Effect of storage conditions on the dietary and pharmaceutical values of ginger oil, and modeling its dielectric properties

This research was conducted to evaluate the impact of the storage conditions of ginger rhizomes on the nutritional and therapeutic properties of the ginger oil (GO). The physicochemical and phytochemical properties, fatty acid contents and dielectric constant (ε′) of the GO were analyzed in accordance with standard guidelines. The findings revealed that the storage temperature significantly impacted the quality of GO (p < 0.05). Notably, the oil contains a significant amount of acid value (AV), free fatty acid (FFA), saponification value (SV), iodine value, vitamin C, phenolic compounds, and polyunsaturated fatty acids (PUFAs). Furthermore, the findings demonstrated a strong correlation between the GO’s ε′ and its AV, FFA and saturated fatty acid contents. A predictive model was developed using Stepwise Linear Regression to forecast the GO dielectric properties based on its measured physicochemical properties. Comparison of the model’s predictions with the experimental results revealed reliable forecasting, indicating the usefulness of the model for evaluating the oil quality and electrical properties.