- Acronym for "Deterioration of Bleaching Index"
- Easily obtained by simple spectrophotometric measurement and is used to predict the ease of bleaching of crude palm oil during refining
- Is defined as the numerical ratio of the uncorrected absorbance at 446nm to that at 269nm
- DOBI = (Absorbance at 446nm) / (Absorbance at 269nm)
- Crude palm oil quality : DOBI - Good (3-4) ; Average (2-3) ; Poor (<1)
- Absorbance 446 is related to carotene content
- Absorbance 269 is related to secondary oxidation of crude palm oil
- Factors effecting these two parameters will thus also affect the DOBI value
- To have good DOBI value, attempts must be taken to minimise deterioration of carotene and also oxidation
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