Dear List Member,
We are finishing a paper on a NEW Evaluation Technique for
Commercial Sterilization Processes. As some of you are aware
on last IFTPS meeting as well as IFT meeting 2002 We presented
our research study entitled BIGELOW´S GENERAL METHOD
REVISITED. To give it the necessary strength I ask you to provide
us Thermal Processing Data to further test this new procedure. If you
are
able to send the requested data, We will send you a file with your
data evaluated with the traditional Formula Method as well as with
this new procedure (Revisited General Method). Also we will send you a
copy of the paper on PDF format.
DATA FORMAT
We are requesting heat penetration data as follow:
Cold Spot temperature against time (hopefully an Excel file)
Retort temperature against time (hopefully an Excel file)
Can Format (e.g. 307 x 409)
Initial temperature
Warm regards,
Ricardo Simpson, Ph.D.
Associate Professor
Universidad Santa Maria
CHILE
PD: I have paste the ABSTRACT of our research study as was presented in
the last IFT meeting.
BIGELOW’S GENERAL METHOD REVISITED: DEVELOPMENT
OF A NEW CALCULATION TECHNIQUE
Simpson1, R., Almonacid1, S., Acevedo1, C., and Teixeira2, A.
1 Departamento de Procesos Químicos, Biotecnológicos, y Ambientales;
Universidad Técnica Federico Santa María; Casilla 110-V; Valparaíso,
Chile
2 Agricultural & Biological Engineering Department, Frazier Rogers Hall,
P. O. Box 110570 4, University of Florida, Gainesville, Florida
32611-0570
ABSTRACT
Thermal processing of foodstuffs should aim at maximizing the
destruction of microbial organisms and spores to produce
microbiologically safe products while reducing the loss of quality
factors and reducing processing time.
The objective of this research study was to develop a comprehensive
procedure to fully implement the General Method (developed by W.D.
Bigelow during the 1920s) in a computer program and with the complement
of heat transfer theory enhance its ability to manage different
processing conditions (i.e. RT).
A general computer-based procedure was developed to fully implement the
Bigelow General Method. The procedure included: a) Evaluation of thermal
processes data (obtained experimentally and/or by simulation), b)
Evaluation of thermal processes data for a specified F value, and c)
Evaluation of thermal processes data for different conditions than the
experimentally recorded temperature (retort temperature RT, initial
temperature IT, etc.). The new procedure was experimentally validated
and extensively tested against the formula method.
In many cases reduction in process time evaluation was found when the
new procedure was compared with the traditional and improved formula
methods. Reduction in process time was due to the advantage of this
procedure into accurately considering the lethality of come-up time
(C.U.T.) and also because its accuracy in the cooling step evaluation.
The new calculation technique has the same ease of use as Ball's Formula
Method but with better accuracy.
This archive was generated by hypermail 2b29 : Fri Aug 16 2002 - 06:18:51 PDT