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Lab 10: Glycolysis and Fermentation What’s so sweet about Sugar?
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Objectives Discuss ATP and where the ‘energy’ is Describe what fermentation is and where the ‘energy’ is Design an experiment to ‘test’ fermentation Recognize/explain what happens in a RedOx reaction
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Thinking it Through CH 4 (methane) C 2 H 5 OH H 3 C-CH 2 -OH (ethanol) C 8 H 18 CH 3 (CH 2 ) 6 CH 3 (octane) H 2 O CO 2 Similarities in components/structure? Differences in behavior? Differences in structure?
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So where are ‘calories’? Energy (heat) needed to raise 1g water, 1 o C Saturated Fat
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RedOx Reactions
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OIL RIG OIL = Oxidation Is Loss RIG = Reduction Is Gain of electrons
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ATP
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Metabolic Pathways
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Glycolysis Glyco – glucose/sugar Lysis – “to loosen”, take apart
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Glycolysis Freeman, Scott. Biological Science. 4 th Edition.
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Glycolysis + fermentation Freeman, Scott. Biological Science. 4 th Edition.
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Glycolysis + Fermentation Freeman, Scott. Biological Science. 4 th Edition.
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Here’s the claim: Glycolysis – glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP
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Here’s the claim: Glycolysis – Fermentation – glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP pyruvic acid + NADH + => ethanol + CO 2 + 2NAD +
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Here’s the claim: Glycolysis – Fermentation – What can you test? Rank in terms of feasibility, safety, etc. glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP pyruvic acid + NADH + => ethanol + CO 2 + 2NAD +
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Here’s the claim: Glycolysis – Fermentation – What can you test? Rank in terms of feasibility, safety, etc. glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP pyruvic acid + NADH + => ethanol + CO 2 + 2NAD +
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Here’s the claim: Glycolysis – Fermentation – What can you test? Rank in terms of feasibility, safety, etc. What will glyco + ferment? How???? glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP pyruvic acid + NADH + => ethanol + CO 2 + 2NAD +
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Standard Protocol Pg. 10-7 of lab manual Change to 500 mL
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Here’s the claim: Glycolysis – Fermentation – What can you test? Rank in terms of feasibility, safety, etc. What will glyco + ferment? How/when to do CO 2, sugar, ETOH? glucose + 2ADP + 2P i + 2NAD + => 2 pyruvic acid + 2NADH + + 2ATP pyruvic acid + NADH + => ethanol + CO 2 + 2NAD +
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Sugar/CO 2 Presence? Appendix C ***READ APPENDIX C*** – REALLY (lots of helpful stuff…in the text) What about ETOH?
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Group discussion On what basis will you be drawing conclusions at the end of the experiment –making comparisons between the final result and...? What if we wanted to produce a lot of ETOH, or very little glucose?
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Optimizations Concept: limiting components. How do you max your yield (sensitivity) for: –Glucose (how might you limit in final solution?) –CO 2 (Maximize) –ETOH (Maximize) Use standard protocol (10-7) as a baseline and adjust amounts from there per your role (could there be too much bread?)
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Optimizations Concept: limiting components. How do you max your yield (sensitivity) for: –Glucose (how might you limit in final solution?) –CO 2 (Maximize) –ETOH (Maximize) Use standard protocol (10-7) as a baseline and adjust amounts from there per your role (could there be too much bread?) What do we do? Glucose groups – 1X or 2X?
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After Mixing What will your solution look like? –“murky”? How do you speed it up? What conditions do we WANT?
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First part 1) Yeast mixed with glucose solution 2) Take glucose pre-sample (in plastic tube) and place on ice – how much? Answer: see ‘candidate solution’ in protocol 3) Hook up BaOH glass tube to flask and follow protocol 4) Cook after sealing/taping Turn on hot plates
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After Cooking 1) BaOH outcome? 2) Take another yeast solution extract for sugar testing – how many do we have? Why? –How to get chunks out? –Follow Benedict’s protocol 3) Heat the beer…get ETOH – how to do so? –How to test?
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no heating parafilm!!! Thermometer should measure GAS temp, leave it up high! AFTER
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What did we prove? Consistent with…
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Next Week Assess: Glycolysis and fermentation Lab report: Fermentation with a Bullet –One/group in Dropbox
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