英语翻译The effect of temperature and duration of extraction onc

英语翻译
The effect of temperature and duration of extraction on
carotenoids yield is illustrated in Fig.2.When the duration
is about 40 min,temperature becomes the critical factor for
improving carotenoids yield.The fluctuation of temperature
could lead to large difference in carotenoids yield.It
could be seen from Fig.2 that the optimal temperature and
duration for carotenoids extraction are about 30 1C and
40 min.If the duration is shorter than 40 min,the
dissolving of carotenoids would not reach equilibrium
and part of carotenoids remains in R.sphaeroides.When
the duration is longer than 40 min,the yield of carotenoids
slightly decreases.This might be due to the fact that longtime
exposure of dissolved carotenoids to oxygen,light and
microorganisms in environment leads to the increase
chances of oxidation or degradation of the dissolved
carotenoids (Gang & Zora,2001).
The effect of solvent–solid ratio and duration on
carotenoids yield is shown in Fig.3.The solvent–solid
ratio has a significant linear effect (P ¼ 0.0052) and
quadratic effect (P ¼ 0.0239) on carotenoids yield.The
yield increases when the solvent–solid ratio increases from
10 to 40 but it does not continue to increase significantly
when the ratio is higher than 40.