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Wyświetlanie 1-3 z 3
Tytuł:
Impact of natural antioxidant systems on the oxidation resistance and mechanical properties of polypropylene
Autorzy:
Musajan, Dilhumar
Mamatjan, Maklinur
Beken, Riza
Yimit, Mamatjan
Powiązania:
https://bibliotekanauki.pl/articles/778309.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polypropylene
Natural antioxidants
Thermal oxidative aging
Oxidation induction time
Grape seeds
Opis:
This paper describes the separation of oxidation resistant components from the seeds of pomegranate (PSA), grape (GSE) and sea buckthorn (SSE). The anti-oxidation properties of the resultant extracts, used as the natural anti-oxidants for polypropylene (PP), were compared with Irganox1010. The effects of these natural antioxidants on the antioxidant levels of PP samples were estimated by thermal oxidative aging and micromixed rheology, OIT, XRD, SEM, TEM and mechanical properties tests of samples before and after aging. The results show that adding PSA, GSE and SSE can obviously increase the mechanical properties of PP. In addition, the molding stability of polypropylene raw material is prolonged and improved. Moreover, the mechanical properties of the PP samples after 240 h of thermal oxidative aging indicates that, the best results, closest to the anti-oxidation ability of Irganox1010, can be obtained when the additive amount is 0.5% (wt%) for PSE or 0.7% (wt%) for GSE.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 1; 68-74
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of grape pomace powders and analysis of their nutritive compositions
Autorzy:
Lou, Wenjuan
Li, Bo
Grevtseva, Nataliya
Powiązania:
https://bibliotekanauki.pl/articles/1833735.pdf
Data publikacji:
2021
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
nutritional content
polyphenolic content
grape seeds
grape skin
grape pomace
antioxidative activity
wartości odżywcze
zawartość polifenoli
pestki winogron
skórka winogron
wytłoki z winogron
aktywność antyoksydacyjna
Opis:
Grape pomace (GP) is produced in large amounts worldwide, leading to waste of resources and environmental pollution. Using grapes grown in eastern China, the main nutrients and polyphenols in grape seeds (GS), skin (GSK), and GP powders were determined by conventional chemical composition analysis and HPLC-MS/MS. The antioxidative activity of a GP polyphenol extract was identified using DPPH and hydroxyl radical scavenging assays and reducing power assay. GSK and GP contained less total dietary fiber than GS. The total polyphenolic content of GS was significantly higher than that of GSK and GP. The hydrogen- and electron-donating activities of the GP polyphenol extract were superior to those of vitamin C.
Źródło:
Acta Innovations; 2021, 39; 22--31
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of antioxidants by HPLC-MS in grapevine seeds
Autorzy:
Sochorova, L.
Klejdus, B.
Mojmir, B.
Tunde, J.
Mlcek, J.
Sochor, J.
Ercisli, S.
Kupe, M.
Powiązania:
https://bibliotekanauki.pl/articles/12691392.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
Czech Republic
grapevine
Vitis vinifera
Blaufrankisch cultivar
Cabernet Moravia cultivar
Italian Riesling cultivar
Nativa cultivar
Kofranka cultivar
grape seed
antioxidant
flavonoids
high performance liquid chromatography
Opis:
It is well known, that grapevine seeds are rich in significant antioxidants. However, the issue of dealing with the analysis and comparison of antioxidant components in the seeds of Vitis vinifera L. in individual cultivars has not yet been sufficiently studied. The experiment was performed with extracts of three varieties (Blaufränkish, Italian Riesling and Cabernet Moravia) and three interspecific cultivars (Nativa, Marlen and Kofranka). Contents of nine major flavonoids (apigenin, astragalin, hyperoside, isorhamnetin, kaempferol, myricetin, quercetin, quercitrin and rutin) and two procyanidins (procyanidin A2 and procyanidin B1) were assessed by the HPLC/MS method. The highest contents of antioxidants were found out in interspecific cultivars Marlen and Nativa while the lowest one was assessed in the cultivar Cabernet Moravia. The most represented flavonoid was hyperoside (cultivar Marlen – 15.66 mg∙l–1), least represented was kaempferol (cultivar Cabernet Moravia – 1.81 µg∙l–1).
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 6; 17-28
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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