EP0990154A1 - Appareil con u pour effectuer plusieurs tests sur des echantillons de vins ou similaires - Google Patents

Appareil con u pour effectuer plusieurs tests sur des echantillons de vins ou similaires

Info

Publication number
EP0990154A1
EP0990154A1 EP98917605A EP98917605A EP0990154A1 EP 0990154 A1 EP0990154 A1 EP 0990154A1 EP 98917605 A EP98917605 A EP 98917605A EP 98917605 A EP98917605 A EP 98917605A EP 0990154 A1 EP0990154 A1 EP 0990154A1
Authority
EP
European Patent Office
Prior art keywords
sample
probe
membrane
solution
glass bulb
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98917605A
Other languages
German (de)
English (en)
Inventor
Marco Mascini
Andrea Cagnini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Biofutura Srl
Original Assignee
Biofutura Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Biofutura Srl filed Critical Biofutura Srl
Publication of EP0990154A1 publication Critical patent/EP0990154A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G01N33/14—Beverages
    • G01N33/146—Beverages containing alcohol
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/36—Glass electrodes

Definitions

  • Apparatus adapted to perform a plurality of determinations on wine samples or the like.
  • the present invention relates to an apparatus adapted to perform a plurality of determinations on wine samples or the like, comprising probing means for analysing a sample, means for containing at least one sample to be analysed and automatic instruments for performing said determinations.
  • an alcoholic drink such as the wine contains a plurality of substances, which maybe are not all yet been well identified, as well as it comprises a plurality of physical-chemical data, which could define its gifts, its endowments and their evolution with time.
  • the organoleptic properties of the wine are subject to a continuous evolution with time, too. It is sufficient to reflect that the ageing of at least certain wines can define their quality and therefore their not only commercial value. Therefore it is from time immemorial that the centuries intended to analyse the wine, as well as other alcoholic or not alcoholic drinks (cognac, brandy, beer, fruit juices, etc.) thanks to the utilization of processes and apparatuses, which were developped with the time and which are based on more and more sophisticated methods of the chemical and biological technology.
  • Such users could be small-middle size producers and/or distributors of wines, which were up to now damaged by the substantially high purchasing and running costs of the apparatuses for the analysis of wine or the like (alcoholic or not alcoholic drinks) parameters. It is to be repeated that the big producers/distributors of wines have at their disposal analysis laboratories provided with very expensive apparatuses, which are operated by skilled (and therefore expensive) people. The requirements which are to be satisfied by said companies are really connected to their dimensions. Indeed said apparatuses:
  • the apparatuses which are utilized by said big companies, are usually based on distillation technologies and can provide data mainly in the direction of alcoholic degrees, volatile acidity, etc. In addition they are extremely rapid for performig the analyses, as they require just some minutes and about a hundred millilitres of liquid to be distilled.
  • spectrophotometers which are based on gases, liquids but their purchasing costs and running espenses (due to skilled operators, who should operate them) allow them to be operated just in central laboratories at the level of R&D University and/or big Companies centers. It is to be added that the most above described apparatuses usually require pre-treatment processes of the drinks to be analysed, whereby analysis times and costs are increasing.
  • Some apparatuses are well known, which are comprising a glass bulb, where the glass should be permeable to ions. Such apparatuses are defined “combined pH probes", because they are just adapted to gauge the pH of a solution.
  • a membrane probe should be present, where the membrane is sensitive to gas.
  • Said probe is substantially made of a combined pH electrode, which is separated from the sample by means of a membrane.
  • a problem is arising whenever a pH probe is utilized for requirements, which go beyond the PH solution gauging, for instance for the determination of wine parameters: the kind of the material of the membrane, its particular thickness, as well as the absolute requirement of a substantially perfect adhesion of the membrane to the glass bulb.
  • the apparatus according to the invention which is characterized in that it is based on a combined pH probe, said probe being adapted to comprise a substantially flat, gas permeable, having a thickness comprised into a (5-100 micron) range membrane, said membrane being co-operating with an electrochemical pH glass bulb, means being provided for obtaining a substantially complete adhesion of said membrane on a flat surface of the glass bulb in order to allow the diffusion of gaseous compounds from a sample solution to an internal solution.
  • Fig.2 represents a sectional view of an electrochemical PH probe comprised in the apparatus according to the invention.
  • the apparatus comprises a keyboard with a key 1 (Fig.l) which is adapted, as it will be explain later on, to gauge the pH, a key 2 for gauging the total acidity, a key 3 for gauging the volatile acidity, a key 4 for gauging the sulphur dioxide free and a key 5 for gauging the sulphur dioxide bound, all these substances belonging, for instance, to a wine sample.
  • a key 1 Fig.l
  • a key 1 for gauging the total acidity
  • a key 3 for gauging the volatile acidity
  • a key 4 for gauging the sulphur dioxide free
  • a key 5 for gauging the sulphur dioxide bound
  • This pH glass probe comprises a housing 7, which contains a specific probe 8. Such a probe is adapted to be inserted into the housing 7 after filling it, as it will be apparent later on, with a so-called "internal solution”.
  • a sleeve 9 is adapted to be screwed in correspondence of the bottom ot the housing 7.
  • a glass container 10 is adapted to contain a small quantity of the liquid to be analised.
  • the probe 8 internally contains a room 11 for a working electrode, whereas in its upper portion it contains a room 12 for a reference electrode, the working electrode and the reference electrode being adapted to satisfy a requirement, such as the gauge of a potential difference, which could be translated into a value of some potential parameters for instance of a wine or the like.
  • Two circular plates 13 should avoid that the liquid contained into the working electrode 11 could pour out.
  • the internal chamber of the probe 8 tapers into a ring 14, which is usually made of teflon, whereas a cylindrical glass probe 16 is hermetically sealed within the circular room of the ring 14.
  • the glass probe 16 represents what is usually called “indicator electrode” and what is per se an electrochemical pH glass probe, but, when it cooperates with a membrane 17, it could become a tool adapted to perform multiple determinations, for instance on wine (or spirit or similar drinks) samples.
  • the membrane 17 should separate the sample, which is contained in the container 10, from the glass probe 16.
  • Many kinds of membranes could used, but all these membranes must satisfy the following requirement: they shouldn't be wettable whenever they come into contact with liquid of the sample, as well as they should be permeable to gas.
  • the active surface of the indicator electrode 16 is put in contact with the membrane 17, in such a way that a substantially thin layer of electrolytic solution (i.e.
  • the membrane 17 doesn't perfectly adhere to the indicator electrode 16, the thin layer of the electrolytic solution could't be shaped, whereby no significant and actual potential difference could be gauged. Consequently, for instance, the acetic acid, which is contained in a wine sample, should pass through the membrane 17 and the apparatus according to the invention should gauge this value just if the membrane 17 is properly stretched on the flat surface of the glass probe 16. This result could be achieved just if the glass probe 16 protrudes with its flat surface on the ring 14 thanks to a projection H. Furthermore the stretching action of the membrane 17 on the glass probe 16 is obtained by screwing the housing 7 on the sleeve 9 after interposing the membrane 17 between the housing 7 and the sleeve 9.
  • the thickness of the membrane should be comprised within a range of (5-100 micron), its material could be made of polyethylene, polypropilene, teflon or similar porous plastics, with porosity comprised within a range of (0,01-2) micron in order to allow the diffusion of gaseous compounds from a sample solution to the "internal solution".
  • the "internal solution” of the gas membrane probe should be changed every time in order to obtain a probe, for instance, for acetic acid (volatile acidity) and sulphur dioxide (free or bound).
  • the apparatus according to the invention could be utilized for gauging the pH of a solution.
  • the apparatus resembles to a simple pHmeter, where no membrane is necessary on the glass probe 16.
  • the apparatus through the display 6 shows the result of this gauging operation.
  • the apparatus gauges the mV. values before the addition and after the addition.
  • the microprocessor calculates the content of the acidity of the sample expressing it as g/1. of tartaric acid. Simple messages guide according a way known per se the operator to the gauging operations and to the addition, providing in such a way the final result.
  • the above mentioned probe is assembled for such measurement. Therefore the "internal solution” is prepared with few millilitres of a solution of sodium acetate 1 M and the glass probe 16 is fitted against the flat gas membrane 17. In such a way the pH probe before described is converted into an acetic acid probe.
  • Such probe is immersed into 8 ml. of H2SO 1 M under stirring: the mV. value so obtained is recorded. Then 1 ml. of sample/standard is added. The mV. value is recorded and the microprocessor of the apparatus according to the invention directly calculates the content of acetic acid in the sample.
  • the measurement of sulphur dioxide can be obtained with the same already described gas probe by changing the internal electrolyte of the gas electrode (the "internal

Abstract

L'invention concerne un appareil qui effectue plusieurs tests sur des échantillons de vins ou similaires. Il comporte un échantillon (8) basé sur un détecteur combiné de pH (8, 14, 16) pourvu d'une membrane (17) plate, perméable aux gaz, ayant une épaisseur entre 5 et 100 micromètres et qui coopère avec une ampoule électromécanique en verre (16). Pour permettre la diffusion de composés gazeux d'un échantillon de vin à travers l'ampoule en verre (16) et dans une solution interne, on assure l'adhérence complète de la membrane (17) à la surface plane de l'ampoule en verre (16) dont fait saillie une protubérance (H) permettant l'étirage de la membrane (17) à la surface plane.
EP98917605A 1998-04-15 1998-04-15 Appareil con u pour effectuer plusieurs tests sur des echantillons de vins ou similaires Withdrawn EP0990154A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT1998/000087 WO1999053312A1 (fr) 1998-04-15 1998-04-15 Appareil conçu pour effectuer plusieurs tests sur des echantillons de vins ou similaires

Publications (1)

Publication Number Publication Date
EP0990154A1 true EP0990154A1 (fr) 2000-04-05

Family

ID=11332891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98917605A Withdrawn EP0990154A1 (fr) 1998-04-15 1998-04-15 Appareil con u pour effectuer plusieurs tests sur des echantillons de vins ou similaires

Country Status (2)

Country Link
EP (1) EP0990154A1 (fr)
WO (1) WO1999053312A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1303758B1 (fr) * 2000-07-14 2006-12-27 LifeScan, Inc. Procede electrochimique pour mesurer des vitesses de reactions chimiques
CA2733852A1 (fr) * 2000-07-14 2002-01-24 Lifescan, Inc. Procede electrochimique pour mesurer des vitesses de reactions chimiques
FR2816409B1 (fr) * 2000-11-09 2003-05-02 Ecole D Ingenieurs De Geneve Appareil de mesure de parametres physiques d'un mout de raisin et du vin obtenu a partir de ce mout
NZ609194A (en) 2010-11-30 2015-03-27 Foss Analytical As Determination of sulphur dioxide in a liquid
JP2022532664A (ja) * 2019-05-16 2022-07-15 ラ トローブ ユニバーシティ 分析物決定のためのシステムおよび方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH549801A (de) * 1972-04-21 1974-05-31 Dso Vinprom Geraet zur messung der kennwerte von oxydations-reduktionsprozessen, insbesondere bei der weinherstellung und anderen fermentationsvorgaengen.
US3998717A (en) * 1974-10-01 1976-12-21 Owens-Illinois, Inc. Glass electrode for membrane diffusion analysis of gases
JPS5910845A (ja) * 1982-07-09 1984-01-20 Sanwa Shoji Kk 液中亜硫酸の定量法およびその定量装置
GB8407835D0 (en) * 1984-03-27 1984-05-02 Univ Strathclyde Electrochemical assembly
SU1430889A1 (ru) * 1985-05-15 1988-10-15 Краснодарский политехнический институт Способ измерени содержани растворенного газа в вине,виноматериале и безалкогольном напитке
DE19515065A1 (de) * 1995-04-27 1996-02-01 Kurt Schwabe Inst Fuer Mes Und Elektrochemischer Gassensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9953312A1 *

Also Published As

Publication number Publication date
WO1999053312A1 (fr) 1999-10-21

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