Food engineering/biology

posted by .

Can anyone help me out with this problem. For part a i understand i plot microbial numbers against time on semi log paper to determine D value for the two temperatures. But i'm unsure how to do part b.
Alicyclobacillus acidoterrestris is a quite hat resistant microorganism that has been causing problems in the fruit juice industry.Data below shows the thermal inactivation data determined experimentally for A. acidoterrestris spores in orange juice at 85.2‹ and 91‹C.

85.2 degrees celcius
Time Spore concentration
(min) in the juice N (cfu/ml)

0 min 1.9* 10^7
20 min 1.6* 10^7
40 min 9.1* 10^6
60 min 7.9* 1^0^6
80 min 4.8* 10^6
120 min 6.2* 10^5
160 min 8.9*10^4
180 min 5.5*10^4

91 degrees celcius
time (min) Spore concentration
in the juice N (cfu/ml)
0 min 1.7*10^7
2 min 8.1*10^6
5 min 4.0*10^6
8 min 2.6*10^6
11 min 1.8*10^6
14 min 8.0*10^5
16 min 5.9*10^5
18 min 2.6*10^5
21 min 2.8*10^5
a. Determine thermal resistance parameters of Alicyclobacillus acidoterrestris in the orange juice.
b. Suggest an appropriate P91‹C]value for this juice.


Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. TRig WIth LoGs help1!!

    i have problem i can't solve and the book is no help.. anyone got osme hints or somehting i could start off doing?
  2. Math!

    Factoring Completely! 13b^2-13 I got (13b-13)(1b-1). On my test my teacher said it was party wrong.And she underlined the two Thirteen's i had in my answer. And i don't understand why!?
  3. Logs.

    Can you please help me with the following log. problems?
  4. Algebra

    Determine whether the given numbers are solutions of the inequality. t - 8 > 2t - 3 The given numbers are: 0, 3.3, -9, -3 I understand the problem and how to figure it out. Its just that when I tried this problem, none of the numbers …
  5. Biology Research Paper

    Is this alright as my 'hooking' beginning?
  6. statistics

    Hey. I am having problem with stem leaf plot diagram. Heres the data I need to make steam leaf plot out of: 1.7 5.7 7.6 8.7 9.8 12.0 13.2 13.6 14.6 15.8 16.0 17.5 19.3 21.5 21.8 23.8 24.4 27.7 33 33.0 34.4 35.4 Can someone tell me …
  7. microbiology

    How do i plot a semi log graph for OD vs. time?
  8. Chem

    Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded below. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear …
  9. Chemistry

    When solutions of two reactants were mixed in a coffee-cup calorimeter, the following temperatures were recorded as a function of time. Plot the data on one of the available pieces of graph paper. Obtain tf, the final temperature, …
  10. College alegbra

    A rancher wants to create a fence enclosing 1500 m2 of land. The plot will be divided into two equal areas by an additional fence parallel to two sides as shown in the diagram below. Find the dimensions of the plot which results in …

More Similar Questions