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International Starch Institute
Science Park Aarhus, Denmark
ISI 06 Table 3b  - Determination of Dry Matter in Dual Converted 50 DE High Maltose Syrup by Refractive Index

1. Scope The table is applicable to 50 DE dual converted high maltose 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

1,33592

1,33484

1,33272

1,33009

4

1,33894

1,33783

1,33568

1,33302

6

1,34200

1,34087

1,33868

1,33600

8

1,34511

1,34395

1,34173

1,33903

10

1,34827

1,34708

1,34483

1,34211

12

1,35148

1,35027

1,34798

1,34523

14

1,35474

1,35350

1,35118

1,34841

16

1,35805

1,35678

1,35444

1,35164

18

1,36141

1,36012

1,35774

1,35492

20

1,36482

1,36350

1,36110

1,35826

22

1,36828

1,36694

1,36451

1,36165

24

1,37180

1,37044

1,36797

1,36509

26

1,37538

1,37399

1,37149

1,36859

28

1,37901

1,37759

1,37507

1,37215

30

1,38269

1,38125

1,37870

1,37576

32

1,38643

1,38497

1,38239

1,37944

34

1,39023

1,38874

1,38614

1,38317

36

1,39409

1,39257

1,38994

1,38696

38

1,39800

1,39647

1,39381

1,39081

40

1,40198

1,40042

1,39774

1,39472

42

1,40602

1,40444

1,40173

1,39869

44

1,41012

1,40851

1,40578

1,40273

46

1,41428

1,41265

1,40990

1,40683

48

1,41851

1,41686

1,41408

1,41100

50

1,42280

1,42113

1,41832

1,41523

52

1,42716

1,42546

1,42264

1,41953

54

1,43158

1,42986

1,42702

1,42390

56

1,43607

1,43434

1,43147

1,42834

58

1,44064

1,43888

1,43599

1,43285

60

1,44527

1,44349

1,44058

1,43743

62

1,44997

1,44817

1,44524

1,44209

64

1,45475

1,45293

1,44998

1,44682

66

1,45960

1,45776

1,45479

1,45162

68

1,46452

1,46266

1,45968

1,45650

70

1,46953

1,46765

1,46465

1,46146

72

1,47461

1,47271

1,46969

1,46650

74

1,47977

1,47785

1,47481

1,47162

76

1,48501

1,48307

1,48002

1,47682

78

1,49033

1,48837

1,48531

1,48211

80

1,49573

1,49376

1,49068

1,48748

82

1,50122

1,49923

1,49614

1,49294

84

1,50680

1,50479

1,50169

1,49848
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