TWI702399B - 生物探針之連接子 - Google Patents

生物探針之連接子 Download PDF

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TWI702399B
TWI702399B TW108124590A TW108124590A TWI702399B TW I702399 B TWI702399 B TW I702399B TW 108124590 A TW108124590 A TW 108124590A TW 108124590 A TW108124590 A TW 108124590A TW I702399 B TWI702399 B TW I702399B
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李靜雯
陳育哲
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Abstract

一種生物探針之連接子,適用於將生物探針固定在感測器之晶片基板上,包含有,具有碳數6或碳數6以上之SH-(CH)n-NH2、SH-(CH)n-COOH、 SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)大於250 nm時,該連接子於該晶片基板之覆蓋率為40%-80%。本發明另揭露一種生物探針之連接子,包含有,具有碳數6以下之SH-(CH)n-NH2、SH-(CH)n-COOH、SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)小於250 nm時,該連接子於該晶片基板之覆蓋率為65%-100%。本發明對於不同粗糙度基板具有最佳碳鏈長度之連接子與覆蓋率,能大輻增進電化學感測晶片對被檢測目標物的抓取能力。

Description

生物探針之連接子
本發明係有關於一種連接子化合物,特別是有關於一種生物探針之連接子。
在免疫型電化學生物感測器製作上,生物探針在晶片表面的固定數量與晶片的靈敏度有關,而生物探針固定在晶片表面是透過負責連接晶片與生物探針之間的連接子(linker)做嫁接。連接子的一端含有與不同化學試劑或小分子結合的特定官能基,因此如何促進連接子在晶片表面的有效連接覆蓋為製作生物感測器之首要條件。過去在進行連接子連接覆蓋時,多為專注於連接子在基板表面的連接覆蓋達到最大量。然而,實際情況是即使連接子達到最大連接覆蓋量,晶片對被檢測目標物的抓取量並無正相關。
為解決上述問題,因此須要有研發出特定碳鏈長度的連接子配合生物感測晶片表面的粗糙度以及連接子在晶片上的覆蓋率以獲得最多的被檢測目標物的抓取量。
本發明之目的是提供一種生物探針之連接子,具有特定碳鏈長度,可以獲得最多的被檢測目標物的抓取量。
本發明為達成上述目的提供一種生物探針之連接子,適用於將生物探針固定在感測器之晶片基板上,包含有,具有碳數6或碳數6以上之SH-(CH)n-NH2、SH-(CH)n-COOH、 SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)大於250 nm時,該連接子於該晶片基板之覆蓋率為40%-80%。
本發明另提供一種生物探針之連接子,適用於將生物探針固定在感測器之晶片基板上,包含有,具有碳數6以下之SH-(CH)n-NH2、SH-(CH)n-COOH、SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)小於250 nm時,該連接子於該晶片基板之覆蓋率為65%-100%。
與習知之生物探針之連接子比較,本發明具有以下優點,本發明對於不同粗糙度基板具有最佳碳鏈長度之連接子與覆蓋率,能大輻增進電化學感測晶片對被檢測目標物的抓取能力。
本發明揭露一種生物探針之連接子,其可以大輻增進電化學感測晶片對被檢測目標物的抓取能力。
實施例1:
本發明實施例1之生物探針之連接子(Linker),適用於將生物探針固定在感測器之晶片基板上,包含有,具有碳數6或碳數6以上之SH-(CH)n-NH2、SH-(CH)n-COOH、 SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)大於250 nm時,該連接子於該晶片基板之覆蓋率為40%-80%,覆蓋率最佳為50%-70%。
本發明之感測器之晶片基板之材料是矽、玻璃、石墨烯、金、白金或高分子。選用金或白金材質之晶片基板,適用酸洗製程進行粗糙化處理,酸洗溶液可以使用1份98wt%硫酸與3份33wt%雙氧水的比例進行表面處理,藉由不同的處理時間獲得特定的粗糙度。選用其他玻璃、陶瓷或高分子材質之晶片基板可以使用機械研磨、化學藥劑蝕刻或化學機械研磨來進行粗糙化處理。
經過粗糙化後的晶片基板係浸泡在溶於99.8wt%無水酒精的連接子溶液內且放置於室溫對該晶片基板表面進行修飾,再使用1-乙基-3-(3-二甲基氨基丙基)碳醯二亞胺(EDC)或N-羥基琥珀醯亞胺(NHS)對修飾後的該晶片基板表面進行官能基活化反應。後續,可以使用電化學方法量測晶片基板表面氧化還原特性的變化,進一步由電流密度變化計算修飾分子的覆蓋率。
本發明之生物探針係為酵素、蛋白質、去氧核糖核酸(Deoxyribonucleic acid,DNA)與核糖核酸(Ribonucleic acid,RNA)或齒舌蘭輪斑病毒抗體(ORSV antibody)之生物探針。
實施例2:
本發明實施例2之生物探針之連接子(Linker),適用於將生物探針固定在感測器之晶片基板上,包含有,具有碳數6以下之SH-(CH)n-NH2、SH-(CH)n-COOH、 SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n 是大於1的整數。其中,當該晶片基板之表面平均粗糙度(Ra)小於250 nm時,該連接子於該晶片基板之覆蓋率為65%-100%,覆蓋率最佳為80%-100%。
本發明實施例2之其他技術內容與實施例1相同,包括晶片基板之材料;晶片基板之表面粗糙化處理;連接子溶液修飾;以及晶片基板表面進行官能基活化反應。還有,所適用的生物探針種類亦相同。
本發明生物探針之連接子之實測數據:
本發明實際以純金為基板,使用酸洗對基板表面做粗糙度變化,接著在其表面修飾一端為硫醇基(-SH)、一端為羧基(-COOH)的不同碳鏈長度之C 3H 6O 2, 3-巰基丙酸3-MPA (3-Mercaptopropionic acid, MPA)以及C 11H 22O 2S, 11-巰基十一烷酸 11-MUA(11-Mercaptoundecanoic acid)作為連接子用以將生物探針齒舌蘭輪斑病毒抗體(Odontoglossum ringspot virus antibody, ORSV antibody)固定於表面,以利抓取後續目標物齒舌蘭輪斑病毒(ORSV病毒)作為實際例子並且量測數據。
使用98wt%硫酸與33wt%雙氧水以1:3的比例對於金基板(Au Substrate)表面進行處理,藉由處理時間的不同產生粗糙度的變化,使用原子力顯微鏡AFM(atomic force microscopy)分析金基板表面粗糙度。如第1圖所示,未處理(處理前)之 表面平均粗糙度(Ra) 1.6 nm,相對高度 (Z range) 11.7nm。如第2圖所示,酸洗處理20分鐘後之表面平均粗糙度(Ra) 3.56 nm,相對高度 (Z range) 57.7nm。
將粗糙化後的金基板浸泡在溶於99.8wt%無水酒精的3-巰基丙酸 (3-MPA)與11-巰基十一烷酸 (11-MUA)溶液內且放置於室溫對金基板表面進行修飾,再使用1-乙基-3-(3-二甲基氨基丙基)碳醯二亞胺(EDC)或N-羥基琥珀醯亞胺(NHS)對修飾後的該晶片基板表面進行官能基活化反應,如第3圖所示。
酸洗處理20分鐘後,再以MPA修飾後使用原子力顯微鏡分析金基板表面粗糙度。如第4圖所示,表面平均粗糙度(Ra) 1.78 nm,相對高度 (Z range) 26.1 nm。酸洗處理20分鐘後,再以MUA修飾後使用原子力顯微鏡分析金基板表面粗糙度。如第5圖所示,表面平均粗糙度(Ra) 1.43 nm,相對高度 (Z range) 18.7 nm。
後續,使用電化學方法量測晶片基板表面氧化還原特性的變化,進一步由電流密度變化計算連接子(修飾分子)的覆蓋率。如第6圖所示,3-MPA和11-MUA皆會填補金基板表面的粗糙度,而由活性面積反應得知11-MUA的覆蓋率約94.7%,3-MPA覆蓋率約20%。
將生物探針齒舌蘭輪斑病毒抗體(Odontoglossum ringspot virus antibody, ORSV antibody)溶解於緩衝液中並將其滴在表面修飾活化後的MPA和MUA,使生物探針ORSV 抗體與連接子末端形成胜肽鍵(-CO-NH-)進而固定在金基板(Au Substrate)表面,接著將相同濃度的ORSV病毒溶液與抗體連接覆蓋,如第7圖所示。
最後以掃描電子顯微鏡分析SEM分析金基板表面的ORSV病毒抓取量,結果如第8圖至第9圖所示,覆蓋率小於80%的碳數6以下之短碳鏈3-MPA連接子其對ORSV病毒的抓取量(第8圖)少於覆蓋率大於80%的連接子對ORSV病毒的抓取量(第9圖),亦即碳數6以下之連接子,覆蓋率愈大對於ORSV病毒的抓取量愈多。在長碳鏈11-MUA連接子覆蓋率大於80%對ORSV病毒的抓取量>80%的結果如第10圖所示,長碳鏈的覆蓋率愈大並不會增多ORSV病毒的抓取量。
第1圖至第2圖為原子力顯微鏡AFM分析金基板表面粗糙度。 第3圖為對修飾後的晶片基板表面進行官能基活化反應的示意圖。 第4圖至第5圖為修飾後使用原子力顯微鏡分析金基板表面粗糙度。 第6圖為本發明之連接子的覆蓋率。 第7圖為生物探針與連接子末端形成胜肽鍵(-CO-NH-)進而固定在金基板(Au Substrate)表面的示意圖。 第8圖至第9圖為3-MPA連接子對ORSV病毒的抓取量之掃描電子顯微鏡分析照片。 第10圖為11-MUA連接子對ORSV病毒的抓取量之掃描電子顯微鏡分析照片。
Figure 108124590-A0305-02-0003-1

Claims (5)

  1. 一種生物探針之連接子(Linker),適用於將生物探針固定在感測器之晶片基板上,包含有:具有碳數6或碳數6以上之SH-(CH)n-NH2、SH-(CH)n-COOH、SH-(CH)n-SH、(OH)m-(CH)n-COOH或(OH)m-(CH)n-NH2,m、n是大於1的整數;其中,當該晶片基板之表面平均粗糙度(Ra)大於250nm時,該連接子於該晶片基板之覆蓋率為40%-80%。
  2. 如請求項1所述之生物探針之連接子,其中,該感測器之晶片基板之材料是矽、玻璃、石墨烯、金、白金或高分子。
  3. 如請求項1所述之生物探針之連接子,其中,該晶片基板係使用1份98wt%硫酸與3份33wt%雙氧水的比例進行表面處理,藉由不同的處理時間獲得特定的粗糙度。
  4. 如請求項1所述之生物探針之連接子,更包含將該晶片基板係浸泡在溶於99.8wt%無水酒精的連接子溶液內且放置於室溫對該晶片基板表面進行修飾,再使用1-乙基-3-(3-二甲基氨基丙基)碳醯二亞胺(EDC)或N-羥基琥珀醯亞胺(NHS)對修飾後的該晶片基板表面進行官能基活化反應。
  5. 如請求項1所述之生物探針之連接子,其中,該生物探針為酵素、蛋白質、去氧核糖核酸(Deoxyribonucleic acid,DNA)與核糖核酸(Ribonucleic acid,RNA)或齒舌蘭輪斑病毒抗體(ORSV antibody)之生物探針。
TW108124590A 2019-07-12 2019-07-12 生物探針之連接子 TWI702399B (zh)

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CN114660139A (zh) * 2020-12-23 2022-06-24 昇阳国际半导体股份有限公司 生物探针的连接子

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CN114660139A (zh) * 2020-12-23 2022-06-24 昇阳国际半导体股份有限公司 生物探针的连接子

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