The main product of camelina (Camelina sativa (L.) Crantz) is its high nutritional oil, but also its oilcakes contain high levels of proteins, carbohydrates, vitamins, minerals, and low level of phytochemicals such as glucosinolates (GLS) compared with other Brassica species. The aim of this study was to evaluate different camelina cultivars (Danish cultivars Vega and Hoga, German cultivars Calena, organically produced Calena (Bio Calena) and Ligena, and Slovenian autochthonous cultivar) grown in year 2012 on four different locations in Slovenia to find out the chemical composition of seeds and oilcakes as a by-product in oil production that could be used as feed for animals. The content of glucosinolates did not preclude the use of seeds and/or camelina oilcake in animal nutrition. Content of a particular GLS in seeds and consequently in oilcakes was strongly influenced by both environmental conditions during the growing period and by botanical origin. In seeds GLS-10 (6.9–28.5 mmol/g) was the most dominant GLS in all samples. The relative amount of GLS-10 (glucocamelinin) among all GLS was from 59 to 70 %. The second one was GLS-9 (glucoarabin; 1.3–15.3 mmol/g) followed by GLS-11 (11-(metilsulfonil) undecilglucosinolate; 1.5–7.6 mmol/g). The total amount of GLS in the samples ranged from 13.0 to 48.9 mmol/g (mean 24.8 mmol/g). At cultivars Vega and Hoga there was significantly lower content of GLS in oilcakes in comparison to seeds, while in all other cases the contents are comparable.
COBISS.SI-ID: 635020
The influence of deodorization parameters (temperature (T), steam flow (S), time (t)) on the phenolic content and radical scavenging effectiveness (RSE) of methanolic extracts of camelina oil was investigated and analyzed by response-surface methodology (RSM). The phenolic content can be considered to be a linear function of all three parameters. A positive linear relationship between the content of phenolic compounds in deodorized oils and RSE was observed. Deodorization at 210 °C with a steam flow of 3 mL/h for 90 min resulted in the best preservation of phenolics, amounting to 29.9 mg/kg. The lowest reduction from RSE of 12.4 μM Trolox equivalents (TE)/g oil for the crude oil was observed for oil treated at 195 °C and 18 mL/h for 60 min with RSE of 10.1 μM TE/g oil. The lack of correlation between RSE or total phenolic content and oxidative stability (OS) of the deodorized oils suggests that antioxidants in scavenging radicals react by different mechanisms, depending on radical type and reaction medium.
COBISS.SI-ID: 4278136