Proposta didática_221121_220346.pdf

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O documento descreve como a fermentação do leite em iogurte ocorre através da hidrólise da lactose em ácido lático pelos microrganismos Lactobacillus bulgaricus. A produção de ácido lático desnatura a caseína no leite, fazendo-a precipitar e formar o iogurte. A lactose é convertida em ácido lático através da glicólise e fermentação láctica realizada pelos microrganismos no leite.

Ciências

Proposta didática
Fermentação
Disciplina: Química II
Professora: Danielle Maria P. de Oliveira Santos
Alunos: Jonatan Pinto Cavalcante eTaís Cristina de Lima Guimarães

CONTEXTUALIZANDO A PROPOSTA
Currículo mínimo - 2012
Recorte do currículo mínimo de Química do 3º ano - 4º bimestre
Disponível em: https://seeduconline.educa.rj.gov.br/curr%C3%ADculo-b%C3%A1sico

QUESTÃO:
COMOACONTECEATRANSFORMAÇÃO
DO LEITE EM IOGURTE?
NA AULA
ANTERIOR...
BIOMOLÉCULAS
CARBOIDRATOS
CARACTERÍSTICAS
COMPOSIÇÃO E FUNÇÕES
TIPOS E EXEMPLOS

Alguns microrganismos, como Lactobacillus bulgaricus,
em anaerobiose fermentam a lactose do leite a ácido
láctico. A produção de ácido desnatura a caseína
(proteína) do leite e faz com que ela precipite.
IOGURTE
NOVAS QUESTÕES:
Como a lactose se
converte em ácido
láctico ?
Como a produção de
ácido láctico resulta
na produção de leites
fermentados como o
iogurte?
LEITE

GLICÓLISE
• Envolve 10 reações enzimáticas;
• Ocorre no citosol;
• 11 metabólitos;
• Dividida em 2 Fases:
Fase preparatória
- Aprisionamento e desestabilização da glicose
- Investimento de 2 moléculas de ATP
Fase de Extração - Pagamento
- Produção de 2 moléculas de ATP e 2 moléculas de
NADH

GLICÓLISE
Piruvato pode seguir três caminhos:
I. Ser reduzido a etanol: fermentação alcóolica.
II. Ser reduzido a lactato: fermentação láctica.
III. Ser completamente oxidado a CO2 e H2O:
ciclo do ácido cítrico.

FERMENTAÇÃO LÁCTICA
Lactato desidrogenase:
catalisa a oxidação do NADH e
redução do piruvato a lactato
Reação reversível
Ocorre em:
- eritrócitos; músculo em contração vigorosa e
microrganismos.
O lactato pode ser exportado
da célula ou convertido
(novamente) a piruvato.
Grande parte do lactato é
transportado pelo sangue
até o fígado, onde é usado
na síntese de glicose (Ciclo
de Cori).

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Proposta didática_221121_220346.pdf

1. Proposta didática Fermentação Disciplina: Química II Professora: Danielle Maria P. de Oliveira Santos Alunos: Jonatan Pinto Cavalcante eTaís Cristina de Lima Guimarães

2. CONTEXTUALIZANDO A PROPOSTA Currículo mínimo - 2012 Recorte do currículo mínimo de Química do 3º ano - 4º bimestre Disponível em: https://seeduconline.educa.rj.gov.br/curr%C3%ADculo-b%C3%A1sico

3. QUESTÃO: COMOACONTECEATRANSFORMAÇÃO DO LEITE EM IOGURTE? NA AULA ANTERIOR... BIOMOLÉCULAS CARBOIDRATOS CARACTERÍSTICAS COMPOSIÇÃO E FUNÇÕES TIPOS E EXEMPLOS

4. Alguns microrganismos, como Lactobacillus bulgaricus, em anaerobiose fermentam a lactose do leite a ácido láctico. A produção de ácido desnatura a caseína (proteína) do leite e faz com que ela precipite. IOGURTE NOVAS QUESTÕES: Como a lactose se converte em ácido láctico ? Como a produção de ácido láctico resulta na produção de leites fermentados como o iogurte? LEITE

5. HIDRÓLISE DA LACTOSE

6. GLICÓLISE • Envolve 10 reações enzimáticas; • Ocorre no citosol; • 11 metabólitos; • Dividida em 2 Fases: Fase preparatória - Aprisionamento e desestabilização da glicose - Investimento de 2 moléculas de ATP Fase de Extração - Pagamento - Produção de 2 moléculas de ATP e 2 moléculas de NADH

7. GLICÓLISE

8. GLICÓLISE Piruvato pode seguir três caminhos: I. Ser reduzido a etanol: fermentação alcóolica. II. Ser reduzido a lactato: fermentação láctica. III. Ser completamente oxidado a CO2 e H2O: ciclo do ácido cítrico.

9. FERMENTAÇÃO LÁCTICA SIMULADOR

10. FERMENTAÇÃO LÁCTICA Lactato desidrogenase: catalisa a oxidação do NADH e redução do piruvato a lactato Reação reversível Ocorre em: - eritrócitos; músculo em contração vigorosa e microrganismos. O lactato pode ser exportado da célula ou convertido (novamente) a piruvato. Grande parte do lactato é transportado pelo sangue até o fígado, onde é usado na síntese de glicose (Ciclo de Cori).

11. FERMENTAÇÃO LÁCTICA

12. FERMENTAÇÃO LÁCTICA

13. FERMENTAÇÃO LÁCTICA CICLO DE CORI

14. FERMENTAÇÃO LÁCTICA EXPERIMENTO

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