Attached
M longifolia is a plant with a seed rich of edible oil (more than 50%), but is still under-utilized for edible purposes in Sri
Lankan context. It shows a wide distribution throughout the country representing several agro-climatic zones. No studies
have done yet to discover variations of M longifolia seed oil with respect to its different geographical locations. In this
study, the content o f p-carotene in M. longifolia seed oil samples obtained from four different agro-climatic zones in Sri
Lanka was evaluated. The effect of heat on the stability of p-carotene in M longifolia seed oil was also studied. Dried,
fallen seeds were collected from randomly selected trees in four agro-climatic zones in Sri Lanka named low country dry
zone (LD), low country wet zone (LW), low country intermediate zone (LI) and mid country intermediate zone (MI). Oil
was extracted with a small scale, mechanical oil expeller (cold pressed method). P-carotene content in four samples was
assessed with MPOB test method using Ultraviolet-Visible (UV-VIS) spectrophotometer and with High Performance
Liquid Chromatography (HPLC) using Chase et al., (1994) method. A series of heat treatment (50 °C - 300 °C) was given
and die content of p-carotene was determined at each temperature with the above mentioned two methods. There were some
differences in the content ofp-carotene for two types of methods, p-carotene content varies from 17.69 to 13.51 ppm in four
agro-climatic zones for HPLC method and 20.46 - 27.69 ppm for spectrophotometric method. The reduction of P-carotene
content up to 150 °C from the room temperature (30 °C) was not prominent. But after 150 °C, a sudden, sharp decrease was
reported. Nutritional composition of seed cake varied significantly (p <0.05) among the different agro-climatic zones.
Protein content, similar to Palm kernel was reported which ranged from 15.44 -17.76% .
