Solid-State Surface Acidity and pH-Stability Profiles of Amorphous Quinapril Hydrochloride and Silicate Formulations

2010 ◽  
Vol 99 (6) ◽  
pp. 2786-2799 ◽  
Author(s):  
Shumet A. Hailu ◽  
Robin H. Bogner
Keyword(s):  
Solid State ◽  
Surface Acidity ◽  
Ph Stability ◽  
Quinapril Hydrochloride

scholarly journals Surface Acidity and Solid-State Compatibility of Excipients with an Acid-Sensitive API: Case Study of Atorvastatin Calcium

2014 ◽  
Vol 16 (2) ◽  
pp. 354-363 ◽  
Author(s):  
Ramprakash Govindarajan ◽  
Margaret Landis ◽  
Bruno Hancock ◽  
Larry A. Gatlin ◽  
Raj Suryanarayanan ◽  
...  
Keyword(s):  
Solid State ◽  
Surface Acidity ◽  
Atorvastatin Calcium

Production of Cellulase by Aspergillus niger FC-1 and its Application in Hydrolysis of Corncob Residues

2015 ◽  
Vol 1120-1121 ◽  
pp. 891-896
Author(s):  
Hui Qin Shi ◽  
Zhe Wei Zhao ◽  
Wei Yang ◽  
Di Wu ◽  
Yi Zhao ◽  
...  
Keyword(s):  
Solid State ◽  
Aspergillus Niger ◽  
Incubation Period ◽  
Solid State Fermentation ◽  
Glucose Concentration ◽  
Moisture Ratio ◽  
Ph Stability ◽  
Optimal Values ◽  
Hydrolysis Of

In this study,the cellulase-producing ability of Aspergillusniger FC-1 through solid-state fermentation (SSF) and characteristics of the cellulase were investigated. The maximum activities of total cellulase (FPase) and endoglucanase (CMCase) were 8.2 and 31.5 IU per gram of dried substrate respectively after 96-h incubation period. The activities of both FPase and CMCase produced by Aspergillus niger FC-1 exhibited the optimal values at pH 5.5 and 50°C(as shown in Fig.2). Thermostability and pH stability of the enzymes were respectively appreciable at temperature ranging from 45°C to 55°C, pH ranging from 5.0 to 5.5. In addition, with an optimal 1:10 (w/v) substrate to moisture ratio (a cellulase loading of 8.5 FPU per cellulose), the glucose concentration was as high as 36.6 g glucose l-1 for a 48 h hydrolysis of corncob residues.

scholarly journals Surface acidity of tin dioxide nanomaterials revealed with 31P solid-state NMR spectroscopy and DFT calculations

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 25004-25009
Author(s):  
Wenjing Zhang ◽  
Zhiye Lin ◽  
Hanxiao Li ◽  
Fang Wang ◽  
Yujie Wen ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Dft Calculations ◽  
Solid State Nmr ◽  
Tin Dioxide ◽  
Surface Acidity ◽  
Solid State Nmr Spectroscopy

Facet-dependent acidity of SnO2 nanosheets and nanoshuttles is revealed with TMP-assisted 31P solid-state NMR spectroscopy and DFT calculations.

Dispersible composites of exfoliated graphite and polyaniline with improved electrochemical behaviour for solid-state chemical sensor applications

RSC Advances ◽  
2014 ◽  
Vol 4 (86) ◽  
pp. 46340-46350 ◽  
Author(s):  
Zhanna A. Boeva ◽  
Konstantin A. Milakin ◽  
Markus Pesonen ◽  
Aleksander N. Ozerin ◽  
Vladimir G. Sergeyev ◽  
...  
Keyword(s):  
Solid State ◽  
Chemical Sensor ◽  
Aqueous Electrolyte ◽  
Electrochemical Behaviour ◽  
Electrolyte Solutions ◽  
Ph Stability ◽  
Exfoliated Graphite ◽  
Sensor Applications ◽  
State Chemical ◽  
Graphite Composites

The PANI–graphene/graphite composites show improved pH stability and electrochemical behaviour in aqueous electrolyte solutions at pH ≤ 8.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

The Collagenic Molecular Structural Unit of Solid State Complexes

1971 ◽  
Vol 29 ◽  
pp. 478-479
Author(s):  
Kenneth M. Richter ◽  
John A. Schilling
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Structural Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naoh Treatment

The structural unit of solid state collagen complexes has been reported by Porter and Vanamee via EM and by Cowan, North and Randall via x-ray diffraction to be an ellipsoidal unit of 210-270 A. length by 50-100 A. diameter. It subsequently was independently demonstrated by us in dog tendon, dermis, and induced complexes. Its detailed morphologic, dimensional and molecular weight (MW) aspects have now been determined. It is pear-shaped in long profile with m diameters of 57 and 108 A. and m length of 263 A. (Fig. 1, tendon, KMnO4 fixation, Na-tungstate; Fig. 2a, schematic of unit in long, C, and x-sectional profiles of its thin, xB, and bulbous, xA portions; Fig. 2b, tendon essentially unmodified by ether and 0.4 N NaOH treatment, Na-tungstate). The unit consists of a uniquely coild cable, c, of ṁ 22.9 A. diameter and length of 2580-3316 A. The cable consists of three 2nd-strands, s, each of m 10.6 A.

Structure-property relations of liquid crystalline polymers

1987 ◽  
Vol 45 ◽  
pp. 460-463
Author(s):  
Linda C. Sawyer
Keyword(s):  
Solid State ◽  
Liquid Crystalline ◽  
Structural Model ◽  
Crystalline Polymer ◽  
Liquid Crystalline Polymers ◽  
Mechanical Anisotropy ◽  
Structure Property ◽  
Preparation Methods ◽  
Crystalline Polymers ◽  
Extended Chain

Recent liquid crystalline polymer (LCP) research has sought to define structure-property relationships of these complex new materials. The two major types of LCPs, thermotropic and lyotropic LCPs, both exhibit effects of process history on the microstructure frozen into the solid state. The high mechanical anisotropy of the molecules favors formation of complex structures. Microscopy has been used to develop an understanding of these microstructures and to describe them in a fundamental structural model. Preparation methods used include microtomy, etching, fracture and sonication for study by optical and electron microscopy techniques, which have been described for polymers. The model accounts for the macrostructures and microstructures observed in highly oriented fibers and films.Rod-like liquid crystalline polymers produce oriented materials because they have extended chain structures in the solid state. These polymers have found application as high modulus fibers and films with unique properties due to the formation of ordered solutions (lyotropic) or melts (thermotropic) which transform easily into highly oriented, extended chain structures in the solid state.

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