšķirīgiem gaismas avotiem – LED, indukcijas un augstspiediena nātrija lampām. Likopēna, beta-karotīna un fenolu savienojumu, kā nozīmīgu savienojumu tomātu kvalitātes un uzturvērtības nodrošināšanā, uzkrāšanos, atkarībā no izmantotā gaismas avota, tomātu augļos noteica spektrofotometriski. Iegūtie rezultāti liecina, ka gaismas kvalitatī…
Bisphenol A removal from water by biomass-based carbon : Isotherms, kinetics and thermodynamics studies
2020
Biomass-based carbon was modified and used as an efficient bisphenol A (BPA) sorbent. The simple and environmentally friendly modification method produced sorbent with a capacity of 41.5 mg/g. The raw material was modified with FeCl3 (Fe-CR), treated with hydrochloric acid (H-CR) or modified with CaCl2 (Ca-CR). Batch sorption experiments were performed to evaluate the effects of the initial pH, sorbent dosage, temperature, and contact time on BPA removal. BPA removal with modified carbons was notably higher than that with unmodified carbon. All sorbent materials exhibited very high sorption capacities and compared favourably to materials reported in the literature. Several isotherms were ap…
Ympäristöestrogeeniseoksen yhteisvaikutus 20dpfZF-seeprakalan vitellogeniinigeenin ilmentymiseen
2011
Ihmisten toimesta ympäristöön joutuvien vierasaineiden vaikutukset hormonitoimintaan ovat viime vuosina herättäneet paljon keskustelua. Yksi alan tutkituimmista aihealueista on estrogeenin kaltaisesti vaikuttavien aineiden eli ympäristöestrogeenien aiheuttamat lisääntymis- ja kehityshäiriöt. Estrogeenisiä vaikutuksia voidaan tutkia monella tapaa, alkaen solutason vasteista populaatiokehitykseen. Yksi paljon käytetty molekyylimarkkeri on kalojen vitellogeniinitason mittaus. Vaikka normaalioloissa vain naaraat tuottavat vitellogeniiniä, estrogeenialtistuksen vaikutuksesta myös koiraat ja nuoret yksilöt voivat sitä tuottaa. Tässä opinnäytetyössä tutkittiin kolmen ympäristöestrogeenin, bisfenol…