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International Starch Institute
Science Park Aarhus, Denmark
ISI 06 Table 2c - Determination of Dry Matter in Dual Converted 70 DE Syrup by Refractive Index

1. Scope The table is applicable to 70 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

1,33588

1,33480

1,33268

1,33005

4

1,33885

1,33774

1,33559

1,33293

6

1,34186

1,34073

1,33854

1,33587

8

1,34492

1,34377

1,34155

1,33884

10

1,34803

1,34685

1,34459

1,34187

12

1,35119

1,34997

1,34769

1,34494

14

1,35439

1,35315

1,35084

1,34807

16

1,35764

1,35638

1,35403

1,35124

18

1,36094

1,35965

1,35728

1,35446

20

1,36429

1,36297

1,36057

1,35773

22

1,36769

1,36635

1,36391

1,36106

24

1,37114

1,36977

1,36731

1,36444

26

1,37464

1,37325

1,37076

1,36786

28

1,37819

1,37678

1,37426

1,37135

30

1,38180

1,38036

1,37781

1,37488

32

1,38546

1,38399

1,38142

1,37847

34

1,38917

1,38768

1,38508

1,38212

36

1,39294

1,39143

1,38880

1,38582

38

1,39676

1,39523

1,39258

1,38958

40

1,40064

1,39909

1,39641

1,39339

42

1,40458

1,40300

1,40030

1,39727

44

1,40857

1,40697

1,40425

1,40120

46

1,41263

1,41100

1,40825

1,40520

48

1,41674

1,41509

1,41232

1,40925

50

1,42091

1,41924

1,41645

1,41337

52

1,42514

1,42345

1,42064

1,41754

54

1,42944

1,42773

1,42489

1,42179

56

1,43380

1,43207

1,42921

1,42609

58

1,43822

1,43647

1,43359

1,43046

60

1,44271

1,44093

1,43804

1,43490

62

1,44726

1,44547

1,44255

1,43941

64

1,45188

1,45007

1,44713

1,44398

66

1,45656

1,45473

1,45178

1,44862

68

1,46132

1,45947

1,45650

1,45334

70

1,46614

1,46427

1,46129

1,45812

72

1,47104

1,46915

1,46615

1,46298

74

1,47601

1,47410

1,47108

1,46791

76

1,48105

1,47912

1,47609

1,47291

78

1,48616

1,48422

1,48117

1,47799

80

1,49135

1,48939

1,48633

1,48315

82

1,49662

1,49464

1,49157

1,48839

84

1,50196

1,49997

1,49688

1,49370
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