Naslov
Modified conductometric method of ash determination in wheat flour

Autori
Jukić, Marko ; Ugarčić-Hardi, Žaneta ; Kuleš, Mirko ; Koceva Komlenić, Daliborka ; Jukić, Jasminka ; Jurković, Zorica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract book of International Congress FLOUR-BREAD '03 / Ugarčić-Hardi, Žaneta - Osijek : Prehrambeno tehnološki fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku, 2004

Skup
International Congress FLOUR-BREAD '03 and 4th Croatian Congress of Cereal Technologists

Mjesto i datum
Opatija, Hrvatska, 19.11.2003. - 22.11.2003

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
wheat flour; ash; conductometric method

Sažetak
The ash (or mineral) content serves as a measure for the share level of layer particles in flour and is used for determining the flour type. It is necessary, especially during wheat milling, to determine the ash content in wheat flour as fast and as simple as possible. There are two methods for determining the ash content according to ICC Standard Methods: method of incineration (ICC– Standard No. 104/1) and the method of ash determination by conductivity (ICC-Standard No. 157). Since these two methods take a lot of time, we tried to modify conductometric method insomuch that procedure could be simplified and shortened. ICC-Standard No. 157 demands thermo stating of flour suspension during 1 hour at 30°C and 5 minute centrifugation at 4000 rpm. We, therefore, tested the influence of a shorter extraction time and the influence of electrical conductivity measurement directly in flour-water suspension (without previous centrifugation) on result accuracy. Fifteen samples of wheat flour with the ash content ranging from 0.403 to 1.536 % were tested. Based on the gained results, it could be concluded that electric conductivity measurements indicate high precision results even if carried out directly in flour-water suspension and after only 15 min. Thus, the standard conductivity method of determining the ash content in wheat flour is being modified and therefore, this particular way of determining ash content, is far more simpler, faster and less expensive than the standard method of incineration (ICC– Standard No. 104/1) and the method of ash determination by conductivity (ICC-Standard No. 157). So, it could have an excellent application in industrial practise in cases when it is necessary to quickly obtain data.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

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