Commissione Enologia

Adopted

pH (Type-IV)

OIV-MA-F1-06 pH

Type IV method

Total acidity (Type-IV)

OIV-MA-F1-05 Total acidity

Type IV method

Definition

The total acidity of the rectified concentrated must is the sum of its titrable acidities when it is titrated to pH 7 against a standard alkaline solution.

Carbon dioxide is not included in the total acidity.

Sucrose by high-performance liquid chromatography (Type-IV)

OIV-MA-F1-04 Sucrose by High-Performance Liquid Chromatography

Type IV method

Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM) (Oeno 419A-2011) (Type-IV)

OIV-MA-F1-03 Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM)

Type IV method

Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography (Type-IV)

OIV-MA-F1-02 Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography

Type IV method

Principle of the Method

High-performance liquid chromatography (HPLC)

Separation through a column by reversed-phase chromatography and determination at 280 nm.

Conductivity (Type-IV)

OIV-MA-F1-01 Conductivity

Type IV method

Principle

The electrical conductivity of a column of liquid defined by two parallel platinum electrodes at its ends is measured by incorporating it in one arm of a Wheatstone bridge.

The conductivity varies with temperature and it is therefore expressed at 20°C.