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Kaluza S, Muhler M. On the precipitation mechanism and the role of the post-precipitation steps during the synthesis of binary ZnO–Al2O3 composites with high specific surface area. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b902004g] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Potentiometric determination of the ‘formal’ hydrolysis ratio of aluminium species in aqueous solutions. Anal Chim Acta 2008; 607:61-73. [DOI: 10.1016/j.aca.2007.11.026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2007] [Revised: 11/13/2007] [Accepted: 11/13/2007] [Indexed: 11/22/2022]
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Gainotti A, Losi E, Colombo P, Santi P, Sonvico F, Baroni D, Massimo G, Colombo G, Del Gaudio P. The effect of residual water on antacid properties of sucralfate gel dried by microwaves. AAPS PharmSciTech 2006; 7:E58-E63. [PMID: 16584168 PMCID: PMC2750716 DOI: 10.1208/pt070109] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2005] [Accepted: 12/05/2005] [Indexed: 11/30/2022] Open
Abstract
The aim of this work was to study the acid neutralization characteristics of microwave-dried sucralfate gel in relation to the water content and physical structure of the substance. Several dried sucralfate gels were compared with humid sucralfate gel and sucralfate nongel powder in terms of neutralization rate and buffering capacity. Humid sucralfate gel and microwave-dried gel exhibited antacid effectiveness. In particular, the neutralization rate of dried gel powders was inversely related to the water content: as the water content of dried powders decreased, the acid reaction rate linearly increased. The relationship was due to the different morphology of dried sucralfate gels. In fact, the porosity of the dried samples increased with the water reduction. However, the acid neutralization equivalent revealed that the dried sucralfate gel became more resistant to acid attack in the case of water content below 42%. Then, the microwave drying procedure had the opposite effect on the reactivity of the aluminum hydroxide component of dried sucralfate gel powders, since the rate of the reaction increased whereas the buffering capacity decreased as the amount of water was reduced.
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Affiliation(s)
- Alessandro Gainotti
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Elena Losi
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Paolo Colombo
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Patrizia Santi
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Fabio Sonvico
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Daniela Baroni
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Gina Massimo
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
| | - Gaia Colombo
- />Department of Pharmaceutical Sciences, University of Ferrara, via Fossato di Mortara 17-19, I-44100 Ferrara, Italy
| | - Pasquale Del Gaudio
- />Department of Pharmacy, University of Parma, Parco Area delle Scienze 27/A, I-43 100 Parma, Italy
- />Department of Pharmaceutical Sciences, University of Salerno, via Ponte don Melillo, I-84084 Fisciano, (SA), Italy
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