Bibliographic Details
| Title: |
Effects of Defoliation on Phenolic Concentrations, Antioxidant and Antibacterial Activity of Grape Skin Extracts of the Varieties Blaufränkisch and Merlot (Vitis vinifera L.) |
| Authors: |
Valentina Pavić, Toni Kujundžić, Marina Kopić, Vladimir Jukić, Ulrike Braun, Florian Schwander, Mato Drenjančević |
| Source: |
Molecules, Vol 24, Iss 13, p 2444 (2019) |
| Publisher Information: |
MDPI AG, 2019. |
| Publication Year: |
2019 |
| Collection: |
LCC:Organic chemistry |
| Subject Terms: |
defoliation, Blaufränkisch, Merlot, phenols, antioxidant activity, antibacterial activity, Organic chemistry, QD241-441 |
| More Details: |
Vitis vinifera L. has been highlighted by its many positive effects on human health, including antibacterial, anti-inflammatory and antioxidant activity due to its rich phytochemical content. Removing six basal leaves has great potential to influence the production of phytochemicals. The purpose of this study was to determine the impact of different terms of defoliation on the antioxidant and antibacterial activity of grape skin extracts of the Blaufränkisch and Merlot varieties. The total phenolic concentration, total and individual anthocyanin concentration, antioxidant activity and antibacterial activity on gram-positive and gram-negative human pathogens have been determined. The study was conducted on three treatments (control treatment without defoliation, defoliation immediately after bloom and defoliation before the start of the véraison phase). The results showed statistically significant enhancement of the total phenolic concentration as well as the antioxidant and antibacterial activity in both studied cultivars. Defoliation just after blooming was the preferable defoliation term in the Merlot variety for achieving the highest total anthocyanin concentration, antioxidant activity and significant increase of antibacterial activity against all four investigated bacteria. Defoliation before the start of the véraison phase was the preferable defoliation term for achieving the highest total anthocyanin concentration in the Blaufränkisch variety. In general, treatment of defoliation immediately after bloom was more beneficial compared with the defoliation before the start of the véraison phase. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
1420-3049 |
| Relation: |
https://www.mdpi.com/1420-3049/24/13/2444; https://doaj.org/toc/1420-3049 |
| DOI: |
10.3390/molecules24132444 |
| Access URL: |
https://doaj.org/article/f38842e967dd4472b0fb67151263d5bd |
| Accession Number: |
edsdoj.f38842e967dd4472b0fb67151263d5bd |
| Database: |
Directory of Open Access Journals |
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