Determination of total dry extract by the usual calculation method (Type IV)
OIV-MA-BS-10 Determination of total dry extract usual method by calculation
Type IV method
- 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).
- Procedure
Density 20/20, dr, of the "residue without alcohol" is calculated by Tabarie's Formula:
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- 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
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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
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Relative |
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|
density |
Third decimal point of relative density |
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|
to 2 decimal points |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
|
Grams of extract per litre |
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|
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 |