21 research outputs found
EFFECT OF LATE WINTER PRUNING ON SANGIOVESE GRAPE BERRY COMPOSITION FROM ORGANIC MANAGEMENT
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Fast Analysis of Total Polyphenol Content and Antioxidant Activity in Wines and Oenological Tannins Using a Flow Injection System with Tandem Diode Array and Electrochemical Detections
No full textAn analytical method for simultaneous determination of total polyphenol content (TPC) and antioxidant activity (AA) of wines (white and red wines) and oenological tannins, using a flow injection system with sequential diode array and electrochemical amperometry detectors (DAD-ECD), was proposed. The signal at 280 nm provided aggregate data for TPC. The anodic peak related to wine phenolic oxidation was scanned using pulsed integrated amperometry over the potential of 800 mV vs. Ag/AgCl, to obtain AA. Serial dilutions avoided the poisoning at the glassy carbon (GC) electrode and the linear response obtained with both detectors was compared with spectrophotometric assays commonly used in oenology laboratory. Intraday and interday analytical repetitions showed a good repeatability and reproducibility (relative standard deviation RSD < 6% for both detectors), and the satisfactory relationship between the proposed coupled flow injection/DAD-ECD and the classic UV methods (R2TPC = 0.9967; R2DPPH = 0.9621) confirmed the efficacy of flow injection analysis with a coupled detection system, for the reliable quality control of wine and wine-related products
Cyclic voltammetry for authentication and compositional profiling of oenological tannins
No full textClimate change trends, grape production, and potential alcohol concentration in wine from the "Romagna Sangiovese" appellation area (Italy)
No full textThe trend of climate change and its effect on grape production and wine composition was evaluated using a real case study of seven wineries located in the “Romagna Sangiovese” appellation area (northern Italy), one of the most important wine producing region of Italy. This preliminary study focused on three key aspects: (i) Assessment of climate change trends by calculating bioclimatic indices over the last 61 years (from 1953 to 2013) in the Romagna Sangiovese area: significant increasing trends were found for the maximum, mean, and minimum daily temperatures, while a decreasing trend was found for precipitation during the growing season period (April–October). Mean growing season temperature was 18.49 °C, considered as warm days in the Romagna Sangiovese area and optimal for vegetative growth of Sangiovese, while nights during the ripening months were cold (13.66 °C). The rise of temperature shifted studied area from the temperate/warm temperate to the warm temperate-/warm grape-growing region (according to the Huglin classification). (ii) Relation between the potential alcohol content from seven wineries and the climate change from 2001 to 2012: dry spell index (DSI) and Huglin index (HI) suggested a large contribution to increasing level of potential alcohol in Sangiovese wines, whereas DSI showed higher correlation with potential alcohol respect to the HI. (iii) Relation between grape production and the climate change from 1982 to 2012: a significant increasing trend was found with little effect of the climate change trends estimated with used bioclimatic indices. Practical implication at viticultural and oenological levels is discussed
Climate change vs Wine industry in the Emilia-Romagna: Assessment of the climate change, influence on wine industry and mitigation techniques
No full textThe first part of the PhD thesis was focused on the assessment of the climate change in the Emilia-Romagna, whereas considered research periods were during the both, past (1961–2015 for the entire Emilia-Romagna; 1953–2013 for the ‘Romagna Sangiovese’ appellation area) and future decades (2018–2027, 2011–2040 and 2071–2100 for the entire Emilia-Romagna). Two types of the spatially interpolated meteorological data for past periods (high resolution and low resolution), spatially interpolated climate data with corrected bias from Regional Climate Models for future periods, diverse statistical methods (Mann-Kendall test, Pettitt test etc.) and appropriate bioclimatic indices developed particularly for the climatic classification of viticulture region were used to identify climatic suitability to cultivate grapes in the Emilia-Romagna. Additionally, a real case study was performed with data from seven Romagna’s wineries in order to identify the potential impact of the climate change on the Sangiovese berry sugar content and grape yield.
The second part of the PhD thesis was focused on the development of mitigation techniques that may be used to face the impact of climate change in the future decades. In particular, late winter pruning was applied to cv. Sangiovese grapes aiming to reduce concentration of total soluble solids in berries. Additionally, dealcholization and acidification of Chardonnay wines were achieved by addition of must from unripe Chardonnay grapes and utilization of non-Saccharomyces yeast strains. Obtained results in the present PhD thesis may help viticulturists and winemakers to further develop wine industry by choosing climatologically appropriate grape varieties or researchers to further develop mitigation techniques which will allow sustainable grape production in the Emilia-Romagna.
The third part was related to the development of an analytical method to evaluate wine parameters affected by climate change and mitigation strategies, same as to analytical profiling of potential additives to face climate change
Real-time video processing framework for functional testing of the DTV/STB devices based on heterogeneous multi-core platform
No full textUtilization of sage by-products as raw material for antioxidantsrecovery—Ultrasound versus microwave-assisted extraction
No full textIn this work, sage (Salvia officinalis L.) by-products from filter tea factory, i.e. sage herbal dust, was valorized as raw material for extraction of phenolic antioxidants. Ultrasound-assisted (UAE) and microwave-assisted extraction (MAE) of polyphenols from sage herbal dust were separately optimized by simultaneous maximization of total phenols (TP) and total flavonoids (TF) yields. Box-Behnken experimental design and response surface methodology (RSM) was used for extraction optimization. In case ofUAE, temperature (40, 60 and 80◦C), extraction time (40, 60 and 80 min) and ultrasonic power (24, 42 and60 W/L) were independent variables, while optimized MAE parameters were ethanol concentration (40,60 and 80%), extraction time (10, 20 and 30 min) and liquid to solid ratio (20, 30 and 40 mL/g). Antioxidant activity of sage extracts was determined by DPPH•, FRAP and superoxide anion radical neutralization assays, and good correlation between polyphenols content and antioxidant activity was observed. According to results, it could be concluded that novel extraction techniques (UAE and MAE) provided significant advantages for recovery of sage polyphenols comparing to traditional methods
