Apostila de bromatologia - Ciencialivre.pro.br
Apostila de bromatologia - Ciencialivre.pro.br
Apostila de bromatologia - Ciencialivre.pro.br
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3 ml da 2 a solução (tubo 2)<<strong>br</strong> />
Em cada um dos tubos adicionar:<<strong>br</strong> />
- 9,0 ml <strong>de</strong> água <strong>de</strong>stilada<<strong>br</strong> />
- 1,2 ml <strong>de</strong> sol <strong>de</strong> hidróxido <strong>de</strong> bário 0,3N<<strong>br</strong> />
- 1,2 ml <strong>de</strong> sol. sulfato <strong>de</strong> zinco a 5%<<strong>br</strong> />
- agitar os tubos e <strong>de</strong>ixar em repouso por 1 o min.<<strong>br</strong> />
- filtrar<<strong>br</strong> />
Doseamento:<<strong>br</strong> />
Usar para o doseamento 1,0 ml do extrato <strong>de</strong>s<strong>pro</strong>teininizado para açúcares<<strong>br</strong> />
redutores e 2,0 ml da sol. hidrolizada e <strong>de</strong>s<strong>pro</strong>teinizada para a sacarose, seguindo<<strong>br</strong> />
a seqüência da técnica usada na curva padrão.<<strong>br</strong> />
Curva Padrão <strong>de</strong> glicose:<<strong>br</strong> />
Tubos <strong>de</strong><<strong>br</strong> />
ensaio<<strong>br</strong> />
Sol. padrão<<strong>br</strong> />
<strong>de</strong> glicose<<strong>br</strong> />
(ml)<<strong>br</strong> />
Extr.<<strong>br</strong> />
Redutores<<strong>br</strong> />
(ml)<<strong>br</strong> />
Sol. hid.<<strong>br</strong> />
Sacarose<<strong>br</strong> />
(ml)<<strong>br</strong> />
H20 <strong>de</strong>st.<<strong>br</strong> />
(ml)<<strong>br</strong> />
Reativo<<strong>br</strong> />
cúprico<<strong>br</strong> />
(ml)<<strong>br</strong> />
********<<strong>br</strong> />
Reativo<<strong>br</strong> />
arsenomolíbdi<<strong>br</strong> />
co (ml)<<strong>br</strong> />
Branco ⎯ ⎯ ⎯ 2,0 1,0 1,0<<strong>br</strong> />
Padrão 1 0,2 ⎯ ⎯ 1,8 1,0 1,0<<strong>br</strong> />
Padrão 2 0,4 ⎯ ⎯ 1,6 1,0 1,0<<strong>br</strong> />
Padrão 3 0,6 ⎯ ⎯ 1,4 1,0 1,0<<strong>br</strong> />
Padrão 4 0,8 ⎯ ⎯ 1,2 1,0 1,0<<strong>br</strong> />
Padrão 5 1,0 ⎯ ⎯ 1,0 1,0 1,0<<strong>br</strong> />
Padrão 6 1,2 ⎯ ⎯ 0,8 1,0 1,0<<strong>br</strong> />
Amostra<<strong>br</strong> />
redutores<<strong>br</strong> />
Amostra<<strong>br</strong> />
sacarose<<strong>br</strong> />
⎯ 1,0 ⎯ 1,0 1,0 1,0<<strong>br</strong> />
⎯ ⎯ 2,0 ⎯ 1,0 1,0<<strong>br</strong> />
**** colocar os tubos em banho maria fervente por 20 min.<<strong>br</strong> />
- Esfriar em água gelada e colocar 1,0 ml do reativo arsenomolíobdico<<strong>br</strong> />
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