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International Starch Institute
Science Park Aarhus, Denmark
ISI 06 Table 1b - Determination of Dry Matter in Acid Converted 42 DE Syrup by Refractive Index

1. Scope The table is applicable to 42 DE acid 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
Alternative calculation method: Correct index(nD) to index at 45 oC (nD45) if not measured at 45 oC temperature and calculate dry matter (DM) in percent of sample (average results of two samples with no decimal):

nD45 = 0.000065* nD * (45-t) * nD3
DM % = -918.7 + 1108 * nD452 -442 * nD453 - error

DM%

20 oC

30 oC

45 oC

60 oC

error at 45 oC

0

1,33299

1,33194

1,32985

1,32725

1,3

2

1,33590

1,33483

1,33271

1,33008

1,0

4

1,33890

1,33780

1,33564

1,33299

0,8

6

1,34195

1,34081

1,33863

1,33595

0,6

8

1,34504

1,34388

1,34166

1,33896

0,4

10

1,34818

1,34699

1,34474

1,34202

0,2

12

1,35137

1,35016

1,34787

1,34513

0,1

14

1,35461

1,35337

1,35106

1,34828

-0,1

16

1,35790

1,35663

1,35429

1,35149

-0,2

18

1,36124

1,35995

1,35757

1,35476

-0,3

20

1,36463

1,36331

1,36091

1,35807

-0,4

22

1,36807

1,36673

1,36430

1,36144

-0,4

24

1,37157

1,37020

1,36774

1,36486

-0,5

26

1,37512

1,37373

1,37123

1,36834

-0,5

28

1,37872

1,37731

1,37479

1,37187

-0,6

30

1,38238

1,38094

1,37839

1,37546

-0,6

32

1,38610

1,38463

1,38206

1,37910

-0,6

34

1,38987

1,38838

1,38578

1,38281

-0,6

36

1,39370

1,39218

1,38956

1,38657

-0,6

38

1,39758

1,39605

1,39339

1,39039

-0,6

40

1,40153

1,39997

1,39729

1,39427

-0,5

42

1,40554

1,40395

1,40125

1,39822

-0,5

44

1,40960

1,40800

1,40527

1,40222

-0,4

46

1,41373

1,41210

1,40935

1,40629

-0,4

48

1,41792

1,41627

1,41350

1,41042

-0,3

50

1,42218

1,42051

1,41771

1,41462

-0,2

52

1,42650

1,42480

1,42198

1,41888

-0,2

54

1,43088

1,42917

1,42632

1,42321

-0,1

56

1,43533

1,43360

1,43073

1,42761

0,0

58

1,43985

1,43809

1,43521

1,43208

0,0

60

1,44444

1,44266

1,43976

1,43661

0,1

62

1,44910

1,44730

1,44437

1,44122

0,2

64

1,45382

1,45201

1,44906

1,44590

0,3

66

1,45862

1,45679

1,45382

1,45066

0,3

68

1,46350

1,46164

1,45866

1,45549

0,4

70

1,46844

1,46657

1,46357

1,46039

0,4

72

1,47347

1,47157

1,46856

1,46537

0,5

74

1,47857

1,47665

1,47362

1,47044

0,5

76

1,48374

1,48181

1,47877

1,47558

0,5

78

1,48900

1,48705

1,48399

1,48080

0,5

80

1,49434

1,49237

1,48930

1,48610

0,4

82

1,49976

1,49777

1,49469

1,49149

0,4

84

1,50526

1,50326

1,50016

1,49697

0,3
6. Reference  International Standard: ISO 1743

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