CN111330311B - 一种相变诱导靶标富集的方法 - Google Patents
一种相变诱导靶标富集的方法 Download PDFInfo
- Publication number
- CN111330311B CN111330311B CN202010091386.7A CN202010091386A CN111330311B CN 111330311 B CN111330311 B CN 111330311B CN 202010091386 A CN202010091386 A CN 202010091386A CN 111330311 B CN111330311 B CN 111330311B
- Authority
- CN
- China
- Prior art keywords
- sensing
- phase
- target
- detection
- interface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 12
- 230000035945 sensitivity Effects 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 27
- 239000010931 gold Substances 0.000 claims description 22
- 229910052737 gold Inorganic materials 0.000 claims description 22
- 230000008859 change Effects 0.000 claims description 8
- 239000002105 nanoparticle Substances 0.000 claims description 6
- 108020004707 nucleic acids Proteins 0.000 claims description 6
- 150000007523 nucleic acids Chemical group 0.000 claims description 6
- 102000039446 nucleic acids Human genes 0.000 claims description 6
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 108020004414 DNA Proteins 0.000 description 19
- 239000002077 nanosphere Substances 0.000 description 15
- 239000000243 solution Substances 0.000 description 13
- 230000007704 transition Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 239000000427 antigen Substances 0.000 description 3
- 102000036639 antigens Human genes 0.000 description 3
- 108091007433 antigens Proteins 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 3
- 238000002965 ELISA Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 206010020751 Hypersensitivity Diseases 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 230000004001 molecular interaction Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 108091028043 Nucleic acid sequence Proteins 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003317 immunochromatography Methods 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002547 new drug Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Abstract
本发明公开了一种相变诱导靶标富集的方法,在进行生物或化学传感检测的过程中,通过传感体系的相变过程把低丰度靶标富集到传感界面表面形成具有局部较高浓度的靶标区域从而提高检测的灵敏度。该方法通过传感界面附近的靶标富集产生信号放大,从而实现对现有传感方法的检测灵敏度提升。
Description
技术领域
本发明涉及生物及化学检测或传感领域。作为一种通用靶标富集手段,本发明应能用于所有溶液相,基于界面分子相互作用的生化检测技术。
背景技术
大部分现存的生物及化学检测方法,如酶联免疫法(ELISA)和基于核酸的检测技术等,分子的相互作用往往导致固-液界面附近的电荷发生转移,使得传感器的某种光或者电信号发生改变。一般来说,生物或化学传感器主要由传感界面,信号源及信号放大组块和信号展示等组块构成。比较经典的检测/传感器例子有:病毒/抗原检测试纸/试剂、抗体检测试纸/试剂、血糖传感器、核酸检测试剂、基因芯片、水中有害物质检测装置等等。生化传感器的应用十分广泛,包括在疾病检测、食品安全、新药研发、新药研发、环境监测等领域都有广泛应用。
当待测靶标的数量很少,丰度很低,又不易扩增时,往往需要使用超敏生物及化学传感器。
为了检测到这些数量很少的靶标,往往需要设计更灵敏的传感界面。除此之外,另外一个关键问题是传质问题,也就是说,传感界面与待测物在检测过程中可能根本没有发生相互作用,因而也不可能有诸如抗体捕获这样的过程出现。
发明内容
针对目前大部分提升生化传感器灵敏度的相关技术主要聚焦在如何优化传感器本身的设计上,而对于传质的关注不足等问题,本发明提供一种相变诱导靶标富集的方法:基于界面动力学基本原理,利用相变过程中溶质的不均匀扩散的现象,使得两相交界面附近的待测物质的浓度大幅度提高,形成局部高丰度区域,并以此为原理,在基本不改变生化传感器原有设计的情况下,大幅度改进其灵敏度。
本发明把基于这一思路的生物及化学传感技术命名为:基于相变诱导的靶标富集技术 (Phase-Transition Induced Target Enrichment,或P-TITE)。
本发明所采用的技术方案:
一种相变诱导靶标富集的方法,在进行生物或化学传感检测的过程中,通过传感体系的相变过程把低丰度靶标富集到传感界面形成具有局部较高浓度的靶标区域从而提高检测的灵敏度。
所述的传感界面包括金属或非金属介质表面。
所述的传感界面包括金纳米颗粒的表界面。
所述的靶标包括核酸(DNA、RNA)、多糖、蛋白质。
所述的相变过程为将传感体系于-20℃以下低温冷冻,冷冻完全后在室温下解冻。
本发明的有益效果
通过传感界面附近的靶标富集产生信号放大,将大幅度提高现有传感方法的检测灵敏度。
附图说明
图1为本发明所提出的靶标富集效果示意图;
图2为一个实例中相变诱导DNA在金纳米球表面富集的定量结果。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。
本发明包括以下步骤:在进行传感检测的过程中,通过传感体系的相变过程把低丰度靶标富集到传感界面附近,创造出具有局部高浓度的靶标区域来实现超敏检测。具体的,所述传感界面包括电化学传感界面以及各种纳米颗粒(如金纳米颗粒)的表界面等。所述靶标包括溶液中的生物及化学分子,例如(但不仅限于)核酸、多糖、蛋白质等或是在分析科学中具有特殊意义的物质(如抗体,抗原)等等。
以检测病人体液中病毒抗原或抗体的胶体金试纸为例,利用相变诱导靶标富集技术,可较有效地避免在微量待测靶标下,胶体金免疫层析过程中并没有形成纳米金标记的复合物而产生的漏检。所述的相变诱导富集过程,可以但不仅限于冷冻使溶液结冰,然后解冻这一过程来实现。
实施例1 相变诱导DNA在金纳米球表面富集
针对纳米金颗粒的表面,采用传统的柠檬酸钠还原法,合成直径在15nm的金纳米球并将其浓缩至10 nmol/L,分别向100μL 金纳米球溶液中加入1μL、2μL、4μL、6μL、8μL 100μmol/L的DNA溶液。在本例中所采用的的DNA序列为AAAAAAAAAAAAAAATTTTTATGATGTTCGTTGTG-FAM,其中,poly A片段会对金纳米颗粒表面产生一定的吸附,从而使得金纳米球能够富集DNA在其表面,FAM则是后续用于荧光定量的荧光基团。超声混合后,将混合液放入冰箱-20℃冷冻两小时。冷冻之前也可加入防止金颗粒团聚的溶液(如PEG水溶液)。待溶液冷冻完全后,在室温下解冻,用PBS溶液重新悬浮三次即得到表面捕获DNA的金纳米球(相变诱导方法,如图1所示)。
作为比较,用标准的pH3方法促进金纳米球与DNA的结合,向DNA和金纳米球的混合溶液中加入盐酸缓冲液调节混合溶液的pH为3,室温孵育半小时后,用PBS溶液重悬三次即得到表面捕获DNA的金纳米球(pH3方法)。pH3方法的原理在于利用酸性溶液环境中的电荷作用在金纳米球表面富集DNA,在与相变诱导方法相同的中性pH条件下,金纳米球表面DNA会更稀少。在PBS重悬液中加入巯基乙醇使巯基乙醇的终浓度达到20mM,在室温下孵育过夜后,巯基乙醇能够取代金纳米球表面的DNA,使得金纳米球发生团聚而溶液变为无色。通过14000rpm离心15min获取上清液并测定其荧光强度。金纳米球表面的DNA浓度可以通过对比上清液中DNA的荧光强度和浓度的标准工作曲线得到,所富集DNA的数目见图2。由于相变原理造成胶体金和核酸的相互作用频率大幅度增加,导致胶体金表面的DNA远超过常规结合DNA的方法,见图2。这表明:P-TITE方法相比pH3方法能够更有效地把这一实验中的靶标(DNA)富集到胶体金附近。
对于后续检测而言,pH视具体检测内容有不同的适宜pH,中性酸性均有,但富集之后的pH改变一般不会影响已经富集的效果。
上述实施例仅以DNA靶标为例,但是对于本领域技术人员来说,在熟悉P-TITE相变诱导的原理后,也同样适用于RNA、多糖、蛋白质等,可以做出多种变形和修改,从而实施本发明。
上述实施例仅以金纳米球的表界面为例,但是对于本领域技术人员来说,在熟悉P-TITE相变诱导的原理后,也同样适用于多种金属或非金属介质表面,可以做出多种变形和修改,从而实施本发明。
上述描述中的实施方案可以进一步组合或者替换,在不脱离本发明设计思想的前提下,本领域中普通技术人员对本发明的技术方案做出的各种变化和改进,均属于本发明的保护范围。本发明的保护范围由所附权利要求书及其任何等同物给出。
Claims (1)
1.一种相变诱导靶标富集的方法,其特征在于:在进行生物或化学传感检测的过程中,通过传感体系的相变过程把低丰度靶标富集到传感界面形成具有局部较高浓度的靶标区域从而提高检测的灵敏度;
所述的传感界面为金纳米颗粒的表界面;
所述的靶标为核酸;
所述的相变过程为将传感体系于-20℃以下低温冷冻,冷冻完全后在室温下解冻。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010091386.7A CN111330311B (zh) | 2020-02-13 | 2020-02-13 | 一种相变诱导靶标富集的方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010091386.7A CN111330311B (zh) | 2020-02-13 | 2020-02-13 | 一种相变诱导靶标富集的方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN111330311A CN111330311A (zh) | 2020-06-26 |
CN111330311B true CN111330311B (zh) | 2021-02-23 |
Family
ID=71173848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202010091386.7A Active CN111330311B (zh) | 2020-02-13 | 2020-02-13 | 一种相变诱导靶标富集的方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN111330311B (zh) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007171209A (ja) * | 2000-11-22 | 2007-07-05 | Molecular Vision Ltd | 検出システム |
CN101672779A (zh) * | 2008-07-29 | 2010-03-17 | 维里德克斯有限责任公司 | 用于在生物样品中进行稀有事件分析的高灵敏度多参数方法 |
WO2011089177A1 (en) * | 2010-01-20 | 2011-07-28 | Dublin City University | A method and apparatus for production of monolithic columns |
CN102967574A (zh) * | 2012-12-11 | 2013-03-13 | 天津工业大学 | 利用纤维填充微柱快速富集检测水中痕量As(V)和Cr(VI)的方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1164607C (zh) * | 2002-05-28 | 2004-09-01 | 湖南大学 | 氨基化硅壳类纳米颗粒材料在核酸富集及纳米传感中的应用 |
US7122640B2 (en) * | 2002-06-10 | 2006-10-17 | Phynexus, Inc. | Open channel solid phase extraction systems and methods |
CN1314961C (zh) * | 2004-12-27 | 2007-05-09 | 天津大学 | 温控式多点实现色谱仪的浓缩色谱方法 |
US9068977B2 (en) * | 2007-03-09 | 2015-06-30 | The Regents Of The University Of Michigan | Non-linear rotation rates of remotely driven particles and uses thereof |
JPWO2011027794A1 (ja) * | 2009-09-01 | 2013-02-04 | 株式会社セルシード | 物質分離用前処理カートリッジ及びそれを利用した前処理方法 |
US20120190131A1 (en) * | 2011-01-21 | 2012-07-26 | Vlad Joseph Novotny | Biosensor Electronics |
US9309282B2 (en) * | 2011-10-19 | 2016-04-12 | Bio-Rad Laboratories, Inc. | Solid phase for mixed-mode chromatographic purification of proteins |
CN102519779B (zh) * | 2011-12-06 | 2013-06-12 | 吉林大学 | 一种对生物样品进行富集和除盐净化处理的方法 |
KR20160021096A (ko) * | 2013-04-19 | 2016-02-24 | 내셔널 유니버시티 오브 싱가포르 | 형광성 카페인 센서와 카페인 검출을 위한 휴대용 키트 및 미세유체공학 디바이스 |
CN105158053B (zh) * | 2015-08-24 | 2017-11-10 | 成都翱宇环保科技有限公司 | 一种针对挥发性有机物的浓缩仪、分析系统及其使用方法 |
-
2020
- 2020-02-13 CN CN202010091386.7A patent/CN111330311B/zh active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007171209A (ja) * | 2000-11-22 | 2007-07-05 | Molecular Vision Ltd | 検出システム |
CN101672779A (zh) * | 2008-07-29 | 2010-03-17 | 维里德克斯有限责任公司 | 用于在生物样品中进行稀有事件分析的高灵敏度多参数方法 |
WO2011089177A1 (en) * | 2010-01-20 | 2011-07-28 | Dublin City University | A method and apparatus for production of monolithic columns |
CN102967574A (zh) * | 2012-12-11 | 2013-03-13 | 天津工业大学 | 利用纤维填充微柱快速富集检测水中痕量As(V)和Cr(VI)的方法 |
Also Published As
Publication number | Publication date |
---|---|
CN111330311A (zh) | 2020-06-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Oh et al. | A fluorophore‐based bio‐barcode amplification assay for proteins | |
Wang et al. | An ultrasensitive biosensor for colorimetric detection of Salmonella in large-volume sample using magnetic grid separation and platinum loaded zeolitic imidazolate Framework-8 nanocatalysts | |
US20090215157A1 (en) | Methods for pathogen detection | |
Giri et al. | Signal amplification strategies for microfluidic immunoassays | |
EP3291916B1 (en) | Particle based immunoassay with alternating current electrokinetics | |
Feng et al. | Dual selective sensor for exosomes in serum using magnetic imprinted polymer isolation sandwiched with aptamer/graphene oxide based FRET fluorescent ignition | |
US20080181821A1 (en) | Microfluidic chips for allergen detection | |
US20200363406A1 (en) | Highly-specific assays | |
Xiao et al. | Advances in magnetic nanoparticles for the separation of foodborne pathogens: Recognition, separation strategy, and application | |
HU225636B1 (en) | Method for detecting analyte(s) in fluid | |
US8617903B2 (en) | Methods for allergen detection | |
US20080085508A1 (en) | Non-nucleic acid based biobarcode assay for detection of biological materials | |
US20080181820A1 (en) | Systems for allergen detection | |
Tangchaikeeree et al. | Magnetic particles for in vitro molecular diagnosis: From sample preparation to integration into microsystems | |
US20080241910A1 (en) | Devices for pathogen detection | |
Yang et al. | Emerging techniques for ultrasensitive protein analysis | |
Nevídalová et al. | Capillary electrophoresis–based immunoassay and aptamer assay: A review | |
Gao et al. | Rolling circle amplification integrated with suspension bead array for ultrasensitive multiplex immunodetection of tumor markers | |
Zhao et al. | A fluorescence polarization assay for nucleic acid based on the amplification of hybridization chain reaction and nanoparticles | |
Liu et al. | A graphene oxide and exonuclease-aided amplification immuno-sensor for antigen detection | |
US20080241909A1 (en) | Microfluidic chips for pathogen detection | |
US20100055803A1 (en) | Method and apparatus for detecting molecules | |
US20080180259A1 (en) | Devices for allergen detection | |
Sepehri et al. | Homogeneous differential magnetic assay | |
CN111330311B (zh) | 一种相变诱导靶标富集的方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |