F0, B* and C* for ESL Dairy Products |
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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Posted: 14 Nov 2011 at 9:02pm |
I have added a highly flexible B*and C* calculator that also calculates F0 values for UHT-treated milk. The calculator allows users to set time intervals in either seconds or minutes at predetermined temperatures. This calculator along with the other two thermal processing calculators should enable the lethal effects of most thermal processes to be evaluated. The calculator is at www.dairyscience.info/uht1.asp .
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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Welcome back, and thanks for the suggestion.
Prior to Ryan's post I would not have anticipated anyone wanting this sort of calculator. I will think about your request and let you know what I decide. I suppose I wonder just how much use this calculator would be?
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mstrange
Newbie Joined: 30 Nov 2010 Status: Offline Points: 4 |
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Could you change your C* calculator to allow cals of a few holding times eg 3 min at say 123 C and say 10 secs at 90C?
This would be much used by us. Please!
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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Ryan
Apologies. I misread your post, you wrote 125 not 121C. Please replace the 121 with 125. Sorry if I have confused you. |
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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I intend to add an article on ESL and UHT milk and will
cover the calculation of C* and B* over the next month or so. B*and C* are calculated in a similar way to F0 except that
the reference temperature, z-value and the time taken to give a value of 1 are
different. B*=1 is obtained by using a z-value of 10.5 °C, a reference
temperature of 135 °C and a holding time equivalent to 10.5 seconds and
represents a log 9 reduction in thermophilic spores. The C* value measures the chemical effect of high
temperature processing and is concerned with thiamine destruction. A reference
temperature of 135 °C, a Z-value of 31.4 °C and a holding time of 30.5 seconds
are required to give a C*=1; this corresponds to a 3 % reduction in the
thiamine concentration in the food being processed. I think you want to calculate the B* and C* values resulting
from heating a food in a retort at 121°C for 7 minutes? B* and C* values
are normally used for UHT processing and I don’t understand why you are using
them for a product produced at a much lower temperature. To calculate B* enter the following into Excel: =10^((121-135)/10.5)*7*60/10.1. Note the 7 minutes have
been converted to seconds. To calculate C* enter the following into Excel: =10^((121-135)/31.4)*420/30.5. |
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Ryan
Newbie Joined: 10 Nov 2011 Status: Offline Points: 1 |
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I'm sorry Mr Michael
I Want to ask how to calculate B* and C* if i used retort what formula should i used my product is dairy, and my parameter retort is 125 C & 7 menit Thank you for your attention I'm very need your help |
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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The free On Line calculator to determine F0, B*, C* values and predicted lactulose concentrations following the UHT-treatment of milk has been added.
Note the B* values will usually require adjustment to allow for for the flow conditions in the heat processing plant. This usually means reducing them by a factor of 2 (Tran et al, 2008). I will add a tutorial explaining how to do this.
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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I will provide a spread sheet that enables Fo, B* and C* to be calculated for extended shelf life dairy products within the next few weeks.
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formula123
Admin Group Administrator Joined: 01 Sep 2009 Location: N. Ireland Status: Offline Points: 390 |
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I received the query below yesterday: "Can you please provide the calculator (Fo calculator) to calculate F0, B* and C* for ESL Dairy products. I am particularly interested in custard, stabilised thickened cream and milk".
Need much more information before I can do this? Please provide some more information.
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