| Autor: |
Ivana Tomaz, Petra Štambuk, Marina Anić, Iva Šikuten, Nera Huzanić, Marko Karoglan, Edi Maletić, Jasminka Karoglan Kontić, Darko Preiner |
| Jazyk: |
Bulgarian<br />Czech<br />English<br />Croatian<br />Hungarian<br />Polish<br />Slovak |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Journal of Central European Agriculture, Vol 22, Iss 2, Pp 429-442 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1332-9049 |
| DOI: |
10.5513/JCEA01/22.2.3135 |
| Popis: |
The aim of this work was to determine the effect of different drying treatments: freeze-drying, room-drying, and oven-drying on the grape phenolic composition of the 'Regent' and 'Cabernet Sauvignon' varieties. After drying, the samples were grounded, submerged to ultrasound-assisted extraction, and analyzed with high-performance liquid chromatography (HPLC). This study demonstrated that the use of different drying methods significantly affects the content of polyphenols in grape skins extracts. The greatest content of anthocyanins-diglucoside was preserved using freeze-drying, i.e. 15706.86 mg/kg for 'Regent', while the content of anthocyanins-monoglucoside was best preserved by room-drying, i.e. 216778.68 and 9220.30 mg/kg for 'Regent' and 'Cabernet Sauvignon', respectively. The highest content of flavonol glycosides (2583.04 and 1429.64 mg/kg for 'Regent' and 'Cabernet Sauvignon', respectively), hydroxycinnamic acids (1303.31 and 544.88 mg/kg for 'Regent' and 'Cabernet Sauvignon', respectively), and stilbene (2321.52 and 79.36 mg/kg for 'Regent' and 'Cabernet Sauvignon', respectively) was observed in the oven-dried samples. By applying freeze-drying the most optimal content of flavan-3-ol was preserved. Contents of polyphenolic compounds in oven-dried samples after 6 months of storage were almost identical to those in the samples analyzed immediately after drying. The greatest rate of degradation was observed in the room-dried samples while it was moderate in the freeze-dried ones. The results of this experiment demonstrate that it is necessary to dry samples in different ways to obtain the highest content of a certain polyphenolic group of compounds. The application of a drying method is determined by the goal of the final dried product in terms of content and composition of different polyphenolic compounds; thus, the obtained results could have an application in scientific research and for commercial purposes as well. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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