เคมี
เอกสารมาตรฐาน
สหรัฐอเมริกา
AOCS
Cc 13d-55
Chlorophyll Pigments in Refined and Bleached Oils
2017
2
665.0288 AOCS 7th ed. 2017-2019 rev. Ref.
This method is used to determine mg/kg (ppm) of chlorophyll-related pigments (predominantly pheophytin a) in oils from spectrophotometric absorption measurements at 630, 670, and 710 nm. Applicable to expelled oils. For crude or expeller pressed oils, use AOCS Method Cc 13k-13. This method is not applicable to hydrogenated oils, deodorized oils and finished products, because in these processed oils, the absorption maximum does not occur at 670 nm.