PIERO BAGLIONI | Università degli Studi di Firenze (University of Florence) (original) (raw)
Papers by PIERO BAGLIONI
The Journal of …, Jan 1, 2007
Proceedings of the National Academy of Sciences, 2012
Progress in Colloid & Polymer Science, 1996
Photochemically induced viscosity changes in dilute aqueous micellar solutions of cetyltrimethyla... more Photochemically induced viscosity changes in dilute aqueous micellar solutions of cetyltrimethylammonium bromide (CTAB) and of Triton X-100 (TRI) are brought about via the photoconversion of solubilized N-methyldiphenylamine (MDPA) to N-methylcarbazole (MC). Previously, these photorheological effects were ascribed to transformations of the micellar hydration shell. New support for this rationalization was gained from ESR-spectra of various nitroxide radical spin probes measured in the respective systems. Coupling constant variations of probes associated with the micelles indicated that MDPA is solubilized near the micelle/water interface while MC is located deeper in the micellar core. Probes residing in the bulk aqueous phase were not affected by the presence of solubilizates. Only spin probes located in the aqueous phase just outside the micelle, i.e., in the hydration layer, responded to observed macroscopic viscosity changes by accordingly varying motional correlation times. — In lyotropic liquid crystalline systems phase transitions can be induced by photochemically transforming certain solubilizates, when photoeducts induce transition temperatures distinct from those induced by the photoproducts. Series of bis-thienyl-cyclopentenes (BTCPs) (capable of photocyclization) and of hydroxystilbazolium bromides (capable of cis-trans isomerizations and dimerizations) were tested as photochemically reactive solubilizates in CTAB-water (transition nematic-isotropic), AOT-glycerol, and AOT-formamide (transition lamellar-isotropic). Shifts of transition temperatures up to 10°C upon irradiating systems contamining these solubilizates were found.
Progress in Colloid and Polymer Science, 2001
The principal aim of this study was the development of oil-in-water (o/w) microemulsions effectiv... more The principal aim of this study was the development of oil-in-water (o/w) microemulsions effective in the solu-bilization of acrylic copolymers. These copolymeric substances have been widely used in cultural heritage conservation since 1960. They have mainly been applied as ...
Colloids and Surfaces B: Biointerfaces, 2015
POP-Ade (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidyladenosine) is a biocompatible anionic nucl... more POP-Ade (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidyladenosine) is a biocompatible anionic nucleolipid with the DNA nucleoside, Adenosine, in the polar headgroup. We have studied the affinity of nucleic acids of different contour length, composition and structure toward supported lipid bilayers (SLB) composed of POP-Ade mixed with the zwitterionic phospholipid POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) using quartz crystal microbalance with dissipation monitoring (QCM-D) and neutron reflectometry (NR). In order to highlight the specificity of the nucleic acid interaction, the results were compared with data obtained for SLB containing the anionic phospholipid POPG (1-palmitoyl-2-oleoyl-sn-phosphatidyl-glycerol) replacing POP-Ade. Our results demonstrate that the presence of a nucleobase headgroup provides the bilayers with the ability to bind single stranded nucleic acids in a selective fashion, according to a Watson-Crick pattern. In addition the interaction with double stranded nucleic acids was strengthened. Overall, these findings represent fundamental information for the design of biocompatible DNA vectors with DNA-RNA-based amphiphiles.
The aim of the project is to verify a new liquid biofuel chain for heat production (proof of a co... more The aim of the project is to verify a new liquid biofuel chain for heat production (proof of a concept), to determine fuel specifications for pyrolysis oil (PO) in different applications and to carry out long-term combustion tests. Scientific objectives include modification of PO composition for improved stability by hot gas filtration and production of emulsions and cleaner combustion by
The Journal of Physical Chemistry, 1987
ABSTRACT
The Journal of Physical Chemistry, 1991
... Young So0 Kang, Piero Baglioni,+ Hugh JD McManus, and Larry Kevan* ... 1 1985,81, 1025. (7) S... more ... Young So0 Kang, Piero Baglioni,+ Hugh JD McManus, and Larry Kevan* ... 1 1985,81, 1025. (7) Szajdzinska-Pietek, E.; Maldonado, D.; Kevan, L.; Jones, RR M. J. (8) Maldonado, R.; Kevan, L.; Szajdzinska-Pietek, E.; Jones, RR M. J. (9) Baglioni, P.; Kevan, L. J. Phys. Chem. ...
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1988
Electron spin echo modulation (ESEM) and electron spin resonance (ESR) spectra of the photogenera... more Electron spin echo modulation (ESEM) and electron spin resonance (ESR) spectra of the photogenerated N,N,N',N'-tetramethylbenzidine cation radical (TMB/sup +/) in frozen mixed micelles of dodecyltrimethylammonium chloride (DTAC) and sodium dodecyl sulfate (SDS) have been studied as a function of the mixed micelle composition. ESEM effects due to TMB/sup +/ interactions with deuterium in DâO show a decrease of the TMB/sup
The Journal of Physical Chemistry, 1992
ABSTRACT Electron spin resonance (ESR) spectroscopy is used to detect the photoreduction yield of... more ABSTRACT Electron spin resonance (ESR) spectroscopy is used to detect the photoreduction yield of alkylmethylviologens (AV{sup 2+}) in rapidly frozen dioctadecyldimethylammonium chloride (DODAC) vesicles containing concentrations of α-tocopherol (major component of vitamin E) from 0 to 23 mol %. The observed radicals are alkylmethylviologen cation radicals (AV{sup +}) from photoirradiated AV{sup 2+} in DODAC vesicles without α-tocopherol. For 1-3 mol % α-tocopherol, the major radical is AV{sup +} and the minor radical is a neutral free radical of α-tocopherol (EO) which is formed by photoinduced conversion from the α-tocopherol cation radical (EH{sup +}) with DODAC vesicles acting as proton scavengers. The total ESR intensity increases with an increase of the alkyl chain length of AV{sup 2+}. The AV{sup +} intensity increases slightly with increasing α-tocopherol concentration. For over 9 mol % α-tocopherol, the major radical becomes EO, and at 17 mol % EO alone is observed. This is explained by acceleration of the photoreduction of AV{sup 2+} to AV{sup +} by electrons released from α-tocopherol and further photoreduction of AV{sup +} to AV, which is not detected by ESR spectroscopy. The photoyield for 23 mol % α-tocopherol in DODAC vesicles without AV{sup 2+} is about 2-fold more than that in hexane solution. This enhancement of photoyield suggests that DODAC may act as a proton scavenger and compartmentalize α-tocopherol to minimize back electron reaction. 26 refs., 8 figs.
Progress in Colloid and Polymer Science, 2002
ABSTRACT
Studies in Conservation, 2002
ABSTRACT
The Journal of Physical Chemistry, 1989
Electron spin-echo studies have been carried out for a series of x-doxylstearic acid spin probes ... more Electron spin-echo studies have been carried out for a series of x-doxylstearic acid spin probes (x-DSA, x = 5, 7, 10, 12, and 16) in frozen micellar solutions of some poly(ethylene oxide) surfactants, CââEâ, CââEâ, CâEâ, and CâEâ, and in surfactants selectively deuterated along the aliphatic chain or in the poly(ethylene oxide) groups, (CD)ââEâ, CââDâ, CâDâ, and (CD)ââEâ, in DâO
Trends in Colloid and Interface Science XVI, 2004
Progress in Thermochemical Biomass Conversion, 2001
ABSTRACT
Nature nanotechnology, Jan 9, 2015
The Journal of …, Jan 1, 2007
Proceedings of the National Academy of Sciences, 2012
Progress in Colloid & Polymer Science, 1996
Photochemically induced viscosity changes in dilute aqueous micellar solutions of cetyltrimethyla... more Photochemically induced viscosity changes in dilute aqueous micellar solutions of cetyltrimethylammonium bromide (CTAB) and of Triton X-100 (TRI) are brought about via the photoconversion of solubilized N-methyldiphenylamine (MDPA) to N-methylcarbazole (MC). Previously, these photorheological effects were ascribed to transformations of the micellar hydration shell. New support for this rationalization was gained from ESR-spectra of various nitroxide radical spin probes measured in the respective systems. Coupling constant variations of probes associated with the micelles indicated that MDPA is solubilized near the micelle/water interface while MC is located deeper in the micellar core. Probes residing in the bulk aqueous phase were not affected by the presence of solubilizates. Only spin probes located in the aqueous phase just outside the micelle, i.e., in the hydration layer, responded to observed macroscopic viscosity changes by accordingly varying motional correlation times. — In lyotropic liquid crystalline systems phase transitions can be induced by photochemically transforming certain solubilizates, when photoeducts induce transition temperatures distinct from those induced by the photoproducts. Series of bis-thienyl-cyclopentenes (BTCPs) (capable of photocyclization) and of hydroxystilbazolium bromides (capable of cis-trans isomerizations and dimerizations) were tested as photochemically reactive solubilizates in CTAB-water (transition nematic-isotropic), AOT-glycerol, and AOT-formamide (transition lamellar-isotropic). Shifts of transition temperatures up to 10°C upon irradiating systems contamining these solubilizates were found.
Progress in Colloid and Polymer Science, 2001
The principal aim of this study was the development of oil-in-water (o/w) microemulsions effectiv... more The principal aim of this study was the development of oil-in-water (o/w) microemulsions effective in the solu-bilization of acrylic copolymers. These copolymeric substances have been widely used in cultural heritage conservation since 1960. They have mainly been applied as ...
Colloids and Surfaces B: Biointerfaces, 2015
POP-Ade (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidyladenosine) is a biocompatible anionic nucl... more POP-Ade (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidyladenosine) is a biocompatible anionic nucleolipid with the DNA nucleoside, Adenosine, in the polar headgroup. We have studied the affinity of nucleic acids of different contour length, composition and structure toward supported lipid bilayers (SLB) composed of POP-Ade mixed with the zwitterionic phospholipid POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine) using quartz crystal microbalance with dissipation monitoring (QCM-D) and neutron reflectometry (NR). In order to highlight the specificity of the nucleic acid interaction, the results were compared with data obtained for SLB containing the anionic phospholipid POPG (1-palmitoyl-2-oleoyl-sn-phosphatidyl-glycerol) replacing POP-Ade. Our results demonstrate that the presence of a nucleobase headgroup provides the bilayers with the ability to bind single stranded nucleic acids in a selective fashion, according to a Watson-Crick pattern. In addition the interaction with double stranded nucleic acids was strengthened. Overall, these findings represent fundamental information for the design of biocompatible DNA vectors with DNA-RNA-based amphiphiles.
The aim of the project is to verify a new liquid biofuel chain for heat production (proof of a co... more The aim of the project is to verify a new liquid biofuel chain for heat production (proof of a concept), to determine fuel specifications for pyrolysis oil (PO) in different applications and to carry out long-term combustion tests. Scientific objectives include modification of PO composition for improved stability by hot gas filtration and production of emulsions and cleaner combustion by
The Journal of Physical Chemistry, 1987
ABSTRACT
The Journal of Physical Chemistry, 1991
... Young So0 Kang, Piero Baglioni,+ Hugh JD McManus, and Larry Kevan* ... 1 1985,81, 1025. (7) S... more ... Young So0 Kang, Piero Baglioni,+ Hugh JD McManus, and Larry Kevan* ... 1 1985,81, 1025. (7) Szajdzinska-Pietek, E.; Maldonado, D.; Kevan, L.; Jones, RR M. J. (8) Maldonado, R.; Kevan, L.; Szajdzinska-Pietek, E.; Jones, RR M. J. (9) Baglioni, P.; Kevan, L. J. Phys. Chem. ...
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1991
ABSTRACT
The Journal of Physical Chemistry, 1988
Electron spin echo modulation (ESEM) and electron spin resonance (ESR) spectra of the photogenera... more Electron spin echo modulation (ESEM) and electron spin resonance (ESR) spectra of the photogenerated N,N,N',N'-tetramethylbenzidine cation radical (TMB/sup +/) in frozen mixed micelles of dodecyltrimethylammonium chloride (DTAC) and sodium dodecyl sulfate (SDS) have been studied as a function of the mixed micelle composition. ESEM effects due to TMB/sup +/ interactions with deuterium in DâO show a decrease of the TMB/sup
The Journal of Physical Chemistry, 1992
ABSTRACT Electron spin resonance (ESR) spectroscopy is used to detect the photoreduction yield of... more ABSTRACT Electron spin resonance (ESR) spectroscopy is used to detect the photoreduction yield of alkylmethylviologens (AV{sup 2+}) in rapidly frozen dioctadecyldimethylammonium chloride (DODAC) vesicles containing concentrations of α-tocopherol (major component of vitamin E) from 0 to 23 mol %. The observed radicals are alkylmethylviologen cation radicals (AV{sup +}) from photoirradiated AV{sup 2+} in DODAC vesicles without α-tocopherol. For 1-3 mol % α-tocopherol, the major radical is AV{sup +} and the minor radical is a neutral free radical of α-tocopherol (EO) which is formed by photoinduced conversion from the α-tocopherol cation radical (EH{sup +}) with DODAC vesicles acting as proton scavengers. The total ESR intensity increases with an increase of the alkyl chain length of AV{sup 2+}. The AV{sup +} intensity increases slightly with increasing α-tocopherol concentration. For over 9 mol % α-tocopherol, the major radical becomes EO, and at 17 mol % EO alone is observed. This is explained by acceleration of the photoreduction of AV{sup 2+} to AV{sup +} by electrons released from α-tocopherol and further photoreduction of AV{sup +} to AV, which is not detected by ESR spectroscopy. The photoyield for 23 mol % α-tocopherol in DODAC vesicles without AV{sup 2+} is about 2-fold more than that in hexane solution. This enhancement of photoyield suggests that DODAC may act as a proton scavenger and compartmentalize α-tocopherol to minimize back electron reaction. 26 refs., 8 figs.
Progress in Colloid and Polymer Science, 2002
ABSTRACT
Studies in Conservation, 2002
ABSTRACT
The Journal of Physical Chemistry, 1989
Electron spin-echo studies have been carried out for a series of x-doxylstearic acid spin probes ... more Electron spin-echo studies have been carried out for a series of x-doxylstearic acid spin probes (x-DSA, x = 5, 7, 10, 12, and 16) in frozen micellar solutions of some poly(ethylene oxide) surfactants, CââEâ, CââEâ, CâEâ, and CâEâ, and in surfactants selectively deuterated along the aliphatic chain or in the poly(ethylene oxide) groups, (CD)ââEâ, CââDâ, CâDâ, and (CD)ââEâ, in DâO
Trends in Colloid and Interface Science XVI, 2004
Progress in Thermochemical Biomass Conversion, 2001
ABSTRACT
Nature nanotechnology, Jan 9, 2015