2.9. Statistical Analysis
Data analysis was performed using SAS (version 9.3) for Windows (SAS
Institute Inc, 2008). Analysis of variances was conducted using the GLM
procedure. A Tukey test was used to determine significance differences
at 95% level of confidence (p<0.05).
RESULTS AND DISCUSSION
Soybean oil samples were exposed to the direct cold plasma between the
electrodes. The intense treatment drove out two of the sample outside
the glass petri dish. Therefore, three fractions were analyzed from each
treated sample (for 2h, 4h, and 6h): liquid, gel, and solid (Fig. 1c).
Liquid fraction (94.5 %) was collected from the petri dish and had less
contact with reactive plasma species. Gel fraction (2.5 %) was
collected from the bottom of the box, and it escaped from the petri dish
due to the intense treatment. Solid fraction (3 %) was collected from
the top of the box, and it was the sample with higher exposure to plasma
treatment.