Daniela Rotkiewicz

Phospholipids of Rapeseeds and Rapeseed Oils: Factors Determining Their Content and Technological Significance—A Review

This paper is a review of research on the phospholipids found in the seeds and oils of the rape (Brassica napus). The first part presents the structures and chemical properties of those compounds, the pathway of their synthesis, and location of their occurrence in rapeseeds and describes the predominant compounds with regard to their quality and quantity characteristics. It also discusses the effect of genetic and environmental conditions on the content of phospholipids and their migration to oils, taking into account their technological properties and problems related to their presence in oils. Selected methods for removing phospholipids are also presented.

Possibility use of digital image analysis for the estimation of the rapeseed maturity stage

ABSTRACT Green seeds are considered undesirable impurities in rapeseed mass for edible oil production. The rapeseed maturity degree is mostly determined by visual evaluation of the embryo colour. In this study, digital image analysis (DIA) was used for characterisation of rapeseed samples harvested at different maturity stages. The seed size, surface and cross-section colour in RGB, HSI and L*a*b* colour spaces as well as share of green seeds and content of pigments were determined. The statistically significant correlation coefficients calculated between the chlorophyll pigment content and cross-section colour attributes indicate the potential use of DAI to determine the rapeseed maturity stage.

Wpływ warunków ogrzewania nasion rzepaku i gorczycy białej na cechy olejów do produkcji biodiesla

The aim of the study was to determine the effect of heating conditions of rapeseed and mustard seeds on the pressing yield and characteristics of oils as potential materials for the biodiesel productions. Oils have been pressed from seeds heated at temperatures of 60, 80 and 100°C for 30, 60 and 90 minutes. Pressing was carried out in a laboratory expeller. Quality of oils was defined by determining water and volatile compound contents, the degree of hydrolysis and oxidation, content of chlorophyll and phosphorus, color and the fatty acids composition. It was found that with the