I ignore the oil contents of your seeds, but since moringa is an oily seed, we recommend to defat the seed before for better performance.
This short-communication explain different methods to defat seeds, where you can choose the one is better for you. The paper is written in Spanish, but basic information can be easily translated to English
Moringa oleifera is potential as an absorber of organic pollutants in the simulation solution. To prepare the samples you can follow the following steps: 1) Removing the shell 2) Kiln drying at 50 ° C 3) Analytical grinding mill 4) Screening 5) Storage in the desiccator 6) Dilution with deionized water (efficient concentrations: from 100 to 500 mg / L)