Alur Perc. 4 Dan 5.docx

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1. Reaksi warna pada protein a. Reaksi Biuret

b. Reaksi Xantoprotein

3 mL larutan protein

3 mL larutan protein - Dimasukkan dalam tabung reaksi - Ditambah 1mL HNO3 pekat - Dipanaskan

-Dimasukkan dalam tabung reaksi -Ditambah 1 mL NaOH 4%

Larutan kuning

- Didinginkan - Ditambah ammonia hingga warna jingga

-Ditambah bertetes tetes CuSO4 0,5%

Warna jingga

Larutan merah/ungu

c. Reaksi Ninhidrin

d. Reaksi Millon

Larutan protein -Diatur pH nya sampai pH 7 -Diambil 1 mL -Ditambah 10 tetes larutan ninhidrin 0,2 % o

-Dipanaskan pada suhu 100 C selama 10 menit -Diamati perubahan warna yang

3 mL larutan protein - Dimasukkan dalam tabung reaksi 2 - Ditambah 1mL pereaksi merkuri sulfat - Dipanaskan

Endapan kuning - Didinginkan - Ditambah 1 tetes NaNO3 1 % - Dipanaskan

terjadi

Warna merah Hasil

e.Reaksi Hopkin Gle 1 mL larutan protein -Dimasukkan dalam tabung reaksi -Ditambah 1 tetes formaldehid encer -Ditambah 1 tetes pereaksi merkuri sulfat -Ditambah 1 mL H2SO4 pekat cincin ungu pada bidang batas - dikocok Larutan berwarna ungu 2. Hidrolisis Protein 1 mL larutan protein -Dimasukkan dalam tabung reaksi -Ditambah 1 mL larutan NaOH 40% -Dipanaskan selama 1 menit -Ditambah 1 tetes Pb-asetat endapan PbS berwarna hitam

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