Transcript Alcoholic Fermentation

Anaerobic Cellular
Respiration
In a cow’s gut, your muscles
and a wine barrel.
Anaerobic Respiration
Respiration
WITHOUT
oxygen.
Net gain of 2
ATP
Lactic Acid Fermentation
Same use of
NADH in lactate
byproduct.
Lactic Acid Formation
The “Burn” DURING
hard exercise is lactic
acid.
Not the “burn” of
damaged muscle the
next day, this is
DURING.
When you “catch your
breath” lactic acid
turned back into pyruvic
acid then into CO2
through aerobic
respiration.
800 meters = really anaerobic
Jarmila Kratochvílová
1:53.28 1983
Czechoslovakia
Alcoholic Fermentation
NAD+ is
regenerated but
not used for
energy.
If NAD+ runs out
glycolysis stops.
Alcoholic Fermentation
Alcoholic Fermentation
Anaerobic respiration
that produces alcohol.
Equation
pyruvic acid  ethyl
alcohol + CO2
Alcoholic Fermentation
Nonreversible.
Cannot turn
Ethyl
Alcohol
back into
pyruvic
acid.
Alcoholic Fermentation
Happens in
Bacteria/yeast
People use these
bacteria/yeast for:
Making alcoholic
beverages
Bread making - why?
Alcoholic Fermentation
Bacteria often
present on fruit
already.
Ripe fruit has a lot of
sugar to turn into
alcohol.
Eventually run out why most wine is not
sweet.
Alcoholic Fermentation
Alcohol is poisonous to
bacteria.
After it accumulates to a
certain level it kills the
bacteria and you too.
Wine
Grapes + Bacteria =
Wine. Pretty simple.
In “real” champagne
where do the bubbles
come from?
Origin - Middle
East/Southern Europe
Kava
Chew, spit, ferment.
Or in some places grind with a pestle but
hey, which would be more fun?
Traditional Pacific Islander drink
Beer
Hops, barley, malt sugar + bacteria =
beer.
If you bottle flat beer before all the bacteria
are dead what will they put into the beer
other than alcohol?
Origin - Sumaria. Modern association with
Germany.
Vodka
Potatoes + bacteria + distillation =
vodka.
Russian/Polish
Saki
Made from rice by bacteria.
Japanese
Make it Yourself?
Bad Idea!
Making alcoholic beverages safely is
complex.
Try it yourself, especially as a teenager,
and you are very likely to make yourself
extremely sick with dangerous bacteria
and mold, perhaps worse – you could die.
Drinking even store-bought alcohol safely
and legally as a teenager is impossible.
Anaerobic Respiration
Facultative
anaerobes can
“choose” to use
anaerobic
respiration when
oxygen is not
available and then
switch back when
oxygen is available.
Lactic Acid Fermentation
O2
Krebs Cycle
Electron Transport Chain
CO2