Lecture20 - 1 Fermentation The Production of Beer BIOCHEM...

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Unformatted text preview: 1 Fermentation The Production of Beer BIOCHEM 227 FALL 2010 Lecture 20 Monday, October 18, 2010 TODAY • Continued: pentose phosphate pathway • Fermentation • Biochemistry of beer BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 2 Pentose Phosphate Pathway Pentose Phosphate Pathway • Nonoxidative phase – When only the NADPH is needed, this recycles ribose to glucose-6-phosphate – Direct conversion would require energy/reduction • No point in doing that – Instead, six pentoses are converted to five hexoses • No energy input • Catalyzed by transketolase and transaldolase – Same reactions are reversed in the dark reactions of photosynthesis BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 3 Nonoxidative Pathway Nonoxidative Pathway BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 4 Transaldolase Transketolase BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 5 Pentose Phosphate Pathway Fermentation BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 6 Anaerobic Metabolism & NADH • In anaerobic metabolism, there is no electron acceptor, so oxidation is not possible • NADH accumulates, and the cell runs out of NAD + Fermentation • Process of recycling NADH to NAD + (oxidation of NADH) • A carbon compound is reduced • Nothing useful is done with the electrons • A small amount of energy is obtained from glucose by glycolysis BCH 227 FALL 2010 LECTURE 20: FERMENTATION; PRODUCTION OF BEER 18 OCT 2010 7...
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This note was uploaded on 12/19/2010 for the course BIOCHEM 227 taught by Professor Coggins during the Fall '10 term at Duke.

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Lecture20 - 1 Fermentation The Production of Beer BIOCHEM...

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