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International Starch Institute
Science Park Aarhus, Denmark
ISI 06 Table 2a - Determination of Dry Matter in Dual Converted 32 DE Syrup by Refractive Index

1. Scope The table is applicable to 32 DE dual converted syrup with 0.4% ash on dry matter. LT 24 Nov. 1997
2. Principle The refractive index of sample is transformed to dry matter by a table.
3. Apparatus 3.1 Refractometer with thermostat
4. Procedure Adjust temperature of refractometer (3.1) to 20, 30, 45 or 60 oC. +/- 0.2 oC
Adjust sample temperature to that chosen for the refractometer.
Place a few drops of sample on fixed prism and close instrument Work fast
Read the refractive index (nD) to nearest 0.0002 unit. Clean prisms immediately after.
5. Calculation Find dry matter (DM) in percent of sample (average results of two samples with no decimal) by using table: Correct eventually for differing DE

DM%

20 oC

30 oC

45 oC

60 oC

0

1,33194

1,33194

1,32985

1,32725

2

1,33594

1,33487

1,33275

1,33012

4

1,33899

1,33788

1,33573

1,33308

6

1,34208

1,34095

1,33876

1,33608

8

1,34522

1,34406

1,34184

1,33914

10

1,34841

1,34723

1,34498

1,34225

12

1,35166

1,35045

1,34816

1,34541

14

1,35495

1,35372

1,35140

1,34863

16

1,35830

1,35704

1,35469

1,35190

18

1,36171

1,36042

1,35804

1,35522

20

1,36517

1,36385

1,36144

1,35860

22

1,36868

1,36734

1,36490

1,36204

24

1,37225

1,37088

1,36841

1,36554

26

1,37587

1,37448

1,37199

1,36909

28

1,37956

1,37814

1,37562

1,37270

30

1,38330

1,38186

1,37931

1,37637

32

1,38710

1,38564

1,38306

1,38010

34

1,39097

1,38948

1,38687

1,38390

36

1,39489

1,39338

1,39074

1,38775

38

1,39888

1,39734

1,39468

1,39167

40

1,40293

1,40137

1,39868

1,39566

42

1,40704

1,40546

1,40275

1,39971

44

1,41122

1,40962

1,40688

1,40383

46

1,41547

1,41384

1,41108

1,40801

48

1,41978

1,41813

1,41535

1,41227

50

1,42417

1,42249

1,41969

1,41659

52

1,42862

1,42692

1,42409

1,42098

54

1,43314

1,43142

1,42857

1,42545

56

1,43774

1,43600

1,43312

1,42999

58

1,44241

1,44065

1,43775

1,43461

60

1,44715

1,44537

1,44245

1,43930

62

1,45197

1,45017

1,44723

1,44407

64

1,45687

1,45504

1,45209

1,44892

66

1,46184

1,46000

1,45702

1,45385

68

1,46690

1,46503

1,46204

1,45886

70

1,47204

1,47015

1,46714

1,46395

72

1,47726

1,47535

1,47232

1,46913

74

1,48256

1,48064

1,47759

1,47439

76

1,48795

1,48601

1,48295

1,47974

78

1,49343

1,49147

1,48839

1,48518

80

1,49899

1,49701

1,49392

1,49071

82

1,50465

1,50265

1,49955

1,49633

84

1,51040

1,50839

1,50527

1,50205
6. Notes
7. Reference International Standard: ISO 1743

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Keywords: laboratory method determination dry matter substance starch glucose maltose fructose syrup refraction refractive index