2024年5月20日发(作者:布安露)
中文摘要
本文研究了天津地区野生黄花蒿植物中青蒿素的提取和分离过程,确定了一条
由青蒿原料出发、较为合理的提取分离工艺路线,并通过误差反向传播(EBP)人
工神经网络技术成功地对提取过程进行了模拟。主要研究内容和结果为:
1.在前人研究的基础上,本文对青蒿素测定方法进行了验证,研究表明,用
紫外分光光度法测定青蒿素的含量,方法简便、准确,但NaOH溶液的质量浓度
应控制在0.2%±O.02%范围之内,否则Q292的吸光值降低,测定结果不准确。
2.根据文献,青蒿素含量达2mg/g以上的青蒿才有提取青蒿素的价值。本文
采用紫外分光光度法,经五次平行实验,测得天津地区黄花蒿中青蒿素的含量平
均为5.0377mg/g,由此认定该地区的青蒿素含量较高,有开发利用价值。
3.比较了冷漫法、索氏提取和恒温搅拌三种提取方式对青蒿素的提取回收率
(青蒿素提取量/原料青蒿素含量),结果分别为:46.48%、68.9%、79.60%,确认
恒温搅拌提取方式回收率最高。对石油醚恒温搅拌提取方式利用单因素实验分析
了温度、时间、搅拌速率、原料粒度、溶剂量等因素对青蒿素提取的影响,结果
表明,各因素对青蒿索提取在一定程度上表现为促进的作用,在一定范围内回收
率增加很快,但超过这个范围,提取回收率随之增加的趋势变缓且逐渐呈现下降
的趋势。采用四因素四水平正交实验方法,得到了青蒿素较好的提取工艺条件,
即提取时间180min,提取温度50。C,搅拌速度800r/min,原料粒度60目,每克
青蒿叶粉溶剂用量为60mL。经五次实验验证,在该条件下青蒿素提取回收率平均
为90%,文献报道的本工艺最好的提取回收率为83%。本实验结果为改进现有青
蒿素石油醚提取工艺提供参考。
4.本文采用质量浓度为70%的稀乙醇进行精制除蜡,效果较佳。采用正交实
验方法,得到了适宜的青蒿素萃取条件,即萃取液中添加剂苯的质量比例为0.2、
萃取液与原料液体积比例为1.0、萃取时间为3h,此时青蒿素的萃取质量比率高达
83.52%。通过结晶和重结晶操作,得到了青蒿素粗晶体。
5.通过对提取(恒温搅拌)、分离(溶剂萃取)、精制(结晶)工艺过程的研
究,最终确定了一条总提取回收率为81.5%(折合成青蒿素提取量/原料量为0.41%)
的青蒿素提取工艺路线,与文献报道的汽油法(青蒿素提取量/原料量为0.3%)、
乙醇法(青蒿素提取量/原料量为O.24%)相比有了很大的提高。
6.考虑到青蒿素提取其萃取产物和过程的复杂性,本文利用神经网络技术实
现了青蒿素提取过程的模拟,模拟结果与实验数据吻合甚好,在此基础上分析了
各因素对提取工艺的影响,结果表明提取温度、提取时间较其他因素对青蒿素提
取回收率的影响显著,可很好的指导实验设计和实验操作。
关键词:
黄花蒿青蒿素提取分离含量测定
ABSTRACT
Extractionand
separation
ofArtemisinin
from
wildArtemisia
wasstudiedinthis
dissertation,a
rationalextraction
annua
L.in
Tianjin
on
technical
route
based
Artemisininrawmaterialwas
established,and
thesimulationoftheextraction
process
wasachieved
using
the
oftheresearchincluded:
1.The
measurationmethodofArtemisinin
Was
verified
based
Oil
error
back-propagation
network.The
main
contents
and
results
previous
studies,
and
theUltraviolet
Spectrophotometry
wasselected
as
a
simple
accurate
method,but
themassconcentrationofNaOHsolutionshouldbewithin
0.2%±O.02%,otherwise,
the
absorbance
of
Q292
wouldbe
reduced,and
the
accuracy
ofthe
content
determinationwasalSOaffected.
2.Artemisinin
fromArtemisia
content
of
allnua
L.WaS
only
worth
extracting
when
it’S
to
literature.Using
theUltraviolet
as
Artemisinin
wasabove
2mg/g
according
content
of
Spectmphotometry,the
ArtemisininWaSdetermined
5.0377mg/g
afterfive
parallel
experiments.Thus
the
conclusion
WaSconfirmed
that
the
content
ofArtemisinin
in
Tianjin
Was
comparatively
high,and
Artemisia
arlnua
L.in
Tianjin
WaS
worth
exploiting
and
using.
3.The
constant—temperature
stirring
extractionwas
affirmed
having
the
highest
extraction
mass
rate
of
recovery,compared
wim
the
infusing
under
room
temperature
andSoxhletextraction
methods.whichmass
rate
of
recovery
was
46.48%and
68.9%.
Theeffectsof
temperature,time,stirring
speed,grinding
drgree
of
material,quantity
of
solvent
and
other
factors
on
theextraction
rate
of
recovery
were
discussed,and
the
resultswerealso
given
thatthosefactorswerebeneficial
to
theextractionof
Artemisinin
within
this
a
certain
range,and
the
extraction
rate
of
recovery
got
a
rapid
increase
within
range,then
the
increasing
tendency
slowed
down
and
graduallypresented
the
downtrend
beyond
this
range.By
the
optimizingexperiment,theappropriate
technical
conditions
were
established
rate
at
as
extraction
time
at
180min,temperature
at
50℃,stirring
grindingdegree
at
800
r/rain,material
60meshes,solvent
rate
quantity
at
60mL/g.Under
those
conditions,the
average
extraction
recovery
ofArtemisinin
was
a
90%,but
inliteraturewas
only
83%.These
experiment
results
could
be
improving
theextraction
techniques.
guide
for
4,The
solution
betterresultof
refining
and
dewaxing
Was
achieved
by
using
the
ethanol
with
massconcentration
of
70%.By
the
optimizingexperiment,the
appropriate
as
technical
conditionswere
establishedextractiontime
at
3
hours,mass
proportion
of
1.0.Undertheseadditivebenzeneat0.2.volume
proportion
ofextractionsolvent
at
2024年5月20日发(作者:布安露)
中文摘要
本文研究了天津地区野生黄花蒿植物中青蒿素的提取和分离过程,确定了一条
由青蒿原料出发、较为合理的提取分离工艺路线,并通过误差反向传播(EBP)人
工神经网络技术成功地对提取过程进行了模拟。主要研究内容和结果为:
1.在前人研究的基础上,本文对青蒿素测定方法进行了验证,研究表明,用
紫外分光光度法测定青蒿素的含量,方法简便、准确,但NaOH溶液的质量浓度
应控制在0.2%±O.02%范围之内,否则Q292的吸光值降低,测定结果不准确。
2.根据文献,青蒿素含量达2mg/g以上的青蒿才有提取青蒿素的价值。本文
采用紫外分光光度法,经五次平行实验,测得天津地区黄花蒿中青蒿素的含量平
均为5.0377mg/g,由此认定该地区的青蒿素含量较高,有开发利用价值。
3.比较了冷漫法、索氏提取和恒温搅拌三种提取方式对青蒿素的提取回收率
(青蒿素提取量/原料青蒿素含量),结果分别为:46.48%、68.9%、79.60%,确认
恒温搅拌提取方式回收率最高。对石油醚恒温搅拌提取方式利用单因素实验分析
了温度、时间、搅拌速率、原料粒度、溶剂量等因素对青蒿素提取的影响,结果
表明,各因素对青蒿索提取在一定程度上表现为促进的作用,在一定范围内回收
率增加很快,但超过这个范围,提取回收率随之增加的趋势变缓且逐渐呈现下降
的趋势。采用四因素四水平正交实验方法,得到了青蒿素较好的提取工艺条件,
即提取时间180min,提取温度50。C,搅拌速度800r/min,原料粒度60目,每克
青蒿叶粉溶剂用量为60mL。经五次实验验证,在该条件下青蒿素提取回收率平均
为90%,文献报道的本工艺最好的提取回收率为83%。本实验结果为改进现有青
蒿素石油醚提取工艺提供参考。
4.本文采用质量浓度为70%的稀乙醇进行精制除蜡,效果较佳。采用正交实
验方法,得到了适宜的青蒿素萃取条件,即萃取液中添加剂苯的质量比例为0.2、
萃取液与原料液体积比例为1.0、萃取时间为3h,此时青蒿素的萃取质量比率高达
83.52%。通过结晶和重结晶操作,得到了青蒿素粗晶体。
5.通过对提取(恒温搅拌)、分离(溶剂萃取)、精制(结晶)工艺过程的研
究,最终确定了一条总提取回收率为81.5%(折合成青蒿素提取量/原料量为0.41%)
的青蒿素提取工艺路线,与文献报道的汽油法(青蒿素提取量/原料量为0.3%)、
乙醇法(青蒿素提取量/原料量为O.24%)相比有了很大的提高。
6.考虑到青蒿素提取其萃取产物和过程的复杂性,本文利用神经网络技术实
现了青蒿素提取过程的模拟,模拟结果与实验数据吻合甚好,在此基础上分析了
各因素对提取工艺的影响,结果表明提取温度、提取时间较其他因素对青蒿素提
取回收率的影响显著,可很好的指导实验设计和实验操作。
关键词:
黄花蒿青蒿素提取分离含量测定
ABSTRACT
Extractionand
separation
ofArtemisinin
from
wildArtemisia
wasstudiedinthis
dissertation,a
rationalextraction
annua
L.in
Tianjin
on
technical
route
based
Artemisininrawmaterialwas
established,and
thesimulationoftheextraction
process
wasachieved
using
the
oftheresearchincluded:
1.The
measurationmethodofArtemisinin
Was
verified
based
Oil
error
back-propagation
network.The
main
contents
and
results
previous
studies,
and
theUltraviolet
Spectrophotometry
wasselected
as
a
simple
accurate
method,but
themassconcentrationofNaOHsolutionshouldbewithin
0.2%±O.02%,otherwise,
the
absorbance
of
Q292
wouldbe
reduced,and
the
accuracy
ofthe
content
determinationwasalSOaffected.
2.Artemisinin
fromArtemisia
content
of
allnua
L.WaS
only
worth
extracting
when
it’S
to
literature.Using
theUltraviolet
as
Artemisinin
wasabove
2mg/g
according
content
of
Spectmphotometry,the
ArtemisininWaSdetermined
5.0377mg/g
afterfive
parallel
experiments.Thus
the
conclusion
WaSconfirmed
that
the
content
ofArtemisinin
in
Tianjin
Was
comparatively
high,and
Artemisia
arlnua
L.in
Tianjin
WaS
worth
exploiting
and
using.
3.The
constant—temperature
stirring
extractionwas
affirmed
having
the
highest
extraction
mass
rate
of
recovery,compared
wim
the
infusing
under
room
temperature
andSoxhletextraction
methods.whichmass
rate
of
recovery
was
46.48%and
68.9%.
Theeffectsof
temperature,time,stirring
speed,grinding
drgree
of
material,quantity
of
solvent
and
other
factors
on
theextraction
rate
of
recovery
were
discussed,and
the
resultswerealso
given
thatthosefactorswerebeneficial
to
theextractionof
Artemisinin
within
this
a
certain
range,and
the
extraction
rate
of
recovery
got
a
rapid
increase
within
range,then
the
increasing
tendency
slowed
down
and
graduallypresented
the
downtrend
beyond
this
range.By
the
optimizingexperiment,theappropriate
technical
conditions
were
established
rate
at
as
extraction
time
at
180min,temperature
at
50℃,stirring
grindingdegree
at
800
r/rain,material
60meshes,solvent
rate
quantity
at
60mL/g.Under
those
conditions,the
average
extraction
recovery
ofArtemisinin
was
a
90%,but
inliteraturewas
only
83%.These
experiment
results
could
be
improving
theextraction
techniques.
guide
for
4,The
solution
betterresultof
refining
and
dewaxing
Was
achieved
by
using
the
ethanol
with
massconcentration
of
70%.By
the
optimizingexperiment,the
appropriate
as
technical
conditionswere
establishedextractiontime
at
3
hours,mass
proportion
of
1.0.Undertheseadditivebenzeneat0.2.volume
proportion
ofextractionsolvent
at