Pati Talas

Diketahui :

Bobot Sampel = 3000 mg Volume titrasi sampel (A ml) = 4.9 ml

Volume titrasi blanko pengujian (B ml) = 24ml

Normalitas Na2S2O3 = 0,105 N

Faktor Pengenceran = 50

Angka Tabel (mg glukosa) = (B ml – A ml) x (Normalitas Na2S2O3 terstandardisasi / 0,1)

= (24 ml – 3.8 ml) x (0,105 N / 0,1)

= ( 20.2 ml) x (1.05 ) = 21.21

Angka Tabel penetapan sakarosa menurut luff-scrool

Mili Na2S2O3 glukosa

22 59.1

21 56.1

= 56.1 + ( 59.1 - 56.1 ) x 0.21 = 56.73 mg

Kadar Pati  = (mg glukosa x Faktor Pengenceran) / (Bobot Sampel Uji (mg)) x 100%

= (56.73 x 50 ) / (3000) x 100%

= (2835.5) / (3000 ) x 100%

= 0.9455 x 100% = 94.55 %

Kadar Pati = 0.9 x glukosa

= 0.9 x 94.55

= 85.09 %

Kadar Amilosa

kons absor

10 0,042

20 0,376

30 0,837

40 1,106

50 1,548Kurva Standar Amilosa

Perhitungan Kadar Amilosa

Y= 0.037 x – 0.340Y=0.042 + 0.340 0.037Y=10.32 Kadar Amilosa (%b/b) = C x V x FP x 100

W Kadar Amilosa (%b/b) = 10.32 x 2 x 1 x 100

100 = 20.64 %

Kadar Amilopektin = % kadar Pati - % kadar Amilosa= 85.09 – 20.64= 64.45