ppt quizzes Flashcards
This is created by streaking the yeast strain into an agar slant, which serves as a source of yeast for the entire production process?
working stock
The word “yeast” originates from the Old English term “gist,” which is related to a German word. What does “gist” mean?
dreg or foam
Saccharomyces cerevisiae can metabolize sugar both aerobically and anaerobically. What are the products of sugar metabolism under anaerobic conditions? [2]
ethanol and carbon dioxide
It is usually added as it improves activity of compressed yeast in
the dough system.
Thiamine)
In the preparation of fermenters and nutrient medium, what are the necessary components. [2]
Sterile molasses;
Growth factors
(T/F)Continuous process is usually used to maintain low sugar conc. during full aeration in the fermentation of baker’s yeast.
F
Commonly used equipment in drying [2]
Fluidized bed dryer;
Spray dryer
For the fermentation condition necessary for the fermentation of baker’s yeast, what temperature range is the process usually maintained at?
28-30 degrees celsius
What is the primary microorganism used in ethanol fermentaton?
Saccharomyces cerevisiae (yeast)
Which process is the first step that converts glucose into ethanol and carbon dioxide during
ethanol fermenta7on?
Glycolysis
What type of environment is necessary for ethanol fermenta7on to occur?
Anaerobic environment (absence of oxygen)
Which agricultural feedstocks are commonly used for ethanol fermentaton? [3]
starch-based,
sugar-based, and
lignocellulosic biomass or cellulose based
What is the by-product of ethanol fermentation that is often utlized in the beverage and biofuel industries?
Carbon dioxide (CO₂)
What is the term for the stage where yeast or other microorganisms are introduced into the
fermenta7on medium?
Inoculation
Which industry/product does ethanol fermenta7on is most commonly associated with?
Alcoholic beverage
What technique prevents contamination from unwanted microorganisms in the ethanol
fermentation process?
sterilization
What is phase of matter does citric acid take place at room temperature?
Solid Phase
What is the commonly employed technique for Citric Acid Production?
Submerged Fermentation or SmF
The leading technique for Citric Acid Production is responsible for about _% of world production.
80
Enumerate the three types of fermentation methods for Citric Acid Production.
Surface Fermentation,
Submerged Fermentation, and
Solid-state Fermentation
How many carboxyl groups does Citric Acid have?
Three
The leading technique for Citric Acid Production can be carried out in what systems?
Batch,
Continuous, or
Fed-batch systems
