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Semi-Quantitative Characterization of Volatile Organic Compounds in Indoor and Outdoor Air Using Passive Samplers: A Case Study of Milan, Italy
(MDPI AG, 2025-09-16)
Mula, Vllaznim
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Zeneli, Lulzim
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Mehmeti, Valbonë
This study presents a semi-quantitative characterization of volatile organic compound (VOC) concentrations and their emission sources in indoor and outdoor environments across four residential and laboratory sites in Milan, Italy, during the summer of 2024. Radiello® passive samplers (Fondazione Salvatore Maugeri in Padova, Italy) were employed for VOC collection, followed by gas chromatography–mass spectrometry analysis. The semi-quantitative mean total VOC (TVOC) concentration was 220.8 ± 195.4 µg/m3 for the outdoor air and slightly higher at 243.6 ± 134.3 µg/m3 for the indoor air, resulting in an indoor-to-outdoor relative ratio of 1.10. The outdoor VOC profile was dominated by hydrocarbons, accounting for 80.3% ± 4.6% (173.2 ± 143.8 µg/m3) of TVOCs, followed by aromatic hydrocarbons at 13.3% ± 5.5% (37.2 ± 49.7 µg/m3). Indoors, hydrocarbons also predominated, representing 34.1% ± 15.2% (95.2 ± 80.1 µg/m3) of the TVOCs, followed by terpenes at 20.7% ± 15.5% (49.0 ± 46.4 µg/m3). Other VOC groups contributed smaller fractions in both environments. The emission profiles from cleaning and personal care products were assessed semi-quantitatively to determine their relative percentage contributions to the indoor VOCs. Source attribution was further supported by diagnostic relative ratios—benzene/toluene, toluene/benzene, and (m + p)-xylene/ethylbenzene—which provided insight into dominant emission sources and photochemical aging.
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Vasorelaxant Effects of Ethanolic Extract from <i>Cydonia oblonga</i> Mill<i>.</i> Leaves on Isolated Rat Thoracic Aorta and Potential Mechanism of Action
(SAGE Publications, 2024-09)
Krasniqi, Donjeta
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Uka, Albina
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Rexhbeqaj, Era
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Beretta, Giangiacomo
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Petreska Stanoeva, Jasmina
<jats:p> Objective: Cydonia oblonga Mill . leaves ethanolic extract (CydOL-EE) has shown different cardioprotective effects. However, no previous studies investigated its direct effect on the vascular smooth muscle tone. Therefore, the study aimed to test the potential vasodilator activity of CydOL-EE in ex-vivo rat thoracic aorta preparations with an additional investigation of its mechanistic effects. Methods: CydOL-EE phytochemical profile was first investigated by HPLC-DAD-ESI-MS/MS and then tested for the vasorelaxation/vasoreactivity effects in rat aortic rings. The NO synthase inhibitor N(ω)-nitro-L-arginine methyl ester (L-NAME) and cyclic guanosine monophosphate inhibitor 1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) were used to explore of the involvement of NO-dependent pathways. Results: Chromatographic analysis of CydOL-EE revealed the presence of six flavonols and seven hydroxycinnamic acids. Moreover, CydOL-EE showed a decrease in vasoreactivity caused by dose-dependent phenylephrine (PE) (Control, Emax = 104.29 ± 3.67 vs CydOL-EE, Emax = 70.73 ± 3.67, P < .0001) and a direct relaxing activity to precontraction with PE (Emax = 79.63 ± 3.67%). These responses were abolished during e-NOS inhibition, demonstrating that the mechanism of action was predominately controlled by the participation of an endothelium-dependent system. Conclusion: The results of our study show that CydO-EE demonstrates vasorelaxation and reduction of vasoreactivity through a NO-dependent pathway. These findings provide scientific evidence for further understanding of CydOL-EE use in the treatment of cardiovascular disease. </jats:p>

Institute of Chemistry

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