Soluble solids in grape juice, reconstituted grape juice, concentrated grape juice, and grape nectar

Status: In force

Soluble solids in grape juice, reconstituted grape juice, concentrated grape juice, and grape nectar

RESOLUTION OIV-OENO 662F-2023

SOLUBLE SOLIDS IN GRAPE JUICE, RECONSTITUTED GRAPE JUICE, CONCENTRATED GRAPE JUICE, AND GRAPE NECTAR

Type I method

THE GENERAL ASSEMBLY,

IN VIEW of Article 2, paragraph iv of the Agreement of 3 April 2001 establishing the International Organisation of Vine and Wine,

AT THE PROPOSAL of the "Methods of Analysis" Sub-Commission,

CONSIDERING that for grape juice, reconstituted grape juice, concentrated grape juice, and grape nectar is proposed the application of the Method OIV-MA-AS2-02 the Compendium of International Methods of Analysis of Wines and Musts,

DECIDES to add the following method:

SOLUBLE SOLIDS IN GRAPE JUICE, RECONSTITUTED GRAPE JUICE, CONCENTRATED GRAPE JUICE, AND GRAPE NECTAR

1.      Scope

This document describes the method used for determining soluble solids in grape juice, reconstituted grape juice, concentrated grape juice, and grape nectar, at the indicated concentrations ranging from 10.0 °Bx to 69.2 °Bx.

2.      Principle

The soluble solids content of a sample is estimated from its refractive index at 20 °C, expressed either as an absolute value or as a percentage by mass of saccharose (degrees Brix), the value is set out on the Table II to obtain the sugar content in grams per litre and in grams per kilogram for grape juice, reconstituted grape juice, concentrated grape juice or grape nectar.

3.      Apparatus

3.1.      Abbe refractometer

The refractometer used must be fitted with a scale giving:

  • either percentage by mass of saccharose to 0.1 %;
  • or refractive indices to four decimal places.

The refractometer must be equipped with a thermometer having a scale extending at least from + 15 °C to + 25 °C and with a system for circulating water that will enable measurements to be made at a temperature of 20 ± 5 °C. The operating instructions for this instrument must be strictly adhered to, particularly with regard to calibration and the light source.

Note:  An electronic refractometer can also be used. In this case, a correction is not necessary for devices that automatically take temperature into account.

3.2.      Analytical balance verified and calibrated with minimum precision of 0.01 g.

4.      Preparation of the sample

Pass the sample through a filter paper or dry gauze folded into four and, after discarding the first drops of the filtrate, carry out the determination on the filtered product.

In the case of concentrated grape juice, depending on its concentration, use the sample directly or prepare a dilution weighing 200 g of concentrated grape juice and adding purified water for laboratories (EN ISO 3696) up to 500 g (F = 2.5).

5.      Procedure

Bring the sample to a temperature close to 20 °C. Place a small test sample on the lower prism of the refractometer, taking care (because the prisms are pressed firmly against each other) that this test sample covers the glass surface uniformly. Carry out the measurement in accordance with the operating instructions of the instrument manufacturer used. Read the percentage by mass of sucrose to within one decimal place or read the refractive index to four decimal places. Carry out at least two determinations on the same prepared sample. Note the temperature in t °C.

6.      Calculation

6.1.      Temperature correction

  • Instruments graduated in percentage by mass of sucrose: use Table I to obtain the temperature correction.

Table I - Correction to be made in the case where the percentage by mass of saccharose was   determined at a temperature different by 20°C.

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It is preferable that the variations in temperature in relation to 20 °C do not exceed  5 °C.

  • Instruments graduated in refractive index: find the refractive index measured (2nd column) in Table II to obtain the corresponding value of the percentage by mass of sucrose (1st column). This value is corrected for temperature and expressed as a concentration at 20°C by means of Table I.

TABLE II - Table giving the sugar content of musts and concentrated musts in    grammes per litre and in grammes per kilogramme, determined using a graduated refractometer, either in percentage by mass of saccharose at 20 °C or refractive index at 20 °C. The mass density at 20 °C is also given.

Saccharose

(%(m/m)

Refractive Index at 20 °C

Mass Density at 20 °C

Sugars  (g/L)

Sugars  (g/kg)

ABV (% v/v) at 20 °C

10.0

1.34782

1.0391

82.2

79.1

4.89

10.1

1.34798

1.0395

83.3

80.1

4.95

10.2

1.34813

1.0399

84.3

81.1

5.01

10.3

1.34829

1.0403

85.4

82.1

5.08

10.4

1.34844

1.0407

86.5

83.1

5.14

10.5

1.34860

1.0411

87.5

84.1

5.20

10.6

1.34875

1.0415

88.6

85.0

5.27

10.7

1.34891

1.0419

89.6

86.0

5.32

10.8

1.34906

1.0423

90.7

87.0

5.39

10.9

1.34922

1.0427

91.8

88.0

5.46

11.0

1.34937

1.0431

92.8

89.0

5.52

11.1

1.34953

1.0436

93.9

90.0

5.58

11.2

1.34968

1.0440

95.0

91.0

5.65

11.3

1.34984

1.0444

96.0

92.0

5.71

11.4

1.34999

1.0448

97.1

92.9

5.77

11.5

1.35015

1.0452

98.2

93.9

5.84

11.6

1.35031

1.0456

99.3

94.9

5.90

11.7

1.35046

1.0460

100.3

95.9

5.96

11.8

1.35062

1.0464

101.4

96.9

6.03

11.9

1.35077

1.0468

102.5

97.9

6.09

12.0

1.35093

1.0472

103.5

98.9

6.15

12.1

1.35109

1.0477

104.6

99.9

6.22

12.2

1.35124

1.0481

105.7

100.8

6.28

12.3

1.35140

1.0485

106.8

101.8

6.35

12.4

1.35156

1.0489

107.8

102.8

6.41

12.5

1.35171

1.0493

108.9

103.8

6.47

12.6

1.35187

1.0497

110.0

104.8

6.54

12.7

1.35203

1.0501

111.1

105.8

6.60

12.8

1.35219

1.0506

112.2

106.8

6.67

12.9

1.35234

1.0510

113.2

107.8

6.73

13.0

1.35250

1.0514

114.3

108.7

6.79

13.1

1.35266

1.0518

115.4

109.7

6.86

13.2

1.35282

1.0522

116.5

110.7

6.92

13.3

1.35298

1.0527

117.6

111.7

6.99

13.4

1.35313

1.0531

118.7

112.7

7.05

13.5

1.35329

1.0535

119.7

113.7

7.11

13.6

1.35345

1.0539

120.8

114.7

7.18

13.7

1.35361

1.0543

121.9

115.6

7.24

13.8

1.35377

1.0548

123.0

116.6

7.31

13.9

1.35393

1.0552

124.1

117.6

7.38

14.0

1.35408

1.0556

125.2

118.6

7.44

14.1

1.35424

1.0560

126.3

119.6

7.51

14.2

1.35440

1.0564

127.4

120.6

7.57

14.3

1.35456

1.0569

128.5

121.6

7.64

14.4

1.35472

1.0573

129.6

122.5

7.70

14.5

1.35488

1.0577

130.6

123.5

7.76

14.6

1.35504

1.0581

131.7

124.5

7.83

14.7

1.35520

1.0586

132.8

125.5

7.89

14.8

1.35536

1.0590

133.9

126.5

7.96

14.9

1.35552

1.0594

135.0

127.5

8.02

15.0

1.35568

1.0598

136.1

128.4

8.09

15.1

1.35584

1.0603

137.2

129.4

8.15

15.2

1.35600

1.0607

138.3

130.4

8.22

15.3

1.35616

1.0611

139.4

131.4

8.28

15.4

1.35632

1.0616

140.5

132.4

8.35

15.5

1.35648

1.0620

141.6

133.4

8.42

15.6

1.35664

1.0624

142.7

134.3

8.48

15.7

1.35680

1.0628

143.8

135.3

8.55

15.8

1.35696

1.0633

144.9

136.3

8.61

15.9

1.35713

1.0637

146.0

137.3

8.68

16.0

1.35729

1.0641

147.1

138.3

8.74

16.1

1.35745

1.0646

148.2

139.3

8.81

16.2

1.35761

1.0650

149.3

140.2

8.87

16.3

1.35777

1.0654

150.5

141.2

8.94

16.4

1.35793

1.0659

151.6

142.2

9.01

16.5

1.35810

1.0663

152.7

143.2

9.07

16.6

1.35826

1.0667

153.8

144.2

9.14

16.7

1.35842

1.0672

154.9

145.1

9.21

16.8

1.35858

1.0676

156.0

146.1

9.27

16.9

1.35874

1.0680

157.1

147.1

9.34

17.0

1.35891

1.0685

158.2

148.1

9.40

17.1

1.35907

1.0689

159.3

149.1

9.47

17.2

1.35923

1.0693

160.4

150.0

9.53

17.3

1.35940

1.0698

161.6

151.0

9.60

17.4

1.35956

1.0702

162.7

152.0

9.67

17.5

1.35972

1.0707

163.8

153.0

9.73

17.6

1.35989

1.0711

164.9

154.0

9.80

17.7

1.36005

1.0715

166.0

154.9

9.87

17.8

1.36021

1.0720

167.1

155.9

9.93

17.9

1.36038

1.0724

168.3

156.9

10.00

18.0

1.36054

1.0729

169.4

157.9

10.07

18.1

1.36070

1.0733

170.5

158.9

10.13

18.2

1.36087

1.0737

171.6

159.8

10.20

18.3

1.36103

1.0742

172.7

160.8

10.26

18.4

1.36120

1.0746

173.9

161.8

10.33

18.5

1.36136

1.0751

175.0

162.8

10.40

18.6

1.36153

1.0755

176.1

163.7

10.47

18.7

1.36169

1.0760

177.2

164.7

10.53

18.8

1.36185

1.0764

178.4

165.7

10.60

18.9

1.36202

1.0768

179.5

166.7

10.67

19.0

1.36219

1.0773

180.6

167.6

10.73

19.1

1.36235

1.0777

181.7

168.6

10.80

19.2

1.36252

1.0782

182.9

169.6

10.87

19.3

1.36268

1.0786

184.0

170.6

10.94

19.4

1.36285

1.0791

185.1

171.5

11.00

19.5

1.36301

1.0795

186.2

172.5

11.07

19.6

1.36318

1.0800

187.4

173.5

11.14

19.7

1.36334

1.0804

188.5

174.5

11.20

19.8

1.36351

1.0809

189.6

175.4

11.27

19.9

1.36368

1.0813

190.8

176.4

11.34

20.0

1.36384

1.0818

191.9

177.4

11.40

20.1

1.36401

1.0822

193.0

178.4

11.47

20.2

1.36418

1.0827

194.2

179.3

11.54

20.3

1.36434

1.0831

195.3

180.3

11.61

20.4

1.36451

1.0836

196.4

181.3

11.67

20.5

1.36468

1.0840

197.6

182.3

11.74

20.6

1.36484

1.0845

198.7

183.2

11.81

20.7

1.36501

1.0849

199.8

184.2

11.87

20.8

1.36518

1.0854

201.0

185.2

11.95

20.9

1.36535

1.0858

202.1

186.1

12.01

21.0

1.36551

1.0863

203.3

187.1

12.08

21.1

1.36568

1.0867

204.4

188.1

12.15

21.2

1.36585

1.0872

205.5

189.1

12.21

21.3

1.36602

1.0876

206.7

190.0

12.28

21.4

1.36619

1.0881

207.8

191.0

12.35

21.5

1.36635

1.0885

209.0

192.0

12.42

21.6

1.36652

1.0890

210.1

192.9

12.49

21.7

1.36669

1.0895

211.3

193.9

12.56

21.8

1.36686

1.0899

212.4

194.9

12.62

21.9

1.36703

1.0904

213.6

195.9

12.69

22.0

1.36720

1.0908

214.7

196.8

12.76

22.1

1.36737

1.0913

215.9

197.8

12.83

22.2

1.36754

1.0917

217.0

198.8

12.90

22.3

1.36771

1.0922

218.2

199.7

12.97

22.4

1.36787

1.0927

219.3

200.7

13.03

22.5

1.36804

1.0931

220.5

201.7

13.10

22.6

1.36821

1.0936

221.6

202.6

13.17

22.7

1.36838

1.0940

222.8

203.6

13.24

22.8

1.36855

1.0945

223.9

204.6

13.31

22.9

1.36872

1.0950

225.1

205.5

13.38

23.0

1.36889

1.0954

226.2

206.5

13.44

23.1

1.36906

1.0959

227.4

207.5

13.51

23.2

1.36924

1.0964

228.5

208.4

13.58

23.3

1.36941

1.0968

229.7

209.4

13.65

23.4

1.36958

1.0973

230.8

210.4

13.72

23.5

1.36975

1.0977

232.0

211.3

13.79

23.6

1.36992

1.0982

233.2

212.3

13.86

23.7

1.37009

1.0987

234.3

213.3

13.92

23.8

1.37026

1.0991

235.5

214.2

14.00

23.9

1.37043

1.0996

236.6

215.2

14.06

24.0

1.37060

1.1001

237.8

216.2

14.13

24.1

1.37078

1.1005

239.0

217.1

14.20

24.2

1.37095

1.1010

240.1

218.1

14.27

24.3

1.37112

1.1015

241.3

219.1

14.34

24.4

1.37129

1.1019

242.5

220.0

14.41

24.5

1.37146

1.1024

243.6

221.0

14.48

24.6

1.37164

1.1029

244.8

222.0

14.55

24.7

1.37181

1.1033

246.0

222.9

14.62

24.8

1.37198

1.1038

247.1

223.9

14.69

24.9

1.37216

1.1043

248.3

224.8

14.76

25.0

1.37233

1.1047

249.5

225.8

14.83

25.1

1.37250

1.1052

250.6

226.8

14.89

25.2

1.37267

1.1057

251.8

227.7

14.96

25.3

1.37285

1.1062

253.0

228.7

15.04

25.4

1.37302

1.1066

254.1

229.7

15.10

25.5

1.37319

1.1071

255.3

230.6

15.17

25.6

1.37337

1.1076

256.5

231.6

15.24

25.7

1.37354

1.1080

257.7

232.5

15.32

25.8

1.37372

1.1085

258.8

233.5

15.38

25.9

1.37389

1.1090

260.0

234.5

15.45

26.0

1.37407

1.1095

261.2

235.4

15.52

26.1

1.37424

1.1099

262.4

236.4

15.59

26.2

1.37441

1.1104

263.6

237.3

15.67

26.3

1.37459

1.1109

264.7

238.3

15.73

26.4

1.37476

1.1114

265.9

239.3

15.80

26.5

1.37494

1.1118

267.1

240.2

15.87

26.6

1.37511

1.1123

268.3

241.2

15.95

26.7

1.37529

1.1128

269.5

242.1

16.02

26.8

1.37546

1.1133

270.6

243.1

16.08

26.9

1.37564

1.1138

271.8

244.1

16.15

27.0

1.37582

1.1142

273.0

245.0

16.22

27.1

1.37599

1.1147

274.2

246.0

16.30

27.2

1.37617

1.1152

275.4

246.9

16.37

27.3

1.37634

1.1157

276.6

247.9

16.44

27.4

1.37652

1.1161

277.8

248.9

16.51

27.5

1.37670

1.1166

278.9

249.8

16.58

27.6

1.37687

1.1171

280.1

250.8

16.65

27.7

1.37705

1.1176

281.3

251.7

16.72

27.8

1.37723

1.1181

282.5

252.7

16.79

27.9

1.37740

1.1185

283.7

253.6

16.86

28.0

1.37758

1.1190

284.9

254.6

16.93

28.1

1.37776

1.1195

286.1

255.5

17.00

28.2

1.37793

1.1200

287.3

256.5

17.07

28.3

1.37811

1.1205

288.5

257.5

17.15

28.4

1.37829

1.1210

289.7

258.4

17.22

28.5

1.37847

1.1214

290.9

259.4

17.29

28.6

1.37864

1.1219

292.1

260.3

17.36

28.7

1.37882

1.1224

293.3

261.3

17.43

28.8

1.37900

1.1229

294.5

262.2

17.50

28.9

1.37918

1.1234

295.7

263.2

17.57

29.0

1.37936

1.1239

296.9

264.2

17.64

29.1

1.37954

1.1244

298.1

265.1

17.72

29.2

1.37972

1.1248

299.3

266.1

17.79

29.3

1.37989

1.1253

300.5

267.0

17.86

29.4

1.38007

1.1258

301.7

268.0

17.93

29.5

1.38025

1.1263

302.9

268.9

18.00

29.6

1.38043

1.1268

304.1

269.9

18.07

29.7

1.38061

1.1273

305.3

270.8

18.14

29.8

1.38079

1.1278

306.5

271.8

18.22

29.9

1.38097

1.1283

307.7

272.7

18.29

30.0

1.38115

1.1287

308.9

273.7

18.36

30.1

1.38133

1.1292

310.1

274.6

18.43

30.2

1.38151

1.1297

311.3

275.6

18.50

30.3

1.38169

1.1302

312.6

276.5

18.58

30.4

1.38187

1.1307

313.8

277.5

18.65

30.5

1.38205

1.1312

315.0

278.5

18.72

30.6

1.38223

1.1317

316.2

279.4

18.79

30.7

1.38241

1.1322

317.4

280.4

18.86

30.8

1.38259

1.1327

318.6

281.3

18.93

30.9

1.38277

1.1332

319.8

282.3

19.01

31.0

1.38296

1.1337

321.1

283.2

19.08

31.1

1.38314

1.1342

322.3

284.2

19.15

31.2

1.38332

1.1346

323.5

285.1

19.23

31.3

1.38350

1.1351

324.7

286.1

19.30

31.4

1.38368

1.1356

325.9

287.0

19.37

31.5

1.38386

1.1361

327.2

288.0

19.45

31.6

1.38405

1.1366

328.4

288.9

19.52

31.7

1.38423

1.1371

329.6

289.9

19.59

31.8

1.38441

1.1376

330.8

290.8

19.66

31.9

1.38459

1.1381

332.1

291.8

19.74

32.0

1.38478

1.1386

333.3

292.7

19.81

32.1

1.38496

1.1391

334.5

293.7

19.88

32.2

1.38514

1.1396

335.7

294.6

19.95

32.3

1.38532

1.1401

337.0

295.6

20.03

32.4

1.38551

1.1406

338.2

296.5

20.10

32.5

1.38569

1.1411

339.4

297.5

20.17

32.6

1.38587

1.1416

340.7

298.4

20.25

32.7

1.38606

1.1421

341.9

299.4

20.32

32.8

1.38624

1.1426

343.1

300.3

20.39

32.9

1.38643

1.1431

344.4

301.3

20.47

33.0

1.38661

1.1436

345.6

302.2

20.54

33.1

1.38679

1.1441

346.8

303.2

20.61

33.2

1.38698

1.1446

348.1

304.1

20.69

33.3

1.38716

1.1451

349.3

305.0

20.76

33.4

1.38735

1.1456

350.6

306.0

20.84

33.5

1.38753

1.1461

351.8

306.9

20.91

33.6

1.38772

1.1466

353.0

307.9

20.98

33.7

1.38790

1.1471

354.3

308.8

21.06

33.8

1.38809

1.1476

355.5

309.8

21.13

33.9

1.38827

1.1481

356.8

310.7

21.20

34.0

1.38846

1.1486

358.0

311.7

21.28

34.1

1.38864

1.1491

359.2

312.6

21.35

34.2

1.38883

1.1496

360.5

313.6

21.42

34.3

1.38902

1.1501

361.7

314.5

21.50

34.4

1.38920

1.1507

363.0

315.5

21.57

34.5

1.38939

1.1512

364.2

316.4

21.64

34.6

1.38958

1.1517

365.5

317.4

21.72

34.7

1.38976

1.1522

366.7

318.3

21.79

34.8

1.38995

1.1527

368.0

319.2

21.87

34.9

1.39014

1.1532

369.2

320.2

21.94

35.0

1.39032

1.1537

370.5

321.1

22.02

35.1

1.39051

1.1542

371.8

322.1

22.10

35.2

1.39070

1.1547

373.0

323.0

22.17

35.3

1.39088

1.1552

374.3

324.0

22.24

35.4

1.39107

1.1557

375.5

324.9

22.32

35.5

1.39126

1.1563

376.8

325.9

22.39

35.6

1.39145

1.1568

378.0

326.8

22.46

35.7

1.39164

1.1573

379.3

327.8

22.54

35.8

1.39182

1.1578

380.6

328.7

22.62

35.9

1.39201

1.1583

381.8

329.6

22.69

36.0

1.39220

1.1588

383.1

330.6

22.77

36.1

1.39239

1.1593

384.4

331.5

22.84

36.2

1.39258

1.1598

385.6

332.5

22.92

36.3

1.39277

1.1603

386.9

333.4

22.99

36.4

1.39296

1.1609

388.1

334.4

23.06

36.5

1.39314

1.1614

389.4

335.3

23.14

36.6

1.39333

1.1619

390.7

336.3

23.22

36.7

1.39352

1.1624

392.0

337.2

23.30

36.8

1.39371

1.1629

393.2

338.1

23.37

36.9

1.39390

1.1634

394.5

339.1

23.45

37.0

1.39409

1.1640

395.8

340.0

23.52

37.1

1.39428

1.1645

397.0

341.0

23.59

37.2

1.39447

1.1650

398.3

341.9

23.67

37.3

1.39466

1.1655

399.6

342.9

23.75

37.4

1.39485

1.1660

400.9

343.8

23.83

37.5

1.39504

1.1665

402.1

344.7

23.90

37.6

1.39524

1.1671

403.4

345.7

23.97

37.7

1.39543

1.1676

404.7

346.6

24.05

37.8

1.39562

1.1681

406.0

347.6

24.13

37.9

1.39581

1.1686

407.3

348.5

24.21

38.0

1.39600

1.1691

408.6

349.4

24.28

38.1

1.39619

1.1697

409.8

350.4

24.35

38.2

1.39638

1.1702

411.1

351.3

24.43

38.3

1.39658

1.1707

412.4

352.3

24.51

38.4

1.39677

1.1712

413.7

353.2

24.59

38.5

1.39696

1.1717

415.0

354.2

24.66

38.6

1.39715

1.1723

416.3

355.1

24.74

38.7

1.39734

1.1728

417.6

356.0

24.82

38.8

1.39754

1.1733

418.8

357.0

24.89

38.9

1.39773

1.1738

420.1

357.9

24.97

39.0

1.39792

1.1744

421.4

358.9

25.04

39.1

1.39812

1.1749

422.7

359.8

25.12

39.2

1.39831

1.1754

424.0

360.7

25.20

39.3

1.39850

1.1759

425.3

361.7

25.28

39.4

1.39870

1.1765

426.6

362.6

25.35

39.5

1.39889

1.1770

427.9

363.6

25.43

39.6

1.39908

1.1775

429.2

364.5

25.51

39.7

1.39928

1.1780

430.5

365.4

25.58

39.8

1.39947

1.1786

431.8

366.4

25.66

39.9

1.39967

1.1791

433.1

367.3

25.74

40.0

1.39986

1.1796

434.4

368.3

25.82

40.1

1.40006

1.1801

435.7

369.2

25.89

40.2

1.40025

1.1807

437.0

370.1

25.97

40.3

1.40044

1.1812

438.3

371.1

26.05

40.4

1.40064

1.1817

439.6

372.0

26.13

40.5

1.40083

1.1823

440.9

373.0

26.20

40.6

1.40103

1.1828

442.2

373.9

26.28

40.7

1.40123

1.1833

443.6

374.8

26.36

40.8

1.40142

1.1839

444.9

375.8

26.44

40.9

1.40162

1.1844

446.2

376.7

26.52

41.0

1.40181

1.1849

447.5

377.7

26.59

41.1

1.40201

1.1855

448.8

378.6

26.67

41.2

1.40221

1.1860

450.1

379.5

26.75

41.3

1.40240

1.1865

451.4

380.5

26.83

41.4

1.40260

1.1871

452.8

381.4

26.91

41.5

1.40280

1.1876

454.1

382.3

26.99

41.6

1.40299

1.1881

455.4

383.3

27.06

41.7

1.40319

1.1887

456.7

384.2

27.14

41.8

1.40339

1.1892

458.0

385.2

27.22

41.9

1.40358

1.1897

459.4

386.1

27.30

42.0

1.40378

1.1903

460.7

387.0

27.38

42.1

1.40398

1.1908

462.0

388.0

27.46

42.2

1.40418

1.1913

463.3

388.9

27.53

42.3

1.40437

1.1919

464.7

389.9

27.62

42.4

1.40457

1.1924

466.0

390.8

27.69

42.5

1.40477

1.1929

467.3

391.7

27.77

42.6

1.40497

1.1935

468.6

392.7

27.85

42.7

1.40517

1.1940

470.0

393.6

27.93

42.8

1.40537

1.1946

471.3

394.5

28.01

42.9

1.40557

1.1951

472.6

395.5

28.09

43.0

1.40576

1.1956

474.0

396.4

28.17

43.1

1.40596

1.1962

475.3

397.3

28.25

43.2

1.40616

1.1967

476.6

398.3

28.32

43.3

1.40636

1.1973

478.0

399.2

28.41

43.4

1.40656

1.1978

479.3

400.2

28.48

43.5

1.40676

1.1983

480.7

401.1

28.57

43.6

1.40696

1.1989

482.0

402.0

28.65

43.7

1.40716

1.1994

483.3

403.0

28.72

43.8

1.40736

1.2000

484.7

403.9

28.81

43.9

1.40756

1.2005

486.0

404.8

28.88

44.0

1.40776

1.2011

487.4

405.8

28.97

44.1

1.40796

1.2016

488.7

406.7

29.04

44.2

1.40817

1.2022

490.1

407.6

29.13

44.3

1.40837

1.2027

491.4

408.6

29.20

44.4

1.40857

1.2032

492.8

409.5

29.29

44.5

1.40877

1.2038

494.1

410.4

29.36

44.6

1.40897

1.2043

495.5

411.4

29.45

44.7

1.40917

1.2049

496.8

412.3

29.52

44.8

1.40937

1.2054

498.2

413.3

29.61

44.9

1.40958

1.2060

499.5

414.2

29.69

45.0

1.40978

1.2065

500.9

415.1

29.77

45.1

1.40998

1.2071

502.2

416.1

29.85

45.2

1.41018

1.2076

503.6

417.0

29.93

45.3

1.41039

1.2082

504.9

417.9

30.01

45.4

1.41059

1.2087

506.3

418.9

30.09

45.5

1.41079

1.2093

507.7

419.8

30.17

45.6

1.41099

1.2098

509.0

420.7

30.25

45.7

1.41120

1.2104

510.4

421.7

30.33

45.8

1.41140

1.2109

511.7

422.6

30.41

45.9

1.41160

1.2115

513.1

423.5

30.49

46.0

1.41181

1.2120

514.5

424.5

30.58

46.1

1.41201

1.2126

515.8

425.4

30.65

46.2

1.41222

1.2131

517.2

426.3

30.74

46.3

1.41242

1.2137

518.6

427.3

30.82

46.4

1.41262

1.2142

519.9

428.2

30.90

46.5

1.41283

1.2148

521.3

429.1

30.98

46.6

1.41303

1.2154

522.7

430.1

31.06

46.7

1.41324

1.2159

524.1

431.0

31.15

46.8

1.41344

1.2165

525.4

431.9

31.22

46.9

1.41365

1.2170

526.8

432.9

31.31

47.0

1.41385

1.2176

528.2

433.8

31.39

47.1

1.41406

1.2181

529.6

434.7

31.47

47.2

1.41427

1.2187

530.9

435.7

31.55

47.3

1.41447

1.2192

532.3

436.6

31.63

47.4

1.41468

1.2198

533.7

437.5

31.72

47.5

1.41488

1.2204

535.1

438.5

31.80

47.6

1.41509

1.2209

536.5

439.4

31.88

47.7

1.41530

1.2215

537.9

440.3

31.97

47.8

1.41550

1.2220

539.2

441.3

32.04

47.9

1.41571

1.2226

540.6

442.2

32.13

48.0

1.41592

1.2232

542.0

443.1

32.21

48.1

1.41612

1.2237

543.4

444.1

32.29

48.2

1.41633

1.2243

544.8

445.0

32.38

48.3

1.41654

1.2248

546.2

445.9

32.46

48.4

1.41674

1.2254

547.6

446.8

32.54

48.5

1.41695

1.2260

549.0

447.8

32.63

48.6

1.41716

1.2265

550.4

448.7

32.71

48.7

1.41737

1.2271

551.8

449.6

32.79

48.8

1.41758

1.2277

553.2

450.6

32.88

48.9

1.41779

1.2282

554.6

451.5

32.96

49.0

1.41799

1.2288

556.0

452.4

33.04

49.1

1.41820

1.2294

557.4

453.4

33.13

49.2

1.41841

1.2299

558.8

454.3

33.21

49.3

1.41862

1.2305

560.2

455.2

33.29

49.4

1.41883

1.2311

561.6

456.2

33.38

49.5

1.41904

1.2316

563.0

457.1

33.46

49.6

1.41925

1.2322

564.4

458.0

33.54

49.7

1.41946

1.2328

565.8

458.9

33.63

49.8

1.41967

1.2333

567.2

459.9

33.71

49.9

1.41988

1.2339

568.6

460.8

33.79

50.0

1.42009

1.2345

570.0

461.7

33.88

50.1

1.42030

1.2350

571.4

462.7

33.96

50.2

1.42051

1.2356

572.8

463.6

34.04

50.3

1.42072

1.2362

574.2

464.5

34.12

50.4

1.42093

1.2368

575.6

465.4

34.21

50.5

1.42114

1.2373

577.1

466.4

34.30

50.6

1.42135

1.2379

578.5

467.3

34.38

50.7

1.42156

1.2385

579.9

468.2

34.46

50.8

1.42177

1.2390

581.3

469.2

34.55

50.9

1.42199

1.2396

582.7

470.1

34.63

51.0

1.42220

1.2402

584.2

471.0

34.72

51.1

1.42241

1.2408

585.6

471.9

34.80

51.2

1.42262

1.2413

587.0

472.9

34.89

51.3

1.42283

1.2419

588.4

473.8

34.97

51.4

1.42305

1.2425

589.9

474.7

35.06

51.5

1.42326

1.2431

591.3

475.7

35.14

51.6

1.42347

1.2436

592.7

476.6

35.22

51.7

1.42368

1.2442

594.1

477.5

35.31

51.8

1.42390

1.2448

595.6

478.4

35.40

51.9

1.42411

1.2454

597.0

479.4

35.48

52.0

1.42432

1.2460

598.4

480.3

35.56

52.1

1.42454

1.2465

599.9

481.2

35.65

52.2

1.42475

1.2471

601.3

482.1

35.74

52.3

1.42496

1.2477

602.7

483.1

35.82

52.4

1.42518

1.2483

604.2

484.0

35.91

52.5

1.42539

1.2488

605.6

484.9

35.99

52.6

1.42561

1.2494

607.0

485.8

36.07

52.7

1.42582

1.2500

608.5

486.8

36.16

52.8

1.42604

1.2506

609.9

487.7

36.25

52.9

1.42625

1.2512

611.4

488.6

36.34

53.0

1.42647

1.2518

612.8

489.5

36.42

53.1

1.42668

1.2523

614.2

490.5

36.50

53.2

1.42690

1.2529

615.7

491.4

36.59

53.3

1.42711

1.2535

617.1

492.3

36.67

53.4

1.42733

1.2541

618.6

493.2

36.76

53.5

1.42754

1.2547

620.0

494.2

36.85

53.6

1.42776

1.2553

621.5

495.1

36.94

53.7

1.42798

1.2558

622.9

496.0

37.02

53.8

1.42819

1.2564

624.4

496.9

37.11

53.9

1.42841

1.2570

625.8

497.9

37.19

54.0

1.42863

1.2576

627.3

498.8

37.28

54.1

1.42884

1.2582

628.7

499.7

37.36

54.2

1.42906

1.2588

630.2

500.6

37.45

54.3

1.42928

1.2594

631.7

501.6

37.54

54.4

1.42949

1.2600

633.1

502.5

37.63

54.5

1.42971

1.2606

634.6

503.4

37.71

54.6

1.42993

1.2611

636.0

504.3

37.80

54.7

1.43015

1.2617

637.5

505.2

37.89

54.8

1.43036

1.2623

639.0

506.2

37.98

54.9

1.43058

1.2629

640.4

507.1

38.06

55.0

1.43080

1.2635

641.9

508.0

38.15

55.1

1.43102

1.2641

643.4

508.9

38.24

55.2

1.43124

1.2647

644.8

509.9

38.32

55.3

1.43146

1.2653

646.3

510.8

38.41

55.4

1.43168

1.2659

647.8

511.7

38.50

55.5

1.43189

1.2665

649.2

512.6

38.58

55.6

1.43211

1.2671

650.7

513.5

38.67

55.7

1.43233

1.2677

652.2

514.5

38.76

55.8

1.43255

1.2683

653.7

515.4

38.85

55.9

1.43277

1.2689

655.1

516.3

38.93

56.0

1.43299

1.2695

656.6

517.2

39.02

56.1

1.43321

1.2701

658.1

518.1

39.11

56.2

1.43343

1.2706

659.6

519.1

39.20

56.3

1.43365

1.2712

661.0

520.0

39.28

56.4

1.43387

1.2718

662.5

520.9

39.37

56.5

1.43410

1.2724

664.0

521.8

39.46

56.6

1.43432

1.2730

665.5

522.7

39.55

56.7

1.43454

1.2736

667.0

523.7

39.64

56.8

1.43476

1.2742

668.5

524.6

39.73

56.9

1.43498

1.2748

669.9

525.5

39.81

57.0

1.43520

1.2754

671.4

526.4

39.90

57.1

1.43542

1.2760

672.9

527.3

39.99

57.2

1.43565

1.2766

674.4

528.3

40.08

57.3

1.43587

1.2773

675.9

529.2

40.17

57.4

1.43609

1.2779

677.4

530.1

40.26

57.5

1.43631

1.2785

678.9

531.0

40.35

57.6

1.43653

1.2791

680.4

531.9

40.44

57.7

1.43676

1.2797

681.9

532.8

40.53

57.8

1.43698

1.2803

683.4

533.8

40.61

57.9

1.43720

1.2809

684.9

534.7

40.70

58.0

1.43743

1.2815

686.4

535.6

40.79

58.1

1.43765

1.2821

687.9

536.5

40.88

58.2

1.43787

1.2827

689.4

537.4

40.97

58.3

1.43810

1.2833

690.9

538.3

41.06

58.4

1.43832

1.2839

692.4

539.3

41.15

58.5

1.43855

1.2845

693.9

540.2

41.24

58.6

1.43877

1.2851

695.4

541.1

41.33

58.7

1.43899

1.2857

696.9

542.0

41.42

58.8

1.43922

1.2863

698.4

542.9

41.51

58.9

1.43944

1.2870

699.9

543.8

41.60

59.0

1.43967

1.2876

701.4

544.8

41.68

59.1

1.43989

1.2882

702.9

545.7

41.77

59.2

1.44012

1.2888

704.4

546.6

41.86

59.3

1.44035

1.2894

706.0

547.5

41.96

59.4

1.44057

1.2900

707.5

548.4

42.05

59.5

1.44080

1.2906

709.0

549.3

42.14

59.6

1.44102

1.2912

710.5

550.2

42.23

59.7

1.44125

1.2919

712.0

551.1

42.31

59.8

1.44148

1.2925

713.5

552.1

42.40

59.9

1.44170

1.2931

715.1

553.0

42.50

60.0

1.44193

1.2937

716.6

553.9

42.59

60.1

1.44216

1.2943

718.1

554.8

42.68

60.2

1.44238

1.2949

719.6

555.7

42.77

60.3

1.44261

1.2956

721.1

556.6

42.85

60.4

1.44284

1.2962

722.7

557.5

42.95

60.5

1.44306

1.2968

724.2

558.4

43.04

60.6

1.44329

1.2974

725.7

559.4

43.13

60.7

1.44352

1.2980

727.3

560.3

43.22

60.8

1.44375

1.2986

728.8

561.2

43.31

60.9

1.44398

1.2993

730.3

562.1

43.40

61.0

1.44420

1.2999

731.8

563.0

43.49

61.1

1.44443

1.3005

733.4

563.9

43.59

61.2

1.44466

1.3011

734.9

564.8

43.68

61.3

1.44489

1.3017

736.4

565.7

43.76

61.4

1.44512

1.3024

738.0

566.6

43.86

61.5

1.44535

1.3030

739.5

567.6

43.95

61.6

1.44558

1.3036

741.1

568.5

44.04

61.7

1.44581

1.3042

742.6

569.4

44.13

61.8

1.44604

1.3049

744.1

570.3

44.22

61.9

1.44627

1.3055

745.7

571.2

44.32

62.0

1.44650

1.3061

747.2

572.1

44.41

62.1

1.44673

1.3067

748.8

573.0

44.50

62.2

1.44696

1.3074

750.3

573.9

44.59

62.3

1.44719

1.3080

751.9

574.8

44.69

62.4

1.44742

1.3086

753.4

575.7

44.77

62.5

1.44765

1.3092

755.0

576.6

44.87

62.6

1.44788

1.3099

756.5

577.5

44.96

62.7

1.44811

1.3105

758.1

578.5

45.05

62.8

1.44834

1.3111

759.6

579.4

45.14

62.9

1.44858

1.3118

761.2

580.3

45.24

63.0

1.44881

1.3124

762.7

581.2

45.33

63.1

1.44904

1.3130

764.3

582.1

45.42

63.2

1.44927

1.3137

765.8

583.0

45.51

63.3

1.44950

1.3143

767.4

583.9

45.61

63.4

1.44974

1.3149

769.0

584.8

45.70

63.5

1.44997

1.3155

770.5

585.7

45.79

63.6

1.45020

1.3162

772.1

586.6

45.89

63.7

1.45043

1.3168

773.6

587.5

45.98

63.8

1.45067

1.3174

775.2

588.4

46.07

63.9

1.45090

1.3181

776.8

589.3

46.17

64.0

1.45113

1.3187

778.3

590.2

46.25

64.1

1.45137

1.3193

779.9

591.1

46.35

64.2

1.45160

1.3200

781.5

592.0

46.44

64.3

1.45184

1.3206

783.0

592.9

46.53

64.4

1.45207

1.3213

784.6

593.8

46.63

64.5

1.45230

1.3219

786.2

594.7

46.72

64.6

1.45254

1.3225

787.8

595.6

46.82

64.7

1.45277

1.3232

789.3

596.5

46.91

64.8

1.45301

1.3238

790.9

597.4

47.00

64.9

1.45324

1.3244

792.5

598.3

47.10

65.0

1.45348

1.3251

794.1

599.3

47.19

65.1

1.45371

1.3257

795.6

600.2

47.28

65.2

1.45395

1.3264

797.2

601.1

47.38

65.3

1.45418

1.3270

798.8

602.0

47.47

65.4

1.45442

1.3276

800.4

602.9

47.57

65.5

1.45466

1.3283

802.0

603.8

47.66

65.6

1.45489

1.3289

803.6

604.7

47.76

65.7

1.45513

1.3296

805.1

605.6

47.85

65.8

1.45537

1.3302

806.7

606.5

47.94

65.9

1.45560

1.3309

808.3

607.4

48.04

66.0

1.45584

1.3315

809.9

608.3

48.13

66.1

1.45608

1.3322

811.5

609.2

48.23

66.2

1.45631

1.3328

813.1

610.1

48.32

66.3

1.45655

1.3334

814.7

611.0

48.42

66.4

1.45679

1.3341

816.3

611.9

48.51

66.5

1.45703

1.3347

817.9

612.8

48.61

66.6

1.45726

1.3354

819.5

613.7

48.70

66.7

1.45750

1.3360

821.1

614.6

48.80

66.8

1.45774

1.3367

822.7

615.5

48.89

66.9

1.45798

1.3373

824.3

616.3

48.99

67.0

1.45822

1.3380

825.9

617.2

49.08

67.1

1.45846

1.3386

827.5

618.1

49.18

67.2

1.45870

1.3393

829.1

619.0

49.27

67.3

1.45893

1.3399

830.7

619.9

49.37

67.4

1.45917

1.3406

832.3

620.8

49.46

67.5

1.45941

1.3412

833.9

621.7

49.56

67.6

1.45965

1.3419

835.5

622.6

49.65

67.7

1.45989

1.3425

837.1

623.5

49.75

67.8

1.46013

1.3432

838.7

624.4

49.84

67.9

1.46037

1.3438

840.3

625.3

49.94

68.0

1.46061

1.3445

841.9

626.2

50.03

68.1

1.46085

1.3451

843.6

627.1

50.14

68.2

1.46109

1.3458

845.2

628.0

50.23

68.3

1.46134

1.3464

846.8

628.9

50.33

68.4

1.46158

1.3471

848.4

629.8

50.42

68.5

1.46182

1.3478

850.0

630.7

50.52

68.6

1.46206

1.3484

851.6

631.6

50.61

68.7

1.46230

1.3491

853.3

632.5

50.71

68.8

1.46254

1.3497

854.9

633.4

50.81

68.9

1.46278

1.3504

856.5

634.3

50.90

69.0

1.46303

1.3510

858.1

635.2

51.00

69.1

1.46327

1.3517

859.8

636.1

51.10

69.2

1.46351

1.3524

861.4

636.9

51.19

69.3

1.46375

1.3530

863.0

637.8

51.29

7.      Expression of results

The results are expressed as a percentage by mass of saccharose m/m (degrees Brix) to two decimal based on the average of two determinations. In the case of the concentrated grape juice multiply the result by the dilution factor (F = 2.5).

8.      Indicative characteristics of the method

A validation study was carried out for the purpose of assessing the suitability of the method for the matrix grape juice, taking into account linearity, limits of detection and quantification and the accuracy of the method. The latter parameter was determined by defining the levels of precision and trueness of the method.

8.1.      Linearity of the method

Based on the results obtained from the linear regression analysis, the method proved to be linear within the ranges 10.0 °Bx to 69.2 °Bx shown in the Table III.

8.2.      Limit of detection and limit of quantification

The detection limit (LD) and limit of quantification (LoQ) were calculated from a grape juice diluted and analyzed and is equal to 3 standard deviations for the LD and 10 standard deviations for the LoQ (Table III).

8.3.      Precision of the method

The parameters taken into account were repeatability and reproducibility. Table III shows the values of these parameters. The repeatability was expressed as standard deviation of repeatability (Sr) of 7 measurements for the following °Brix concentrations: 15.9 °Bx; 69.2 °Bx.

The intermediate precision (IP) was expressed as the Standard Deviation (SIP) of measurements of the same grape juice sample, made by different operators.

Table III- Characteristics of the method

Linearity range (°Bx)

Correlation coefficient (r2 )

LD (°Bx)

LoQ (°Bx)

Repeatability Standard Deviation

  • (n = 7)
  • Sr

Intermediate Precision (IP) Standard Deviation

  • (n = 14)
  • SIP

10.0 – 69.2

0.9999

0.5

1.7

0.03 °Bx

0.04 °Bx

9.      Bibliography

  1. OIV. Compendium of International Methods of Analysis of Wines and Musts. Method OIV-MA-AS2-02.
  2. BS EN ISO 3696, Water for Analytical Laboratory Use — Specification and Test Methods, 1995.