Quantitative change of azadirachtin content in neem seed kernel from different drying temperatures
1998
Unchalee Sanguanpong (Rajamangala Institute of Technology. Pathumthani Campus, Pathum Thani (Thailand). Faculty of Agricultural Engineering and Technology. Dept. of Postharvest Technology and Processing)
Study on azadirachtin content in neem seed kernel affected by different drying temperatures at 60, 75 and 90 deg C was compared to the two traditional methods: sunlight (control 1) and sunlight follwed by drying at 60 deg C (control 2). Measuring the azadirachtin content by using High Performance Liquid Chromatography technique indicated that the maximum content was 4.75 mg/g seed kernel in treatment with drying temperature at 75 deg C. The next in line were 4.13, 3.03 mg/g seed kernel by drying temperature at 90 and 60 deg C respectively. While the azadirachtin content in control 1 was less than control 2. However, statistical difference between treatments was not found. On the contrary, the drying time to reduce the moisture content in neem seed kernel to 14 percent was drastically reduced by increasing temperature. By 60 deg C the drying time was 21 hours, while increasing temperature to 75 and 90 deg C could reduce the time to 6 and 4 hours respectively. Furthermore, it was found that drying time in control 2 was only 16 hours and less than by only drying at 60 deg C. It was here shown that by increasing temperature the azadirachtin content in neem seed kernel was not affected, not statistical difference between each treatment and the drying time was also decreased.
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