Thermal kinetics of enzyme inactivation, color changes, and allicin degradation of garlic under blanching treatments

1. Measurements of visual purple regeneration in solution have been made by a procedure which minimized distortion of the results by other color changes so that density changes caused by the regenerating substance alone are obtained. 2. Bleaching a visual purple solution with blue and violet light causes a greater subsequent regeneration than does an equivalent bleaching with light which lacks blue and violet. This is due to a photosensitive substance which has a gradually increasing effective absorption toward the shorter wavelengths. It is uncertain whether this substance is a product of visual purple bleaching or is present in the solution before illumination. 3. The regeneration of visual purple measured at 560 mµ is maximal at about pH 6.7 and decreases markedly at more acid and more alkaline pH's. 4. The absorption spectrum of the regenerating material shows only a concentration change during the course of regeneration, but has a higher absorption at the shorter wavelengths than has visual purple before illumination. 5. Visual purple extractions made at various temperatures show no significant difference in per cent of regeneration. 6. The kinetics of regeneration is usually that of a first order process. Successive regenerations in the same solution have the same velocity constant but form smaller total amounts of regenerated substance. 7. In vivo, the frog retina shows no additional oxygen consumption while visual purple is regenerating.

Download Full-text

Thermal kinetics of pungency loss in relation to the quality of pickled garlic

International Journal of Food Science & Technology ◽

10.1111/j.1365-2621.2004.00787.x ◽

2004 ◽

Vol 39 (3) ◽

pp. 311-317 ◽

Cited By ~ 10

Author(s):

Luis Rejano ◽

Antonio de Castro ◽

Antonio H. Sanchez ◽

Francisco J. Casado ◽

Alfredo Montano

Keyword(s):

Thermal Kinetics ◽

Kinetics Of

Download Full-text

Thermal and non-thermal kinetics of defects and dopant in Si

2008 16th IEEE International Conference on Advanced Thermal Processing of Semiconductors ◽

10.1109/rtp.2008.4690560 ◽

2008 ◽

Author(s):

A. La Magna ◽

G. Fisicaro ◽

G. Mannino ◽

V. Privitera ◽

G. Piccitto ◽

...

Keyword(s):

Thermal Kinetics ◽

Kinetics Of

Download Full-text

Thermal kinetics of ber-phenol formaldehyde composite

10.1063/5.0061647 ◽

2021 ◽

Author(s):

Akshay Joshi ◽

Shyam Sundar Pareek ◽

R. Mangal ◽

Narendra Bhojak

Keyword(s):

Phenol Formaldehyde ◽

Thermal Kinetics ◽

Kinetics Of

Download Full-text

Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System

International Scholarly Research Notices ◽

10.1155/2014/141463 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9

Author(s):

R. K. Koul ◽

Shivani Suri ◽

Vishal Singh ◽

K. K. Bamzai

Keyword(s):

Grown Crystal ◽

Frequency Factor ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

Relevant Model ◽

X Ray ◽

Thermoanalytical Techniques ◽

Thermal Kinetics ◽

Symmetry Structure ◽

Kinetics Of

Synthesis of mixed gadolinium calcium heptamolybdate (GdCaHM) system in silica gel medium using single gel single tube technique has been successfully achieved. The grown crystal exhibits various morphologies, which includes spherulites, multifaceted, and square platelets. The nature of the grown material was established by X-ray diffraction (XRD) studies. Fourier transform infrared spectroscopy (FTIR) study signifies the presence of heptamolybdate (Mo7O24) and water symmetry structure, whereas energy dispersive X-ray analysis (EDAX) establishes the stoichiometric of the grown crystal as GdCaMo7O24·8H2O. The thermal behaviour was studied using the thermoanalytical techniques, which include thermogravimetry (TG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). Results obtained on the application of TG based models, namely, Horowitz-Metzger, Coats-Redfern, and Piloyan-Novikova, suggest the contracting cylindrical model as the relevant model for the thermal decomposition of the material. The kinetic parameters, namely, the order of reaction (n), activation energy (Ea), frequency factor (Z), and entropy (ΔS*), were also calculated using these three models.

Download Full-text