117,483 research outputs found
Effetti dell' inerbimento artificiale del suolo sulla fisiologia di giovani viti (Vitis vinifera L. CV Sangiovese) in Italia meridionale
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Mushroom tyrosinase inhibition by essential oils from lavender and mint
No full textThe screening and characterization of novel tyrosinase inhibitors are useful for potential applications in food technology
and in cosmetic and medical treatment of human pigmentation disorders. In this study the essential oils obtained by
hydrodistillation from the lavender Lavendula spica L. and the mint Mentha x piperita L. were investigated for their
potential tyrosinase inhibitory activity. To gain insights into the potential active compounds of the oil mixtures, the
essential oils composition was assessed by GC-mass-spectrometry techniques. Both extracts significantly inhibited the
mushroom tyrosinase activity (i.e. oxidation of L-DOPA). Inhibition was oil dose-dependent and oil extracts
concentrations inhibiting 50% tyrosinase activity (IC50) were determined. The inhibition kinetics analysed by
Lineweaver-Burk plots, showed a non-competitive and mixed type inhibition for lavender and mint oils, respectively.
Ki values were determined. Our results indicate that lavender and mint essential oils have high potentials in applications
as skin-whitening agents of natural source. Therefore, they may be promising herbal ingredients for the development of
depigmenting agents in clinical, beauty and industrial prospects
Essential oil characterization of Prunus spinosa L., Salvia officinalis L., Eucalyptus globulus L., Melissa officinalis L. and Mentha x piperita L. by a volatolomic approach
No full textIn this study a volatolomic approach is proposed for the characterization of the volatile organic compound (VOC) composition of essential oils (EOs) extracted from common aromatic plants. Five species (Prunus spinosa L., Salvia officinalis L., Eucalyptus globulus L., Melissa officinalis L. and Mentha x piperita L.), particularly widespread in Southern Italy, were selected as recognized sources of natural bioactive compounds with beneficial properties. Hydro distillation and solid-liquid extraction with ethanol at different percentages were used to obtain EOs, and their extraction capabilities were compared analyzing chromatographic profiles obtained by headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography - mass spectrometry (GC-MS). The analytical procedure was optimized in term of SPME fiber, adsorption time and desorption time. GC-MS analyses were performed allowing the profiling of the VOC fingerprint in each plant extract. Experimental data were processed by a statistical multivariate approach (Analysis of Variance and Principal Component Analysis obtained for compounds and chemical classes), confirming that EO aroma profiles were statistically different for each of the selected five plants. The proposed volatolomic approach has proved to be an easy and efficient tool to study the aroma profile, allowing the collection of specific information and opening new perspectives and opportunities for the detection and identification of VOCs in agricultural and ecological applications
Gestione della flora infestante con l'utilizzo dell'olio essenziale di menta
No full textL’accresciuta consapevolezza della necessità di attivaresistemi produttivi in agricoltura più rispettosidell’ambiente stimola l’interesse a rivolgersi alla ricercaper studiare sostanze di origine naturale per ladifesa delle colture.Negli oli essenziali sono contenute molte sostanze allelopatiche.In particolare l’olio essenziale di menta(Menta x piperita L.) risulta essere fitotossico neiconfronti di alcune colture.Per questi motivi si è voluto impostare una prova sperimentalein provincia di Foggia per valutare le proprietàallelopatiche dell’olio essenziale di menta neiconfronti delle malerbe. I risultati hanno confermatoil potere bioerbicida dell’olio in oggetto. Amaranthusretroflexus L., Portulaca oleracea L., Convolvulusarvensis L., Eruca sativa L., Matricaria chamomillaL., Papaver roeas L. sono le specie che hanno subitodi più l’effetto allelopatico dell’estratto di menta
Effetto delle lavorazioni notturne del suolo per il contenimento della flora infestante nella coltivazione di Diplotaxis Tenuifolia (L.) DC
No full textComparative Evaluation of Yield and Fruit Physico-Chemical Characteristics of Five Commercial Cultivars of Pomegranate Grown in Southeastern Italy in Two Consecutive Years
No full textThis study, conducted over two consecutive seasons (2018–2019), evaluates the yield and fruit physico-chemical traits of five commercial cultivars (‘Mollar’, ‘Dente di Cavallo’, ‘Acco’, ‘Jolly red’ and ‘Wonderful’) grown in the orchard at Foggia (Puglia region, southeastern Italy). The results show significant variations among the investigated cultivars for many measured parameters; seasons also significantly affected some data. As an average of the years, both ‘Dente di Cavallo’ and ‘Wonderful’ significantly showed the highest numbers (16.8 and 15.2, respectively) and weights (9.3 Kg, respectively) of fruit per tree. ‘Jolly red’ had the highest percentage of edible portions (58.5%), the most intense red color in juice (a* value, 11.7), a light-red skin color (despite its name) (a* value, 31.1) and the smallest fruits (26.7% of diameter ≤ 80 mm). Total soluble solids of all cultivars were considerable above the minimum value (12 °Brix) required for commercial use. ‘Wonderful’ significantly presented the highest value of juice acidity (2.5 g citric acid 100 mL−1) and the lowest MI value, and therefore it was classified as sour. Both ‘Dente di Cavallo’ and ‘Wonderful’ had significantly higher phenolic contents (591.0 and 519.1 mg 100 mL−1, respectively) than the other cultivars, while ‘Dente di Cavallo’ significantly showed the highest antioxidant activity value (6.4 mmol TE 100 L−1). The Stepwise Discriminant Analysis procedure allowed a significant differentiation among the cultivars. Correlation analysis showed a considerable relation among the different fruit traits. The present data are helpful in the selection of elite desirable pomegranate cultivars to be used for commercial production
Effetti allelopatici di Lavandula officinalis L. e Santureja montana L. su Matricaria chamomilla L.
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