Pressure effects on inter- and intramolecular vibrations in hydrogen-bondedL-ascorbic acid crystal

2007 ◽  
Vol 39 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Hiroko Shimada ◽  
Yoshinori Nibu ◽  
Ryoichi Shimada
Keyword(s):  
Ascorbic Acid ◽  
Pressure Effects ◽  
Acid Crystal ◽  
Intramolecular Vibrations

Hydration and Pressure Effects on the Inter- and Intramolecular Vibrations of Tetramethylpyrazine Crystals

1996 ◽  
Vol 69 (8) ◽  
pp. 2179-2183 ◽  
Author(s):  
Masayoshi Maehara ◽  
Yoshio Suzuki ◽  
Hideki Mizobe ◽  
Hiroshi Kawano ◽  
Yoshinori Nibu ◽  
...  
Keyword(s):  
Pressure Effects ◽  
Intramolecular Vibrations

ChemInform Abstract: 6-Deoxy-6-fluoro-L-ascorbic Acid: Crystal Structure and Oxidative Degradation.

ChemInform ◽  
2001 ◽  
Vol 32 (4) ◽  
pp. no-no
Author(s):  
Janusz Madaj ◽  
Yoko Nishikawa ◽  
V. Prakash Reddy ◽  
Peter Rinaldi ◽  
Tadao Kurata ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ascorbic Acid ◽  
Oxidative Degradation ◽  
Acid Crystal

scholarly journals Dynamical Properties in Uniform and Periodic Growth Modes of Ascorbic Acid Crystal Domain from Thin Solution Film

2014 ◽  
Vol 83 (6) ◽  
pp. 064002 ◽  
Author(s):  
Yoshihiro Yamazaki ◽  
Mitsunobu Kikuchi ◽  
Akihiko Toda ◽  
Jun-ichi Wakita ◽  
Mitsugu Matsushita
Keyword(s):  
Ascorbic Acid ◽  
Acid Crystal ◽  
Growth Modes ◽  
Periodic Growth ◽  
Dynamical Properties

scholarly journals THERMAL CHARACTERISTIC EVALUATION OF DIFFERENT ASCORBIC ACID CRYSTAL HABITS

2018 ◽  
Vol 3 (1) ◽  
pp. 50-59
Author(s):  
S. Hassan ◽  
F. Adam ◽  
M.R. Abu Bakar
Keyword(s):  
Thermal Stability ◽  
Hydrogen Bond ◽  
Ascorbic Acid ◽  
Thermal Characteristic ◽  
Intermolecular Forces ◽  
Crystal Habit ◽  
Gravimetric Analysis ◽  
High Hydrogen ◽  
Acid Crystal ◽  
Thermal Stability Of

Melting temperature (Tmelt) and enthalpy of fussion (ΔHf ) are important parameters to determine the quality and the thermal stability of active pharmaceutical ingredient (API) crystals. In this study, different habit of ascorbic acid was prepared by using different polar solvents namely water, methanol, ethanol and 2-propanol. Ascorbic acid crystal was then been physically and thermally characterised by using microscopic analysis, thermo gravimetric analysis (TGA) and differential scanning calometry analysis (DSC). This provides an insight into the formation of crystal habit across four different polar protic solvents. The ascorbic acid is found to grow as a cubic or prism crystal when grown in water that provides high hydrogen bond between solvent and solute. As the polarity of the solvents decrease, the hydrogen bond weaken and the width of the crystal become narrower, forming almost a needle like crystal. The thermal stability of ascorbic acid crystal is found to be the most stable when ascorbic acid is crystallized from water (prism) and the weakest from 2-propanol (needle) due to the molecule arrangement in crystal lattice in which resulted from decreasing intermolecular forces in the liquid phase

Humidity–Temperature Dependence of Domain Growth of Ascorbic Acid Crystal

2009 ◽  
Vol 78 (7) ◽  
pp. 074001 ◽  
Author(s):  
Yoshihiro Yamazaki ◽  
Hiroki Yoshino ◽  
Machiko Izui ◽  
Yukiko Sato ◽  
Mitsugu Matsushita
Keyword(s):  
Ascorbic Acid ◽  
Temperature Dependence ◽  
Domain Growth ◽  
Acid Crystal

6-Deoxy-6-fluoro-l-ascorbic acid: crystal structure and oxidative degradation

2000 ◽  
Vol 329 (2) ◽  
pp. 477-485 ◽  
Author(s):  
Janusz Madaj ◽  
Yoko Nishikawa ◽  
V.Prakash Reddy ◽  
Peter Rinaldi ◽  
Tadao Kurata ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ascorbic Acid ◽  
Oxidative Degradation ◽  
Acid Crystal

Comparative Study of Ascorbic Acid Levels in Gastric Secretion, Blood, Urine and Saliva

1951 ◽  
Vol 18 (2) ◽  
pp. 224-229 ◽  
Author(s):  
Joseph T. Freeman ◽  
Roberta Hafkesbring
Keyword(s):  
Ascorbic Acid ◽  
Gastric Secretion ◽  
Comparative Study
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