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生物相容性量子點(diǎn)的表征及其在細(xì)胞標(biāo)記中的應(yīng)用
摘要:利用無機(jī)低溫水相合成法制備表面包覆L-半胱氨酸的CdTe/ZnTe核殼型量子點(diǎn),測量不同溶液以及激發(fā)功率激光作用下該量子點(diǎn)的光譜特性.結(jié)果表明,該量子點(diǎn)吸收譜和熒光光譜峰值位置不隨pH值變化,而熒光光強(qiáng)隨pH值升高呈近似線性.卜升趨勢;不同緩沖液對(duì)該量子點(diǎn)熒光光強(qiáng)無影響,但隨孵育時(shí)間延長,熒光強(qiáng)度略有下降;在強(qiáng)激光照射下QDs會(huì)被快速光漂白,選擇適當(dāng)?shù)募す夤β?<100 μW),可降低漂白速率,實(shí)現(xiàn)長時(shí)間穩(wěn)定測量.因此,該量子點(diǎn)具有較好的生物穩(wěn)定性和光穩(wěn)定性,將其與血鐵蛋白相連形成靶向共軛納米粒,可成功用于HeLa細(xì)胞標(biāo)記.細(xì)胞內(nèi)量子點(diǎn)光漂白實(shí)驗(yàn)表明,細(xì)胞微環(huán)境會(huì)影響量子點(diǎn)的光穩(wěn)定性,加速量子點(diǎn)的光漂白.Abstract:Water-soluble CdTe/ZnTe core-shell quantum dots (QDs) coated with L-cysteine were synthesized in low-temperature aqueous-phase one-pot approach.The authors measured the spectral characteristics of QDs at different pH in various buffer solutions and under different excitation laser powers.The primary results show that the absorption spectra of QDs approximately overlap and the fluorescence spectra peaks have no shift in different pH solution.The fluorescence intensity increased linearly with increasing pH.With the incubation time in borate buffer solution,the fluorescence intensity decreased a little.Under strong power laser,the QDs were photobleached rapidly.However,QDs are strongly anti-photobleaehing under appropriate laser power (<100 μW).Thus,such QDs have good biological stability and optical stability.By conjugating the QDs with transferrin protein and constructing the targeted fluorescent nanoparticles,the authors labelled the HeLa cell successfully.Photobleaching experiments in vivo show that microenvironment inside cells affect the stability and accelerate the photobleaching of QDs. 作者: 劉夏[1]陳丹妮[1]屈軍樂[1]楊堅(jiān)泰[2]羅永祥[2]Roy Indrajit[2]王曉梅[3]林曉潭[3]鐘磊[3]Prasad N Paras[2]許改霞[1]牛憨笨[1] Author: LIU Xia[1] CHEN Dan-ni[1] QU Jun-le[1] YANG Jian-tai[2] LUO Yong-xiang[2] Roy Indrajit[2] WANG Xiao-mei[3] LIN Xiao-tan[3] ZHONG Lei[3] Prasad N Paras[2] XU Gai-xia[1] NIU Han-ben[1] 作者單位: 深圳大學(xué)光電工程學(xué)院,光電子器件與系統(tǒng)(教育部、廣東省)重點(diǎn)實(shí)驗(yàn)室,廣東,深圳,518060美國紐約州立大學(xué)布法羅分校,激光光子與生物光子學(xué)研究所,布法羅美國,14260-3000深圳大學(xué)醫(yī)學(xué)院,深圳市生物醫(yī)學(xué)工程重點(diǎn)實(shí)驗(yàn)室,廣東,深圳,518060 期 刊: 光譜學(xué)與光譜分析 ISTICEISCIPKU Journal: SPECTROSCOPY AND SPECTRAL ANALYSIS 年,卷(期): 2010, 30(5) 分類號(hào): Q279 TQ132.4 關(guān)鍵詞: CdTe/ZnTe QDs 細(xì)胞標(biāo)記 Keywords: CdTe/ZnTe QDs Cell labeling 機(jī)標(biāo)分類號(hào): R31 O65 機(jī)標(biāo)關(guān)鍵詞: 生物相容性 量子點(diǎn) 表征 細(xì)胞標(biāo)記 Labeling Cell Application Quantum Dots fluorescence intensity different fluorescent nanoparticles fluorescence spectra biological stability 光漂白 absorption spectra 熒光強(qiáng)度 光穩(wěn)定性 buffer solutions incubation time quantum dots 基金項(xiàng)目: 國家自然科學(xué)基金,廣東省高等學(xué)?萍紕(chuàng)新團(tuán)隊(duì)項(xiàng)目,廣東省自然科學(xué)基金【生物相容性量子點(diǎn)的表征及其在細(xì)胞標(biāo)記中的應(yīng)用】相關(guān)文章:
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