Compendium of International Methods of Analysis for Spirituous Beverages and alcohols

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OIV-MA-BS-10 Determination of total dry extract by the usual calculation method in spirit drinks of viti-vinicultural (Type IV)

Method OIV-MA-BS-10 : R2009

Type IV method

Determination of total dry extract by the usual calculation method in spirit drinks of viti-vinicultural

(OENO 6/94;

OIV/OENO 382A/2009)

1.                Principle

The total dry extract can be calculated indirectly based on the value of the density of the "residue without alcohol" or the alcoholic beverage from which the alcohol has been removed and has been returned to the original volume by adding water. This dry extract is expressed as the amount of sucrose which, dissolved in one litre of solution, has the same density.

This quantity is given by the Plato table (table 1).

2.                Procedure

Density 20/20, dr, of the "residue without alcohol" is calculated by Tabarie's Formula:

  • where ds = density of the alcoholic beverage at 20°C compared with water at 20°C
  • da = density at 20°C of the same hydroalcoholic mixture as the alcoholic beverage, relative to water at 20°C.

dr can also be calculated based on the densities at 20°C ρv of the alcoholic beverage ρa the hydroalcoholic mixture of the same degree by the formula

Record the density dr of the de-alcoholised medium in Table 1 to obtain the weight of total dry extract in grams per litre.

Table 1 for the calculation of solids content

Relative

                   

density

 Third decimal point of relative density

to 2 decimal points

0

1

2

3

4

5

6

7

8

9

 

Grams of extract per litre

1,00

0,0

2,6

5,1

7,7

10,3

12,9

15,4

18,0

20,6

23,2

1,01

25,8

28,4

31,0

33,6

36,2

38,8

41,3

43,9

46,5

49,1

1,02

51,7

54,3

56,9

59,5

62,1

64,7

67,3

69,9

72,5

75,1

1,03

77,7

80,3

82,9

85,5

88,1

90,7

93,3

95,9

98,5

101,1

1,04

103,7

106,3

109,0

111,6

114,2

116,8

119,4

122,0

124,6

127,2

1,05

129,8

132,4

135,0

137,6

140,3

142,9

145,5

148,1

150,7

153,3

1,06

155,9

158,6

161,2

163,8

166,4

169,0

171,6

174,3

176,9

179,5

1,07

182,1

184,8

187,4

190,0

192,6

195,2

197,8

200,5

203,1

205,8

1,08

208,4

211,0

213,6

216,2

218,9

221,5

224,1

226,8

229,4

232,0

1,09

234,7

237,3

239,9

242,5

245,2

247,8

250,4

253,1

255,7

258,4

1,10

261,0

263,6

266,3

268,9

271,5

274,2

276,8

279,5

282,1

284,8

1,11

287,4

290,0

292,7

295,3

298,0

300,6

303,3

305,9

308,6

311,2

1,12

313,9

316,5

319,2

321,8

324,5

327,1

329,8

332,4

335,1

337,8

1,13

340,4

343,0

345,7

348,3

351,0

353,7

356,3

359,0

361,6

364,3

1,14

366,9

369,6

372,3

375,0

377,6

380,3

382,9

385,6

388,3

390,9

1,15

393,6

396,2

398,9

401,6

404,3

406,9

409,6

412,3

415,0

417,6

1,16

420,3

423,0

425,7

428,3

431,0

433,7

436,4

439,0

441,7

444,4

1,17

447,1

449,8

452,4

455,2

457,8

460,5

463,2

465,9

468,6

471,3

1,18

473,9

476,6

479,3

482,0

484,7

487,4

490,1

492,8

495,5

498,2

1,19

500,9

503,5

506,2

508,9

511,6

514,3

517,0

519,7

522,4

525,1

1,20

527,8

-

-

-

-

-

-

-

-

-

Interpolation table

Fourth

decimal point of relative

density

Grams

of extract per litre

Fourth

decimal point of relative

density

Grams

of extract per litre

Fourth

decimal point of relative

density

Grams

of extract per litre

1

0,3

4

1,0

7

1,8

2

0,5

5

1,3

8

2,1

3

0,8

6

1,6

9

2,3