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Çѱ¹ÀÚ¿ø½Ä¹°ÇÐȸ / v.23, no.4, 2010³â, pp.386-392
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±ÙÀû¿Ü¼± ºÐ±¤±¤µµ°è¸¦ ÀÌ¿ëÇÑ Â÷ Á¦Ç°ÀÇ »ö»ó ¹× Ä«Å×Ų·ùÀÇ ½Å¼Ó ÃøÁ¤
( Rapid Measure of Color and Catechins Contents in Processed Teas Using NIRS ) |
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| ³ìÂ÷, ºÎºÐ¹ßÈ¿Â÷, ¹ßÈ¿Â÷ ¹× ÈĹßÈ¿Â÷ µî ´Ù¾çÇÑ Â÷ Á¦Ç° ºÐ¸»À» NIRSystem¸¦ ÀÌ¿ëÇÏ¿© Àü ´ë¿ª(400-2500 nm)¿¡¼ ½ºÆåÆ®·³À» ¾ò¾î Áßȸ±ÍºÐ¼®¿¡ ÀÇÇØ »ö»ó °ü·Ã Ư¼º ¹× Ä«Å×Ų·ù ¼ººÐ¿¡ ´ëÇÑ °Ë·®½ÄÀ» À¯µµÇÏ¿´´Ù. Hunter color scale¿¡¼ ¹ßÈ¿Á¤µµÀÇ º¯À̸¦ a/b·Î 98.7% ¼³¸íµÉ ¼ö ÀÖ¾î a/b°ªÀ¸·Î Â÷Á¦Ç°ÀÇ ¹ßÈ¿Á¤µµ¸¦ ÃßÁ¤ÇÒ ¼ö ÀÖ´Ù. MPLS¸¦ ÀÌ¿ëÇÏ¿© ÀÛ¼ºµÈ °Ë·®½ÄÀÇ °á°ú L°ªÀÇ °Ë·®½Ä ÀÛ¼º½Ã °áÁ¤°è¼ö´Â 0.997, a°ªÀÇ °áÁ¤°è¼ö´Â 1.00, b°ªÀÇ °áÁ¤°è¼ö´Â 0.996, a/b°ªÀÇ °áÁ¤°è¼ö´Â 0.999·Î ¸Å¿ì ³ô¾Ò´Ù. MPLS¸¦ ÀÌ¿ëÇÏ¿© ÀÛ¼ºµÈ °Ë·®½ÄÀÇ °á°ú EGC, EC, EGCg, ECg ¹× ÃÑ Ä«Å×ŲÀÇ °áÁ¤°è¼ö´Â °¢°¢ 0.919, 0.896, 0.978, 0.905 ¹× 0.983À¸·Î ¸Å¿ì ³ô¾Ò´Ù. Â÷ Á¦Ç° ºÐ¸»ÀÇ »ö»ó°ü·Ã Ư¼ºµé(L, a, b, a/b) ¹× Ä«Å×Ä£·ù (EGCg, EGC, EC, ECg ¹× ÃÑ Ä«Å×Ų) ÀÇ °Ë·®½Ä Á¤È®µµ°¡ ¸Å¿ì ³ô¾Æ¼ NIRSÀÇ °¡½Ã±¤¼± ´ë¿ª(400~700 nm)¹× ±ÙÀû¿Ü¼± ´ë¿ª(780~2500 nm)¿¡¼ µ¿½Ã¿¡ µÎ Ư¼ºÀÇ ¼ººÐÀ» 1~2ºÐ ³»·Î ÃøÁ¤ÀÌ °¡´ÉÇÏ´Ù. |
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| This study was done to measure the color and catechins contents in processed teas using the whole bands (400~2500 nm) with near-infrared spectroscopy(NIRS). The powder colors of 109 processed teas were measured with a colorimeter. The a/b ratios in Hunter color scale in processed teas accounted for about 98.9% of the variation in the fermentation degree(FD), indicating that the a/b ratio was a very useful trait for assessing fermentation degree. Also tea powders were scanned in the visible bands used with NIRSystem. The calibration equations for powder colors were developed using the regression method of modified partial least squares(MPLS) with the internal cross validation. The equations had low SECV (standard errors of cross-validation), and high $R^2$ (coefficient of determination in calibration) values with 0.996~1.00, indicating that the visible bands(400~700 nm) with NIRS could be used to rapidly measure the variables related to powder color and fermentation degree. Also another powders of 137 processed teas were scanned at 780~2500 nm bands in the reflectance mode. The calibration equations were developed using the regression method of MPLS with the internal cross validation. The equations had low SECV, and high $R^2$ (0.896~0.983) values, showing that NIRS could be used to rapidly discriminate the contents of EGC($R^2$=0.919), EC(0.896), EGCg(0.978), ECg(0.905) and total catechins(0.983) in processed teas with high precision and ease. |
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| Ű¿öµå |
| powder color;fermentation degree;processed teas;visible bands;NIRS;Hunter Lab color scale;catechins; |
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Çѱ¹ÀÚ¿ø½Ä¹°ÇÐȸÁö / v.23, no.4, 2010³â, pp.386-392
Çѱ¹ÀÚ¿ø½Ä¹°ÇÐȸ
ISSN : 1226-3591
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201026064156458)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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