CHEMICAL CHANGES OF PADDY DURING METAL SILO STORAGE

Abstract

ABSTRACT
Objective: To study the chemical changes of paddy stored at metal silo for a period of 6-month.
Methods: The peroxide value (PV) and free fatty acids (FFAs) were analyzed by titrimetry method. The total fatty acid profile was analyzed through
gas chromatography-mass spectrometry (GC-MS) (Scion 436-GC Bruker model coupled with a triple quadrupole mass spectrophotometer) and
National Institute Standard and Technology-MS library.
Results: The PV of paddy at the 1
st
month of storage is 0.62 mEq/kg and at the 6
month the value increases to 5.11 mEq/kg and initial FFA was
recorded as 0.49% and final value of 2.28%. In accordance with these data, the GC-MS study of rice bran oil (RBO) proved that polyunsaturated fatty
acid percentage is decreasing over the period of storage time.
th
Conclusion: With the results and findings, the overall chemical change during the 6-month storage of paddy at metal silo does not affect the RBO
quality significantly.
Keywords: Free fatty acids, Peroxide value, Metal silo, Gas chromatography-mass spectrometry.