1,721,289 research outputs found
Gustavo Tra VERSARI (a cura di), Laodicea di Frigia.
No full textConstancio Patrick. Gustavo Tra VERSARI (a cura di), Laodicea di Frigia.. In: L'antiquité classique, Tome 71, 2002. pp. 489-490
A simple high-performance liquid chromatography method for the analysis of glucose, glycerol, and methanol in a bioprocess
No full textA reliable high-performance liquid chromatography-refractive index detection method for the simultaneous analysis of glucose, methanol, and glycerol in a bioprocess fermentation media using direct injection is presented. The validation studies show a satisfactory selectivity, linearity, accuracy, and recovery of the method. The lowest concentration detectable for glucose and methanol is 3.5 and 6.7 mg/100 mL, respectively. This method could be an attractive choice for the analysis of these compounds not only in fermentation media but also in biomedical and environmental samples
Enology meets brewing: IGA craft beer as a new product to link innovation and consumer preference
No full textAnthocyanin composition of montepulciano d'abruzzo must during industrial fermentation process
No full textDuring the industrial fermentation of Montepulciano d'Abruzzo red wine–must the changes in amount and composition of 15 anthocyanins present were monitored by HPLC using a spectral array detection. The simultaneous recording of multi–wavelengths allowed the identification of 15 anthocyanins, which presented a characteristic pattern. Among the glycosilated anthocyanins (67–72%) malvidin–3–glucoside was predominant (47–51% of the total). A considerably high level of acylated anthocyanins (30% ± 6.19) was found. During the fermentation the total content of pigment increased up to 293 mg/L after 21 days, before a substantial loss of anthocyanins occurred. Individual anthocyanins showed a similar trend during the timecourse of maceration, being the final degradation step unrelated to the acylation pattern of anthocyanins. © 1999, Taylor & Francis Group, LLC
Leuconostoc oenos and malolactic fermentation in wine: A review
No full textThis review article summarizes the state of the art on Leuconostoc oenos, the bacteria responsible for malolactic fermentation in wine. Both basic and practical aspects related to the metabolism of this microorganism and malolactic fermentation in general are critically reviewed. The former examines the role of genetics for the identification and classification of L. oenos and energetic mechanisms on solute transport (malic and lactic acid). The latter includes practical information on biomass production, optimal growth conditions and stress factors, which are important in growth optimization of malolactic starter cultures. Extensive data and references on the effect of malolactic fermentation on wine composition and sensory analysis are also included
A preliminary comparison between nanofiltration and reverse osmosis membranes for grape juice treatment
No full textAnalysis of selected phenolic compounds by MECC and HPLC. A comparative study
No full textTwo methods of analysis, micellar electrokinetic capillary chromatography (MECC) and reversed-phase high-performance liquid chromatography (RP-HPLC), were developed for the separation and determination of selected phenolic compounds (caffeic acid, catechin, catechol, chlorogenic acid, 3,4-dihydroxyphenylacetic acid, hydroquinone, 4-methylcatechol and vanillin) of nutritional and pharmacological interest. Analytes were detected with UV absorption at λmax 280 and 320 nm. Although catechin and 3-4,dyhidroxyphenylacetic acid showed peak distortion when analyzed by MECC, this technique showed a faster separation ability when compared to RP-HPLC. Moreover, MECC proved to be a powerful tool for the repeatable and reliable quantification of phenolic compounds providing better linearity and area calculation, while RP-HPLC provided the better results in terms of elution time repeatability. Finally, concentration sensitivity in MECC (101-432 μM) were 103 times higher than that of RP-HPLC (90-532 nM). However, both methods had similar minimum detectable mass sensitivity (range: 0.31-2.15 ng) for the selected phenolic compounds
A preliminary comparison between nanofiltration and reverse osmosis membranes for grape juice treatment
No full textNanofiltration (NF) and reverse osmosis (RO) systems were compared using grape juice as feed solution. The initial permeate flux (J) was 7.4, 8.1, and 1.7dm3 m-2 h-1 with NF membranes DS and DK, and RO membrane SWC, respectively. The exponential decay of J in the above NF and RO membranes was characterized by a fouling index equal to 0.16, 0.22, and 0.24, respectively. The permeability of NF membrane DS doubled by increasing the working pressure from 32 to 45 bar. Despite the additional power (+30%) required to work at the higher pressure value there was an energy saving per unit permeate of approximately 35%. The working pressure and temperature affected the selectivity of NF membranes. As expected, a direct relationship between membrane permeability and working temperature occurred; the permeate flux of NF membrane DS increased by about 3% per degree of temperature rise. © 2001 Elsevier Science Ltd. All rights reserved
Role of imaging studies in the diagnosis and follow-up of large-vessel vasculitis: an update
No full textImaging studies play a central role in diagnosing and monitoring giant-cell and Takayasu arteritis. Deep, large vessels can be examined by CT or MRI, while colour Doppler ultrasound and MRI have been used with promising results to investigate the temporal arteries. Positron emission tomography is very sensitive in detecting large-vessel inflammation, although it does not delineate the vessel wall. Imaging procedures can also be used to monitor the disease course. However, imaging signs of inflammation may sometimes persist despite clinical remission and, conversely, seemingly unaffected vessels may develop alterations later on
Adulteration of fruit juices: dihydrochalcones as quality markers for apple juices identification
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