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Introduction

Turbidimetry (Źµµ ÃøÁ¤¹ý, ¶Ç´Â Źµµ ¸é¿ªÃøÁ¤¹ý) Àº ÀÓ»ó ¸é¿ª ½Ã¾àÀÇ Áø´Ü¿¡ ³Î¸® »ç¿ëµÇ´Â ¹æ¹ýÀÔ´Ï´Ù. ÃÖ±Ù¿¡´Â PETIA (Particle-enhanced turbidimetric immunoassay, ÀÔÀÚ °­È­ Źµµ ¸é¿ªÃøÁ¤¹ý) °¡ µîÀåÇÏ¿©, Ç׿ø-Ç×ü º¹ÇÕüÀÇ ¼öÁØÀ» ü¾×¿¡¼­ Á¤·®È­ÇÏ´Â ´õ ¾ÈÁ¤ÀûÀÌ°í Á¤È®ÇÑ ¹æ¹ýÀ¸·Î ÁÖ¸ñ¹Þ°í ÀÖ½À´Ï´Ù. ÀÌ ±â¼úÀº ¸é¿ªÀÔÀÚ°¡ Æ÷ÇÔµÈ Áø´Ü ½Ã¾àÀÇ È¥Å¹µµ¸¦ ÃøÁ¤ÇÏ´Â ¹æ½ÄÀ¸·Î, ÀÌ ½Ã¾àÀÌ »ùÇðú È¥ÇյǾúÀ» ¶§ ¸ñÇ¥ ºÐ¼® ¹°Áú (Ç׿ø) ÀÌ Á¸ÀçÇÒ °¡´É¼ºÀ» ŽÁöÇÕ´Ï´Ù.

PETIA¿¡¼­´Â ´ÜÀÏŬ·Ð Ç×ü·Î ÄÚÆÃµÈ Æú¸®½ºÆ¼·» ¶óÅؽº ³ª³ëÀÔÀÚ°¡ Ç׿ø-Ç×ü º¹ÇÕü·Î ³Î¸® »ç¿ëµË´Ï´Ù. ÀÌ·¯ÇÑ ¸é¿ª Áø´Ü ½Ã¾àÀ» °³¹ßÇÒ ¶§ ¶óÅؽº ÀÔÀÚÀÇ ³óµµ, Å©±â, Å©±â ºÐÆ÷´Â ¸Å¿ì Áß¿äÇÑ ÁöÇ¥ÀÔ´Ï´Ù. ÀÌ´Â PETIA Å×½ºÆ®ÀÇ ¹ÝÀÀ¼º°ú ¹Î°¨¼º»Ó ¾Æ´Ï¶ó ½Ã¾àÀÇ ¾ÈÁ¤¼º¿¡µµ Å« ¿µÇâÀ» ¹ÌÄ¡±â ¶§¹®ÀÔ´Ï´Ù.

ÀÌ Application Note ¿¡¼­´Â ¿¬±¸°³¹ß (R&D) ´Ü°è¿¡ ÀÖ´Â ´ÜÀÏŬ·Ð Ç×ü·Î ÄÚÆÃµÈ ¼¼ °¡Áö ¶óÅؽº »ùÇÃÀÇ ÀÔÀÚ Å©±â¿Í Å©±â ºÐÆ÷¸¦ Ư¼ºÈ­ÇÑ °á°ú¸¦ ´Ù·ç°í ÀÖ½À´Ï´Ù.


Experimenta

Bettersize Instruments Ltd. »çÀÇ BeNano 90 ³ª³ëÀÔÀÚ ºÐ¼®±â¸¦ »ç¿ëÇÏ¿´½À´Ï´Ù. ÀÌ Àåºñ´Â 671 nm ÆÄÀåÀÇ ·¹ÀÌÀú¿Í 50 mW Ãâ·ÂÀ» ±¤¿øÀ¸·Î »ç¿ëÇϸç, APD °ËÃâ±â°¡ »ê¶õµÈ ºû ½ÅÈ£¸¦ ¼öÁýÇϱâ À§ÇØ 90¡Æ °¢µµ¿¡ ¼³Á¤µÇ¾î ÀÖ½À´Ï´Ù. ¼¼ °¡Áö ¶óÅؽº º¹ÇÕü°¡ ÃøÁ¤µÇ¾úÀ¸¸ç, ÇØ´ç Á¤º¸´Â ¾Æ·¡¿¡ ³ª¿Í ÀÖ½À´Ï´Ù.

Table 1. Sample information

ÃøÁ¤Àº BeNano 90 ÀÇ ³»Àå ¿Âµµ Á¦¾î ÀåÄ¡¸¦ »ç¿ëÇÏ¿© 25¡ÆC ¿¡¼­ ¼öÇàµÇ¾ú½À´Ï´Ù. °¢ »ùÇÃÀº Å©±âÀÇ Ç¥ÁØ ÆíÂ÷¸¦ ±¸ÇÏ°í °á°úÀÇ ÀçÇö¼ºÀ» Á¶»çÇϱâ À§ÇØ ÃÖ¼Ò ¼¼ ¹ø ÀÌ»ó ÃøÁ¤µÇ¾ú½À´Ï´Ù.


Figure 1. Intensity, RI, and Size Effluent Curves of BSA


Results and Discussion

original scattered light ÀÇ signal À» ºÐ¼®ÇÏ¿© »ùÇÃÀÇ »ó°ü ÇÔ¼ö (correlation function) ¸¦ ±¸ÇÏ¿´À¸¸ç ±× °á°ú´Â ´ÙÀ½°ú °°½À´Ï´Ù.

Figure 1 - 3 Àº ¼¼ °¡Áö »ùÇÃÀÇ »ó°ü ÇÔ¼ö¸¦ º¸¿©ÁÝ´Ï´Ù. ÀÌ¿Í °°ÀÌ, »ó°ü ÇÔ¼ö´Â ³ôÀº ÀçÇö¼ºÀ» ³ªÅ¸³»¸ç, ÀÌ´Â BeNano 90 ÀÇ ±¤ÇÐ ½Ã½ºÅÛÀÌ ¿ì¼öÇÑ ¾ÈÁ¤¼ºÀ» °®Ãß°í ÀÖÀ½À» ÀÔÁõÇÕ´Ï´Ù.


Figure 1. Correlation functions of Sample A


Figure 2. Correlation functions of Sample B


Figure 3. Correlation functions of Sample C

Figure 4 - 6Àº ¼¼ °¡Áö »ùÇÃÀÇ ÀÔÀÚ Å©±â ºÐÆ÷ (PSD, Particle Size Distribution) ¸¦ º¸¿©ÁÝ´Ï´Ù. °¢ »ùÇÃÀÇ PSD´Â ÀÌ·¯ÇÑ ½ÃÇè Á¶°Ç¿¡¼­ ¿ì¼öÇÑ ÀçÇö¼ºÀ» ³ªÅ¸³À´Ï´Ù.


Figure 4. Particle size distributions of Sample A


Figure 5. Particle size distributions of Sample B


Figure 6. Particle size distributions of Sample C

Figure 7 ¿¡¼­ ¼¼ »ùÇÃÀÇ PSD ¸¦ ºñ±³ÇÑ °á°ú, »ùÇà C > »ùÇà A > »ùÇà B ¼øÀ¸·Î Å©±â°¡ Å©¸ç, À̵éÀÇ PSD °¡ ¸íÈ®ÇÏ°Ô ±¸ºÐµÊÀ» ¾Ë ¼ö ÀÖ½À´Ï´Ù.


Figure 7. Particle size distributions of Sample A, B, and C

Table 2 ÀÇ ÃøÁ¤ °á°ú¿¡¼­ ¼¼ »ùÇÃÀÇ Z-Æò±Õ Å©±â°¡ Å©°Ô Â÷À̳²À» È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù.

»ùÇà CÀÇ Å©±â°¡ °¡Àå Å©°í, »ùÇà A°¡ ±×´ÙÀ½À̸ç, »ùÇà B°¡ °¡Àå ÀÛ½À´Ï´Ù.
»ùÇà B¿Í »ùÇà C °£ÀÇ Å©±â Â÷ÀÌ´Â ¾à 4¹èÀÔ´Ï´Ù.

°¢ »ùÇÃÀÇ ÀçÇö¼º¿¡ ´ëÇÑ »ó´ë Ç¥ÁØ ÆíÂ÷ (Relative Standard Deviation) ´Â 1% ¹Ì¸¸À¸·Î ³ªÅ¸³µ½À´Ï´Ù. ¸ðµç »ùÇÃÀÇ ´ÙºÐ»ê¼º Áö¼ö (PDI, Polydispersity Index) °¡ 0.05 ¹Ì¸¸À¸·Î, ÀÌ´Â ¸ðµç »ùÇÃÀÇ ÀÔÀÚ Å©±â ºÐÆ÷°¡ Á¼°í ÀÔÀÚµéÀÌ ´ÜºÐ»êÀÓÀ» ÀǹÌÇÕ´Ï´Ù.


Table 2. Measurement results of Sample A, B, and C








 
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