第
44
卷第
12
期
2010
年
12
月
浙江大学学报(工学版)
lournal
of
Zhejiang University (Engineering Science)
DOI:
10.
3785/j. issn. 1008-973X. 2010.12.025
Vo
l.
44
No.
12
Dec.
2010
强化两相混合的超临界技术制备聚乳酸微粒
王
琪,蔡美强,关怡新,姚善泾,朱自强
(浙江大学化学士程与生物丁伞程学系,浙江杭州
31002
7)
摘
要:针对商品化聚乳酸微球粒径分布较宽难于适用气溶胶给药要求的不足,采用水力空化混合强化超临界流
体辅助雾化技术
(SAA-HCM)
制备聚乳酸
(PLA)
超细微粒.该技术主要特点是通过在超临界流体和液相进料处引
入水力空化混合器,强化两相间的混合.考察
SAA-HCM
过程混合器压力、温度、沉淀器温度、进料中
CO
2
与液体
溶液质量流量比和溶液质量浓度等操作参数对微粒形态和粒径分布的影响,成功制备出球形度较好,粒径分布较
窄
(l
~3
p.
m)
的
PLA
微球.经
X
射线衍射
(XR
Dl分析和差示扫描量热<D
SC)
分析显示,与原料
PLA
相比,微球晶
型及热曲线变化不大,但结晶度下降.同时把操作参数与相行为进行关联,探讨了影响颗粒形貌的机理.对比超临
界流体辅助雾化法
(SAA)
的实验结果表明:水力空化的引人能有效强化混合器内的两相传质,混合更好,能制备出
适用于气溶胶给药要求的超细微粒.
关键词:超临界流体辅助雾化;水力空化;混合器;传质;聚乳酸;微粒
中图分类号
:TQ
028. 8
文献标志码
:A
文章编号:
1008
- 973X(2010)
12
-
2383
-
08
Micronization
of
polyCIactic acid) by supercritical fluid assisted
at
Ol
nization
with intensifying
tw
o-
phru
写
e
mixing
W
ANG
Qi
,
CAI
Mei-qiang
, G U
AN
Yi-xin
, Y
AO
Shan-jing
,
ZHU
Zi-qiang
(De
户
artment
of
Chemical
ω
nd
Hiochemical
Engineering
,
Zhejiang
University
,
Hangzhou
310027 ,
China)
Abstract:
To
resolve
the
problem
of
wide
particle
size
distribution
of
the
commercial
poly
(lactic
acid)
(PLA)
microspheres
for
aerosol
delivery
, a
nov
e\
technique
named
supercritical
fluid
assisted
atomization
introduced
by
hydrodynamic
cavitation
mixer
(SAA-
HCM)
was
dev
e\
oped
to
prepare
the
PLA
microparticles.
The
primary
advantage
of
SAA-
HCM
is
the
intensifying
mixing
between
supercritical
carbon
dioxide
,
and
liquid
feedstock
by
introducing
a
hydrodynamic
cavitation
mixe
r.
The
effects
of
different
process
parameters
such
as
mixer
pressure
,
mixer
temperature
,
precipitator
temperature
,
mass
flow
ratio
between
carbon
dioxide
and
liquid
solution
,
and
solute
concentration
were
investigated
to
evaluate
their
influences
on
the
morphology
and
size
distribution
of
precipitated
particles.
Microparticles
of
PLA
was
successfully
prepared
with
a
narrow
particle
size
distribution
(1
-3μm)
and
well-defined
spherical
shape
at
optimized
conditions.
Compared
with
the
untreated
PLA
,
X-ray
diffraction
(XRD)
and
differential
scanning
calorimetry
(DSC)
results
suggested
that
there
were
no
significant
changes
in
crystalline
type
and
heat
properties
,
but
prominent
decrease
in
the
crystalline
of
the
resulting
PLA
products
was
observed.
Considering
the
phase
behavior
,
the
influencing
mechanism
of
the
process
parameters
on
the
microparticle
morphology
was
interpr
巳
ted
briefly.
The
results
indicated
that
in
contrast
with
SAA
,
the
intensification
of
the
mass
transfer
between
the
two
phases
in
the
mixer
was
verified
and
very
sharp
PSD
can
be
obtained
,
that
lies
in
the
particle
size
range
of
aerosolizable
drugs.
收稿日期:
2009
-
06
-
09.
浙江大学学报(工学版)网址:
www.journals.zju.edu.cn/eng
基金项目:同家自然科学基金资助项目
(20676118
,
20876139
,
21076185).
作者简介:王琪
(]987-)
,男.安徽宿州人,博士生,从事生物分离下程研究.
E-mail:
wangqil002@zju.edu.cn
通信联系人:姚善泾,男,教授.
E-mail:
yaosj@zju.edu.cn