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- Reference : AOAC 984.13 Protein (Crude) in Animal Feed and Pet Food
- Tested with VELP Scientifica DKL 20 Automatic Kjeldahl Digestion Unit
  (Code S30100210) and UDK 159 Automatic Kjeldahl Distillation & Titration System
  (Code F30200150).



Introduction

¼Ò, µÅÁö »ç·á¿¡¼­ AAFCO ÀÎÁõ ¸¶Å©´Â Association of American Feed Control Officials ÀÇ ¾àÀÚ·Î ¾ÈÁ¤ÀûÀÌ°í ±ÕÇüÀâÈù ¿µ¾ç¼Ò¸¦ ÇÔÀ¯ÇÑ »ç·áÀÓÀ» ¶æÇÑ´Ù. ±× Áß ´Ü¹éÁú ÇÔ·®Àº °¡ÃàÀÇ °¡½ÄºÎ¸¦ Áõ°¡½ÃÄÑ »ý»ê¼ºÀ» ³ôÀ̹ǷΠ»ç·áÀÇ °¡°ÝÀ» Ã¥Á¤ÇÒ ¶§ ´Ü¹éÁú ÇÔ·®ÀÌ Áß¿äÇÏ°Ô °í·ÁµÇ¾îÁø´Ù

ų´Þ (Kjeldahl) ´Ü¹éÁú ÇÔ·® ºÐ¼®¹ýÀº ½ÄÇ° ¹× »ç·á »ê¾÷¿¡¼­ ´Ü¹éÁú ÇÔ·® ºÐ¼®¿¡ °¡Àå ¸¹ÀÌ »ç¿ëµÇ´Â ºÐ¼® ¹æ¹ýÀ̸ç, AOAC, EPA, DIN e ISO ¿¡ µû¶ó ±¹Á¦ÀûÀ¸·Î ÀÎÁõµÇ¾ú´Ù.

ų´Þ ´Ü¹éÁú ÇÔ·® ºÐ¼®¹ýÀº »ùÇÿ¡ Ȳ»êÀ» ³Ö°í 400 ¡É ÀÌ»óÀÇ °í¿Â¿¡¼­ °¡¿­ÇÏ¿© »ùÇÿ¡ À¯±âÀûÀ¸·Î °áÇյǾî ÀÖ´ø Áú¼Ò¸¦ Ȳ»ê¾Ï¸ð´½¿°À¸·Î º¯È¯ÇÏ´Â ´Ü°è¿¡¼­ºÎÅÍ ½ÃÀÛÇÑ´Ù (1. Digestion, ºÐÇØ ´Ü°è). Ȳ»ê¾Ï¸ð´½¿°¿¡ ¾ËÄ®¸®¿ë¾×À» ÷°¡Çϸé Áú¼Ò°¡ ¾Ï¸ð´Ï¾Æ °¡½º·Î¼­ À¯¸®µÇ¾î ºØ»êÀ¸·Î Æ÷ÁýµÇ°í (2. Distillation, Áõ·ù ´Ü°è), ÀÌ·¯ÇÑ ¾Ï¸ð´½¿°ÀÌ Æ÷ÁýµÈ ¿ë¾×À» ¿°»ê ȤÀº Ȳ»ê Ç¥ÁØ ¿ë¾×À¸·Î ÀûÁ¤ÇÏ¿© Áú¼ÒÀÇ ÇÔ·®À» °è»êÇÑ´Ù (3. Titration, ÀûÁ¤ ´Ü°è).



±×·¯³ª 1. Digestion, ºÐÇØ ´Ü°è¿¡¼­ ´Ù·®ÀÇ »ê¼º À¯µ¶°¡½º°¡ ¹ß»ýÇÏ°í, 2. Digestion, Áõ·ù ´Ü°è¿¡¼­ º¹ÀâÇÑ ½ÃÇè¹ýÀ¸·Î ÀÎÇØ »ç¿ëÀÚ¿¡ µû¶ó ¿ÀÂ÷°¡ ¹ß»ýÇϱ⠽±°í, 3. Titration, ÀûÁ¤ ´Ü°è¿¡¼­ ¾òÀº °á°ú¸¦ º°µµ·Î °è»êÇÏ¿© ´Ü¹éÁú °ªÀ¸·Î ȯ»êÇØ¾ß ÇÏ´Â ´ÜÁ¡ÀÌ ÀÖ´Ù.

VELP »ç ų´Þ ´Ü¹éÁú ÇÔ·® ºÐ¼® Àåºñ´Â À§ ´ÜÁ¡À» ÇØ°áÇÏ¿© ½±°í, ¾ÈÀüÇÏ°í, ½Å·Ú¼º ÀÖ´Â ½ÇÇèÀ» °¡´ÉÄÉÇÑ´Ù.

ÀÌ ½ÃÇè¿¡¼­´Â VELP DKL 20 Automatic Kjeldahl Digestion Unit (Code S30100210), UDK 159 Automatic Kjeldahl Analyzer ·Î »ç·áÀÇ ´Ü¹éÁú ÇÔ·®À» È®ÀÎÇÏ¿´´Ù.

Sample

- ȍᇠ1, Rapeseed cake (indicative protein content : 31.5%)
- ȍᇠ2, Rapeseed cake 2 (indicative protein content : 30%)
- ȍᇠ3, Corn feed (indicative protein content : 6.5%)
- ȍᇠ4, Corn gluten (indicative protein content : 61%)
- ȍᇠ5, Soya cake (indicative protein content : 43%)
- »ç·á 6, Potato¡¯s proteins (indicative protein content : 73%)

Digestion process

- weighing boat (code CM0486000) ¿¡ 1 mm Å©±â·Î ±ÕÁúÈ­ÇÑ »ùÇà ¾à 0.5 ~ 1 g À» 0.1 mg
  ´ÜÀ§·Î Á¤È®È÷ Áß·®À» ÃøÁ¤ÇÏ¿© ´ã°í ½ÃÇè°ü¿¡ ³Ö´Â´Ù
- ´ÙÀ½À» »ùÇÃÀÌ ´ã±ä ½ÃÇè°ü¿¡ ÇÔ²² ³Ö´Â´Ù
  * 2 catalyst tablet (code CT0006650; 3.5 g K2SO4, 0.1 g Cu)
  * 2 antifoam tablets (Code CT0006600)
  * 20 mL 96 ~ 98% Ȳ»ê
- Blank ½ÃÇè¿ë ½ÃÇè°ü (»ùÇÃÀ» Á¦¿ÜÇÑ ³ª¸ÓÁö ¹°ÁúÀ» ³ÖÀº ½ÃÇè°ü) À» ÁغñÇÑ´Ù.
- Digestion UnitÀ» Fume Neutralization System (SMS Scrubber code F307C0199) ¹×
  Aspiration Pump (JP code F30620198) ¿¡ ¿¬°áÇÏ¿© ºÐÇØ ½ÃÀÛ Àü ¹Ì¸® ÆßÇÁ¸¦ ÀÛµ¿½ÃÄÑ
  µÐ´Ù.
- Àåºñ¿¡ ³»ÀçµÈ ÇÁ·Î±×·¥ 7¹ø ¹æ¹ý (420 oC, 60 min) À» ¼±ÅÃÇÏ°í ºÐÇظ¦ ½ÃÀÛÇÑ´Ù.
- ºÐÇØ°¡ ¿Ï·áµÇ¸é ½ÃÇè°üÀÌ ÀÚµ¿À¸·Î »ó½ÂÇÏ¿© °ø±âÁß¿¡ ³Ã°¢ÀÌ ½ÃÀ۵ȴÙ.
  ½ÃÇè°üÀÇ ¿Âµµ°¡ 50~60 oC°¡ µÉ ¶§±îÁö ³Ã°¢ÇÑ´Ù.

Distillation and Titration

- Wash down ±â´ÉÀ» 3 ~ 5ȸ ½ÇÇàÇÏ¿© Àåºñ ³»ºÎ¸¦ ¼¼Ã´ÇÏ°í, Áõ·ù ¹ß»ýÀåÄ¡¸¦ ¿¹¿­ÇÑ´Ù.
- Àåºñ¿¡ ³»ÀçµÈ ÇÁ·Î±×·¥ 7¹ø ¹æ¹ý (¾Æ·¡) À» ¼±ÅÃÇÏ°í Áõ·ù¸¦ ½ÃÀÛÇÑ´Ù.
  * H2O (Èñ¼®¼ö): 50 mL
  * HCl (0.2 N, ÀûÁ¤ ¿ë¾×)
  * NaOH (32 %): 50 mL
  * Áú¼Ò°è¼ö: 6.25
  * H3BO3 (4 %, Áö½Ã¾à Æ÷ÇÔ): 30 mL
- Áõ·ù ¹× ÀûÁ¤ ºÐ¼® ½Ã°£: »ùÇà ´ç ¾à 4ºÐ ¼Ò¿ä

½ÃÇè °á°ú

Áõ·ù ¹× ÀûÁ¤ÀÌ Á¾·áµÇ¸é ´ÙÀ½°ú °°ÀÌ Áú¼Ò ¹× ´Ü¹éÁú¾çÀÌ ÀÚµ¿À¸·Î °è»êµÈ´Ù.



- ÃÑ 6°³ Á¾·ùÀÇ »ç·áÀÇ ´Ü¹éÁú ÇÔ·®Àº Á¦Ç° ¶óº§¿¡ ¸í½ÃµÈ °ª°ú ÀÏÄ¡ÇÏ¿´´Ù.
- autosampler ¸¦ ÀÌ¿ëÇÏ¿© ÃÑ 18°³ ½ÃÇè°üÀ» ÇѹøÀÇ Á¶ÀÛÀ¸·Î Áõ·ùÇÏ°í, ´Ü¹éÁú °ª °è»ê±îÁö
  ÀÚµ¿À¸·Î ÁøÇàÇÒ ¼ö ÀÖ¾ú´Ù.
- ÃÑ 6°³ Á¾·ùÀÇ »ç·á, 18°³¹øÀÇ ½ÃÇè¿¡ ´ëÇÑ »ó´ëÇ¥ÁØÆíÂ÷°¡ ¸ðµÎ 1% ¹Ì¸¸À¸·Î È®ÀεǾî ÀçÇö¼º
  ÀÖ´Â °á°úÀÓÀ» ¾Ë ¼ö ÀÖ´Ù.
- Verification test : Àåºñ ¼º´ÉÅ×½ºÆ®¸¦ À§ÇØ 5 mL ¿¡ 28 mg ÀÇ Áú¼Ò¸¦ ÇÔÀ¯ÇÏ´Â ½Ã¾àÀ¸·Î
  ¾Ë·ÁÁø 3% glycine standard solution À» ºÐ¼®ÇÏ¿´´Ù. ±× °á°ú, 98 ~ 102% »çÀÌÀÇ recovery
  ¹üÀ§ ³» °ªÀ» È®ÀÎÇÏ¿´°í, ÀÌ´Â Àåºñ ¼º´ÉÀÌ À¯ÁöµÈ ä ºÐ¼®ÀÌ ÁøÇàµÇ¾úÀ½À» ÀǹÌÇÑ´Ù.
- »ç·áÀÇ ´Ü¹éÁú ÇÔ·® ºÐ¼®¿¡ DKL 20 ¹× UDK 159 °¡ ÀûÇÕÇÏ¿´´Ù.

VELP »ç DKL ¹× UDK ų´Þ ´Ü¹éÁú ÇÔ·® ºÐ¼® Àåºñ¸¦ »ç¿ëÇÏ¸é ´ÙÀ½ÀÇ ÀÌÁ¡ÀÌ ÀÖ´Ù.

DKL digestion unit
- ÃÖ´ë 450 ¡É ±îÁö ºü¸¥ °¡¿­ ¼Óµµ ±¸Çö
- scrubber ¸¦ ÅëÇØ ºÐÇØ ½Ã ¹ß»ýÇÑ »ê¼º À¯µ¶°¡½ºÀÇ ÁßÈ­
- 54°³ ÇÁ·Î±×·¥ »ç¿ë °¡´É (30 pre-installed + 24 user-programmable)
- ÀÚµ¿ lift Àû¿ë ¸ðµ¨Àº ºÐÇØ Á¾·á Á÷ÈÄ °í¿ÂÀÇ ½ÃÇè°üÀ» ÀÚµ¿À¸·Î »ó½ÂÇÏ¿© ¾ÈÀüÇÏ°í Æí¸®ÇÏ°Ô
  ³Ã°¢ °¡´É

UDK distillation unit
- ÇÁ·Î±×·¡¹ÖÀÌ °¡´ÉÇÏ¿© ½Ã¾àÀÇ ÁÖÀÔ, ÁßÈ­, Áõ·ù, ÀÜ·ù¹° Á¦°Å, ¼¼Ã´ ´Ü°è°¡ ÀÚµ¿À¸·Î ÁøÇàµÈ´Ù.
- Áõ·ù Á¤µµ¸¦ 10~100% ¹üÀ§¿¡¼­ Á¶Àý °¡´É
- 55°³ ÇÁ·Î±×·¥ »ç¿ë °¡´É (31 pre-installed + 24 user-programmable)
- ÀÚµ¿ ÀûÁ¤ ¹× Áú¼Ò/´Ü¹éÁú·® ÀÚµ¿ °è»ê
- USB ·Î µ¥ÀÌÅÍ ·Î±ë (Excel file)
- ³ôÀº ¼öÁØÀÇ Á¤¹Ðµµ¿Í ÀçÇö¼º
- ÃÖ´ë »ý»ê¼º ¹× ¿ÏÀü ÀÚµ¿È­
- AOAC method Àû¿ë








 
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