Low-Cost Investment with High Quality Performance. Bleaching Earths for Phosphorus Reduction in the Low-Temperature Bleaching Process of Rapeseed Oil

Barbara Łaska-Zieja , Wojciech Golimowski , Damian Marcinkowski , Gniewko Niedbała , Ewelina Wojciechowska


Rapeseed oils are a valuable component of the diet. Mostly, there are refined oils deprived of valuable nutrients in the market, hence in recent times cold-pressed and unrefined oils have been available and popular among consumers. However, the low yield of this oil makes this product expensive. The aim of the study was to analyse the effectiveness of phosphorus reduction in crude oils, cold- and hot-pressed in the low-temperature bleaching process. Eight market-available bleaching earths was compared. The effectiveness of 90% was found with 2% (m/m) of Kerolite with hydrated magnesium silicate. An increase in the share of earths to 4% (m/m) resulted in the effectiveness of phosphorus reduction >90% in seven out of eight analysed cases. Bentonite activated with acid with the lowest MgO content was characterised by low efficiency <64%. The research shows that the effectiveness of phosphorus reduction was significantly affected by the composition of earths applied in the bleaching process at ambient temperature. The results of research confirm the high effectiveness of the process as it is not necessary to heat up the oil before the bleaching process. This method is recommended for existing and new industrial plant for two-stage rapeseed oil pressing.
Author Barbara Łaska-Zieja
Barbara Łaska-Zieja,,
, Wojciech Golimowski (PE / DAEQA)
Wojciech Golimowski,,
- Department of Agricultural Engineering and Quality Analysis
, Damian Marcinkowski (PE / DAEQA)
Damian Marcinkowski,,
- Department of Agricultural Engineering and Quality Analysis
, Gniewko Niedbała - Poznań University of Life Sciences (UPP)
Gniewko Niedbała,,
, Ewelina Wojciechowska - Norwegian Institute of Bioeconomy Research (NIBIO)
Ewelina Wojciechowska,,
Journal seriesFoods, ISSN 2304-8158, (N/A 70 pkt)
Issue year2020
Publication size in sheets0.5
Keywords in Englishrapeseed oil, bleaching process, bleaching earth, phosphorus, food technology
Languageen angielski
Laska-Zieja_Golimowski_Marcinkowski_Niedbala_Wojciechowska_Low-cost_ investment_ with_ high_ quality_ performance2020.pdf 556,18 KB
Score (nominal)70
Score sourcejournalList
Publication indicators WoS Impact Factor: 2018 = 3.011 (2)
Citation count*
Share Share

Get link to the record

* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.