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Halal.Wiki

Filtration Methods

Filtration with Gelatine

Fruit juices are often filtered with [[gelatin]] for clarification. In order to obtain a clear juice, Gelatine is used as a means of binding the fruit cloudy substances. The cloudy substances stick to the gelatine and sink to the bottom after they are then removed from the juice. Due to its physical and cost-effective properties, this method is preferred by numerous manufacturers (Özoguz, 2011, p. 79). While a labeling requirement is required for gelatine as an ingredient, such a requirement does not exist for gelatine used as a processing aid (e.g. in clarification of juices). This means that a juice that has been filtered with gelatine does not have to be listed as such in the list of ingredients according to the EU Organic Regulation (biofair-Vereint, k.A.). The European Halal Certification Institute (EHZ) asked about thirty fruit juice manufacturers and came to the conclusion that 50% of these manufacturers use gelatine from pigs for filtration. However, a large number of fruit juice manufacturers are currently switching to vegetarian alternatives, which are explained in more detail below.

 

Filtration with Kieselguhr

Diatomaceous earth is mixed with the fruit juice or other liquid so that certain substances that are in the liquid and adhere to the kieselguhr can be filtered out. The kieselguhr is then also removed from the liquid using certain processes. However, the turbidity that has accumulated on the kieselguhr cannot be completely removed when the kieselguhr is cleaned. To prevent this impurity, there is the alternative of reprocessable kieselguhr (disposable kieselguhr), which can only be used once for filtration, so that mixed production is prevented (Özoguz, 2011, p. 79).

 

Ultrafiltration/Membrane Filter 

The fruit juice is pressed through the pores of a membrane under pressure and is thus separated and concentrated. Nowadays, this method is used more by large companies and manufacturers of branded products (strassburger-filter, n.a.).

 

Filtration in the Ceramic Filter

With this method, the liquid to be filtered is pressed into a ceramic filter, with the pores of the ceramic letting some of the liquid through and catching the other part (the turbidity) and preventing it from getting into the liquid. The problem with this is that the filter has to be cleaned of the particles adhering to it after a certain period of time, but complete cleaning cannot be absolutely guaranteed (Özoguz, 2011, p. 78).

 

References

HalalSchools of LawE-NumbersGelling AgentGelatineFiltration MethodsSeafoodAlcohol-free BeerKefirAlcohol in AromaPolyhydric alcoholsVinegarCarmine E120Shellac E904Cysteine E920Rennet Separated Meat ProductsHalal-Market in Germany