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gwzps211

银虫 (小有名气)

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专业: 生物医用高分子材料

[求助] 这个怎么成球的，真心没搞懂，请教各位呀~

这个怎么成球的，真心没搞懂原理，是怎么作用的，请教各位呀~

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goodlucky

1楼 2012-06-25 17:24:29

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

gwzps211

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看到篇文献是用[C4mim]Cl 这种离子液体溶解纤维素的，这怎么成bead的呢？
A solution of approximately 10 wt %
microcrystalline cellulose (4.8 g) in [C4mim]Cl (50.0 g) was
prepared using microwave pulse heating.9 The solution was
cooled to 60 °C, and 1.0 g of bovine serum albumin (BSA)
was added and homogenized to prepare a mixture containing
1:5 wt % ratio of BSA:cellulose. The material was formed
into beads by dispersing the solution in a rapidly stirring
hot (100 °C) poly(propylene glycol) (PPG 425; Fluka, Buchs
SG, Switzerland) bath using an overhead ultrahigh-torque
stirrer (Caframo Limited, Wiarton, Ontario) set at 850 rpm.
The [C4mim]Cl/cellulose/BSA mixture was slowly added to
the stirring, hot PPG and dispersed to form small beads.
During stirring (30 min), the temperature of the PPG bath
was allowed to fall to approximately 40 °C, facilitating a
hardening (reconstitution) of the outer surface of the [C4-
mim]Cl/cellulose/BSA beads, preventing subsequent agglomeration.
The solution was removed from the stirrer, and
EtOH was slowly added to further reconstitute the beads and
wash the remaining PPG from the material. The beads were
washed five times with EtOH followed by five washings with
DI H2O and then filtered using a set of mesh filters.