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The Influence of Food Ingestion and Sample Storage on Direct LDL-Cholesterol Measurement by Immunoseparation Method

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ÀÓȯ¼·/Hwan Sub Lim Á¤À縲/¹Ú±¤ÀÏ/±èÁ¤È£/±Ç¿ÀÇå/Jae Lim Chung/Kwang Il Park/Jeong Ho Kirn/Oh Hun Kwon

Abstract

kabstract :
¹è°æ : ÀúºñÁßÁö´Ü¹éÄÝ·¹½ºÅ×·Ñ (LDL-C)Àº °ü»óµ¿¸Æ ÁúȯÀÇ °¡Àå Áß¿äÇÑ À¯¹ßÀÎÀÚ·Î ¾Ë
·ÁÁ® ÀÖ´Ù. ÃÖ±Ù¿¡ ¸é¿ªºÐ¸®¹ý¿¡ ÀÇÇÑ LDL-C Á÷Á¢ ÃøÁ¤ °Ë»ç(DLDL-C)°¡ ¼Ò°³µÇ¾ú°í ÀÌ
°Ë»ç´Â ±Ý½Ä»óŰ¡ ¾Æ´Ñ °æ¿ì¿¡µµ °ËÇÒ ¼ö ÀÖ´Ù´Â ÀåÁ¡ÀÌ ÀÖ´Ù°í ÇÏ¿© º» ¿¬±¸¿¡¼­´Â ½Ä»ç
¹× º¸°ü Á¶°Ç¿¡ ÀÇÇÑ ¿µÇâÀ» ÀçÆò°¡ÇϰíÀÚ ÇÏ¿´´Ù.
¹æ¹ý : Àǰú´ëÇÐ Çлýµé 32¸íÀ» ´ë»óÀ¸·Î ÇÏ¿© ½ÄÀü, ½ÄÈÄ 2½Ã°£, 4½Ã°£¿¡ äÇ÷À» ÇÏ¿© ½Ä
»ç°¡ Á÷Á¢ ÃøÁ¤¹ý¿¡ ¹ÌÄ¡´Â ¿µÇâ¿¡ ´ëÇÏ¿© Á¶»çÇÏ¿´´Ù. ¶ÇÇÑ º¸°ü ¹æ¹ý¿¡ µû¸¥ °ËüÀÇ ¾ÈÁ¤
¼º ¹× LDL-CÀÇ Â÷À̸¦ º¸±â À§ÇÏ¿© °Ëü¿Í Ç×ü ¹ÝÀÀ ÈÄÀÇ ¿©°ú¾×À» äÇ÷ ´çÀϰú 4¡É º¸
°ü 3ÀÏÈÄ, -2O¡É º¸°üÇÏ¿© 7ÀÏÈÄ¿¡ LDL-C¸¦ ÃøÁ¤ÇÏ¿´´Ù. Âü°í¹æ¹ýÀÎ Ãʰí¼Ó¿ø½ÉºÐ¸®¹ý¿¡
ÀÇÇÑ º£Å¸Áö´Ü¹éÁ¤·®°Ë»ç(BQLDL-C)¸¦ ±âÁØÀ¸·Î DLDL-C°ú LDL-C °è»ê¹ýÀ» ºñ±³ÇÏ¿´´Ù.
°á°ú : ¾ÆÄ§ ½Ä»ç ÈÄ 2½Ã°£ ÈÄ¿¡ äÇ÷ÇÑ °ËüÀÇ LDL-C´Â ¾ÆÄ§±Ý½Ä °Ëü¿Í À¯ÀÇÇÑ Â÷ÀÌ
°¡ ¾ø¾ú´Ù. ¹Ý¸é¿¡ Á¡½É ½Ä»ç ÈÄ 2½Ã°£ ¹× 4°£ ÈÄ¿¡ äÇ÷ÇÑ °ËüÀÇ LDL-C´Â 8.6-9.6% Á¤
µµ À¯ÀÇÇÏ°Ô °¨¼ÒÇÏ¿´´Ù. ³ÃÀå(4¡É)º¸´Ù´Â ³Ãµ¿º¸°ü(-20¡É) »óÅ¿¡¼­ º¸°üÇÑ °ËüÀÇ LDL-C
Ä¡ÀÇ º¯È­´Â ´çÀÏ ÃøÁ¤Ä¡¿Í ºñ½ÁÇÑ °á°ú¸¦ º¸¿´´Ù. Ç÷û Áß¼ºÁö¹æÄ¡°¡ 400 mg/dL ÀÌ»óÀÎ
°æ¿ì¿¡ °è»ê¹ý¿¡ ÀÇÇÑ LDL-CÀº ºñÀ² ¿ÀÂ÷ ¹× Ç׽ÿÀÂ÷°¡ Ä¿¼­ ½Å·ÚÇϱâ Èûµç °ÍÀ» ¾Ë ¼ö
ÀÖ¾ú´Ù. ÀÌ¿¡ ºñÇØ ¸é¿ªºÐ¸®¹ýÀÇ »ó°ü°ü°è´Â y=0.909x + 3.3(r=0.869, n=9, x=BQLDL-C,
y=DLDL-C)·Î Á¤È®µµ°¡ ¿ì¼öÇÑ ÆíÀ̾ú´Ù.
°á·Ð : LDL-C °Ë»ç·Î¼­ ¾ÆÄ§ ½Ä»ç 2½Ã°£ ÈÄ¿¡ äÇ÷ÇÑ °Ëü´Â LDL-C °Ëü·Î¼­ ¹Þ¾Æµé¿©
Áú ¼ö ÀÖÀ¸³ª, ¿ÀÈÄÀÇ ½ÄÈÄ °Ëü´Â À¯ÀÇÇÑ °¨¼Ò¸¦ º¸¿© ºÎÀûÀýÇÏ¿´´Ù. ¸é¿ªºÐ¸®¹ý¿¡ ÀÇÇÑ
LDL-C ÃøÁ¤¹ýÀº ƯÈ÷ °íÁß¼ºÁö¹æÇ÷Áõ ȯÀÚ ¹× Áß¼ºÁö¹æ ¹× HDL-CÄ¡°¡ Á¤»óÀÎ °íÄÝ·¹½º
Å×·Ñ È¯ÀÚÀÇ ÃßÀû °Ë»ç¿¡ ÀûÀýÇÑ °Ë»çÀÌ´Ù.
#ÃÊ·Ï#
-Abstract-
Background : Elevated level of low density lipoprotein-cholesterol (LDL-C) is one of
the major risk factors for the development of coronary heart disease. Direct LDL-C
determination method by immunoseparation (DLDL-C) recently developed is claimed not
to be influenced by food ingestion. Were-evaluated the effects of diet and storage
conditions for this method.
Methods : Samples were collected from thirty-two medical college students before and
after meal to study the effects of diet on this method. We compared the difference of
LDL-C of filtered samples between refrigerated and frozen state. We also compared
direct and indirect calculated measurements of LDL-C with ultracentrifugal
beta-quantification (BQLDL-C) method.
Results : Morning 2-hour-postprandial specimen can be acceptable with no minimal
significant bias, but afternoon 2-hour or 4-hour-postprandial specimen cannot be
recommended due to significant negative bias (8.6-9.6%). Storage of filtered samples
showed no significant difference between frozen and refrigerated state. Calculated
LDL-C when triglyceride level is more than 400mg/dL was not reliable due to large
proportional and constant bias. In contrast. DLDL-C showed good accuracy comparing
with BQLDL-C (y=0.909x+3.3, r=0.869, n=9. x=BQLDL-C, y=DLDL-C).
Conclusions: In conclusion, morning two-hour postprandial specimens can be
acceptable for DLDL-C, but afternoon postprandial specimens may not be recommended
due to significant negative bias. DLDL-C seems to be reliable and useful especially for
hypertriglyceridemic patients or follow-up cases of hyperchclesterolemia with normal
triglyceride or HDL-C levels.

Low density lipoprotein cholesterol; lmmunoseparation; Direct LDL-C measurement; Beta-Quantification; Ultracentrifugation; Fasting;

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