2.6. 50-Nucleotide assay
50-Nucleotides were extracted as described by Taylor,
Hershey, Levine, Coy, and Olivelle (1981). Different degrees of
dried samples were weighed, ground sufficiently, and extracted
with 10 mL of distilled water. The suspension was heated to
boiling for 1 min, cooled and then centrifuged at 4500g for
15 min. The residues were washed three times with 10 mL
of distilled water, and the combined filtrates were rotary evaporated
and redissolved in distilled water to a final volume of
10 mL and filtered using a 0.45-lm micro-pore filter membrane
before analysing.