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Explanation: ..persoalan kajian ini adalah untuk mengkaji kehadiran komponen minor dan perubahan stuktur lipid di dalam minyak dan lemak disebabkan kesan pengoksidaan..
from the above it appears as to me that "persoalan" here refers to the intention of carrying out the study.
Hence, I would be more inclined to use The intention of this study or the motive of this study
The intention/motive of this research is to study the presence of minor components and the change/transformation of lipid structure in oil and fat caused by oxidation