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International Starch Institute
Science Park Aarhus, Denmark
ISI 06 Table 2b - Determination of Dry Matter in Dual Converted 63 DE Syrup by Refractive Index

1. Scope The table is applicable to 63 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

1,33299

1,33194

1,32985

1,32725

2

1,33589

1,33481

1,33269

1,33006

4

1,33887

1,33777

1,33561

1,33296

6

1,34190

1,34077

1,33858

1,33590

8

1,34498

1,34382

1,34160

1,33890

10

1,34810

1,34691

1,34466

1,34194

12

1,35127

1,35006

1,34777

1,34503

14

1,35449

1,35325

1,35093

1,34816

16

1,35775

1,35649

1,35414

1,35135

18

1,36107

1,35978

1,35740

1,35459

20

1,36444

1,36312

1,36072

1,35788

22

1,36785

1,36651

1,36408

1,36122

24

1,37132

1,36996

1,36749

1,36462

26

1,37484

1,37345

1,37096

1,36807

28

1,37842

1,37700

1,37448

1,37157

30

1,38204

1,38061

1,37806

1,37513

32

1,38573

1,38426

1,38169

1,37874

34

1,38946

1,38798

1,38538

1,38241

36

1,39326

1,39175

1,38912

1,38614

38

1,39711

1,39557

1,39292

1,38992

40

1,40101

1,39946

1,39678

1,39376

42

1,40498

1,40340

1,40070

1,39767

44

1,40900

1,40740

1,40467

1,40163

46

1,41309

1,41146

1,40871

1,40565

48

1,41723

1,41558

1,41281

1,40974

50

1,42144

1,41977

1,41697

1,41389

52

1,42571

1,42402

1,42120

1,41810

54

1,43004

1,42833

1,42549

1,42238

56

1,43444

1,43271

1,42985

1,42673

58

1,43890

1,43715

1,43427

1,43114

60

1,44343

1,44166

1,43876

1,43562

62

1,44803

1,44624

1,44332

1,44017

64

1,45270

1,45088

1,44794

1,44479

66

1,45743

1,45560

1,45264

1,44948

68

1,46224

1,46039

1,45741

1,45425

70

1,46712

1,46525

1,46225

1,45908

72

1,47207

1,47018

1,46717

1,46400

74

1,47710

1,47519

1,47216

1,46898

76

1,48220

1,48027

1,47723

1,47405

78

1,48738

1,48543

1,48238

1,47919

80

1,49263

1,49067

1,48760

1,48442

82

1,49797

1,49599

1,49291

1,48972

84

1,50338

1,50139

1,49830

1,49511
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