Exam 1 (part 2) Flashcards Preview

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Flashcards in Exam 1 (part 2) Deck (18):
1

formula for water activity: Aw=

Vapor pressure of food/vapor pressure of pure water at the same temperature

2

3 types of stress response

Homeostatic response
Acid tolerance response
synthesis of acid shock proteins

3

Solutes which Gram + bacteria "horde" to combat dryness

proline or glycine betaine

4

Solutes which Gram - bacteria "horde" to combat drying out

K+ and glutamic acid

5

poising capacity:

resistance to change in Eh

6

Eh

Oxidation-reduction potential

7

Oxidized foods have a _______ Eh value

positive

8

Anaerobes grow rapidly under ________ conditions

reduced

9

Milk lactoperoxidase system requires three components

Lactoperoxidase
thiocyanate
Hydrogen peroxide

10

Milk lactoperoxidase is good at inhibiting

psychrotrophic G-'s such as Pseudomonas spp

11

protein in egg that chelates iron, copper and zinc

conalbumen

12

3 extrinsic parameters

Temperature
Relative humidity
Atmosphere

13

antimicrobial protein in milk

lactoferrin

14

What does lysozyme degrade?

peptidoglycan

15

What enzyme do Milk and eggs both contain

Lysozyme

16

Plants fruits and vegetables produce

hydroxynnamic acid

17

hydroxynnamic acid inhibits

bacteria and some fungi

18

lactic fermentation of foods can result in the synthesis of several natural inhibitors including

organic acids
H2O2
bacteriocins