126
|
Lombardo D, Mallamace F, Micali N, D'Arrigo G. Dynamic critical phenomena in water-butoxyethanol mixtures studied by viscosity and light-scattering measurements. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1994; 49:1430-1438. [PMID: 9961353 DOI: 10.1103/physreve.49.1430] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
127
|
Micali N, Vasi C, Mallamace F, Bansil R, Pajevic S, Sciortino F. Light-scattering studies in cross-linked gels: Evidence of a microphase separation. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 48:4501-4509. [PMID: 9961132 DOI: 10.1103/physreve.48.4501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
128
|
Micali N, Vasi C, Mallamace F, Corti M, Degiorgio V. Raman scattering and water structure in nonionic amphiphile solutions. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 48:3661-3666. [PMID: 9961023 DOI: 10.1103/physreve.48.3661] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
129
|
Panico A, Pignatello R, Mazzone S, Cardile V, Bindoni M, Cordopatri F, Villari A, Micali N, Mazzone G. Lipid vesicles loaded with thymopentin: characterization and in vitro activity on tumoral cells. Int J Pharm 1993. [DOI: 10.1016/0378-5173(93)90036-f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
130
|
Puglisi G, Giammona G, Fresta M, Carlisi B, Micali N, Villari A. Evaluation of polyalkylcyanoacrylate nanoparticles as a potential drug carrier: preparation, morphological characterization and loading capacity. J Microencapsul 1993; 10:353-66. [PMID: 8377093 DOI: 10.3109/02652049309031525] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Some physicochemical behaviours were investigated of polyethyl- (PECA) and polyisobutylcyanoacrylate (PICA), which, in recent years, have been proposed as nanoparticle colloidal systems for drug carrying. We observed the influence of preparation conditions, such as pH value and surfactant concentration, on parameters such as particle size and polymer molecular weight. Lower operating pH values (0-2) resulted in smaller nanoparticles than those prepared at pH 5.5. The polymer molecular weight was also a function of pH: low molecular weight at low pH and vice-versa. The surfactant concentration positively influenced main particle size and polymer molecular weight. These trends were independent of type of monomer; in fact, both ethyl- (ECA) and isobutyl-2-cyanoacrylate (ICA) showed the same behaviour. Loading capacity, as well as release profile, of the two polymers were evaluated using fluorescein as a model drug. Whereas both polymers showed almost the same release profile, there was a difference in the amount of encapsulated probe: higher aliquots for PICA than for PECA. Storage effects on such physicochemical parameters were also tested.
Collapse
|
131
|
Majolino D, Mallamace F, Migliardo P, Aliotta F, Micali N, Vasi C. Spectral evidence of connected structures in liquid water: Effective Raman density of vibrational states. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 47:2669-2675. [PMID: 9960297 DOI: 10.1103/physreve.47.2669] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
132
|
Villari A, Micali N, Fresta M, Puglisi G. Simultaneous spectrophotometric determination in solid phase of aspirin and its impurity salicylic acid in pharmaceutical formulations. J Pharm Sci 1992; 81:895-8. [PMID: 1432636 DOI: 10.1002/jps.2600810911] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We report the simultaneous determination of aspirin and its hydrolysis product, salicylic acid, in solid phase by fluorescence spectrophotometry. Aspirin is often the most labile component in a combination-type analgesic compound. Therefore, its stability is often the initial concern in any formulation-screening program. Preliminary screening of a large number of potential formulations can be arduous, because most current methods of analysis generally consist of several steps: extractions or column separations followed by UV, colorimetric, or gas-liquid chromatographic assays. The method proposed here is quite suited to large numbers of assays because it is not time consuming, it is straightforward, and it is not subject to interference from the substances present in the pharmaceutical formulations. In addition, the method is nondestructive, not dependent on the sampling procedure, and, above all, quite sensitive.
Collapse
|
133
|
Mallamace F, Micali N, Vasi C, D'arrigo G. Large supramolecular structures in water-alcohol mixtures evidenced by elastic light scattering. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf02457392] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
134
|
Mallamace F, Micali N, D'Arrigo G. Dynamical effects of supramolecular aggregates in water-butoxyethanol mixtures studied by viscosity measurements. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:6652-6658. [PMID: 9905793 DOI: 10.1103/physreva.44.6652] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
135
|
D'Arrigo G, Mallamace F, Micali N, Paparelli A, Vasi C. Molecular aggregations in water-2-butoxyethanol mixtures by ultrasonic and Brillouin light-scattering measurements. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 44:2578-2587. [PMID: 9906238 DOI: 10.1103/physreva.44.2578] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
136
|
Mallamace F, Micali N, Vasi C, D'Arrigo G. Viscoelastic properties of dense microemulsions: Hypersound results. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1991; 43:5710-5713. [PMID: 9904889 DOI: 10.1103/physreva.43.5710] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
137
|
Mallamace F, Micali N, Vasi C. Viscoelastic properties of charged colloids, polystyrene, and silica-water suspensions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:7304-7311. [PMID: 9904045 DOI: 10.1103/physreva.42.7304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
138
|
Majolino D, Mallamace F, Venuto S, Micali N. Viscosity measurements in dense microemulsions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:7330-7339. [PMID: 9904047 DOI: 10.1103/physreva.42.7330] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
139
|
Maisano G, Mallamace F, Micali N, Vasi C, Caponetti E, Triolo R. Correlation spectroscopy in molten and supercooled antimony trichloride. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 41:3245-3249. [PMID: 9903480 DOI: 10.1103/physreva.41.3245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
140
|
Majolino D, Mallamace F, Migliardo P, Micali N, Vasi C. Elastic and quasielastic light-scattering studies of the aggregation phenomena in water solutions of polystyrene particles. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:4665-4674. [PMID: 9902711 DOI: 10.1103/physreva.40.4665] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
141
|
Magazú S, Majolino D, Maisano G, Mallamace F, Micali N. Large structural order in dense microemulsions studied by light scattering. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 40:2643-2648. [PMID: 9902450 DOI: 10.1103/physreva.40.2643] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
142
|
Maisano G, Mallamace F, Micali N. Dynamical properties of a potassium oleate microemulsion determined by photon-correlation spectroscopy. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:4103-4108. [PMID: 9901735 DOI: 10.1103/physreva.39.4103] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
143
|
Magazu' S, Maisano G, Mallamace F, Micali N. Growth of fractal aggregates in water solutions of macromolecules by light scattering. PHYSICAL REVIEW. A, GENERAL PHYSICS 1989; 39:4195-4200. [PMID: 9901749 DOI: 10.1103/physreva.39.4195] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
144
|
Aliotta F, Maisano G, Micali N, Migliardo P, Vasi C, Wanderlingh F, Triolo R, Smith GP. Depolarized Raman scattering in normal and supercooled antimony trichloride. J Chem Phys 1982. [DOI: 10.1063/1.443518] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
145
|
Giordano R, Maisano G, Mallamace F, Micali N, Wanderlingh F. Structural properties of macromolecular solutions. J Chem Phys 1981. [DOI: 10.1063/1.441912] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|