ÁõÁ¡Á¦ : ¼¿·ê·Î½º°è CMC


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¼¿·ê·Î½º°è Cellulose   

cellulose
- Æ÷µµ´ç °áÇÕ :  ¾Æ¹Ð·Î½º, ¾Æ¹Ð·ÎÆåƾ
- ¼¿·ê·Î¿À½º¸¦ ºÐÇØÇϱâ Èûµç ÀÌÀ¯
- cellulose gum :  Methyl cellulose

Cellulose        = °ã°ãÀÌ ½×Àα¸Á¶·Î ºñÁý°í µé¾î°¥ Æ´À̾ø´Ù.
Cellulose gum = Side chain À־ ¼öÈ­ °¡´É

- DP : üÀÎ ±æÀÌ¿¡ µþ¶ó

Fat holdout
- Methyl celllulose
- Hydroxypropylcellulose
- Methylhydroxypropylcellulose




Carboxymethyl cellulose (CMC) (cellulose gum) is prepared from cotton linters or wood pulp by soaking the raw material in aqueous sodium hydroxide and then introducing monochloroacetic acid. The result is the introduction of carboxymethyl ether groups where there had been hydroxyl groups previously. The reacted cellulose is then purified, washed, and dried.
Methylcellulose (MC) and methylhydroxypropylcellulose (MHPC) are prepared in a manner similar to that of CMC, except that the reagents used are methyl chloride for MC and a mixture of methyl chloride and propylene oxide for MHPC. Hydroxypropylcellulose (HPC) is also prepared in a similar manner, except that the reagent used is propylene oxide.

while CMC is anionic (and is sold in the sodium salt form), the other three cellulose-based hydrocolloids (MC, HPC, and MHPC) are non-ionic. In practical terms, this makes MC, HPC, and MHPC relatively insensitive to electrolytes, while the viscosity of CMC decreases dramatically if it is not hydrated in water prior to exposure to ionic substances such as salts and acids.

As a class, the cellulose derivative hydrocolloids are optically transparent in solution, while most other gums are not. They make pseudoplastic solutions (i.e., exhibit instantaneous and reversible shear thinning behavior), provided that the substitution is evenly distributed along the molecule. Where they differ
is in the way they respond to increases in solution temperature. A CMC solution thins when heated and thickens again when cooled, which is typical behavior for most gums. MC and MHPC solutions gel if heated to their incipient gelation temperature (IGT) and revert to the liquid state upon cooling. An HPC
solution precipitates if heated to its cloud point but redissolves when cooled to room temperature. These three very different behaviors result from the differences in the type of substitutions linked on the cellulose backbone. In MC, HPC, and MHPC, the DS controls when the IGT or cloud point occurs and the ultimate gel strength. Generally, as the hydroxypropyl DS increases, the IGT increases while the gel strength decreases (softer gel). The IGT is usually
50–90¡ÆC (122–194¡ÆF). If MC and MHPC are heated sufficiently beyond the IGT, they precipitate just as HPC does. HPC does not have a ¡°gelled¡±
state like MC and MHPC. It goes from hydrated to precipitated when its solution temperature is raised sufficiently. As the DS of CMC increases, the tolerance to electrolytes increases and the probability of thixotropic behavior decreases.









ÀÛ³â(2015³â 2¿ù25ÀÏ) ³×ÀÌó(Nature)Áö¿¡ À¯È­Á¦ÀÇ À§Ç輺ÀÌ ¹àÇôÁ³´Ù´Â ³í¹®ÀÌ ¹ßÇ¥µÇ¾ú´Ù. ¹Ì±¹ Á¶Áö¾Æ ÁÖ¸³´ëÇÐ »ýÀÇÇבּ¸¼ÒÀÇ ¾Øµå·ç Áö¿öÃ÷ ¹Ú»ç´Â À¯È­Á¦°¡ Àå¹ÚÅ׸®¾Æ ±¸¼º¿¡ º¯È­¸¦ ÀÏÀ¸ÄÑ ¿°Áõ ÃËÁø ¹ÚÅ׸®¾Æ´Â Áõ°¡½ÃÅ°°í ¿°Áõ ¾ïÁ¦ ¹ÚÅ׸®¾Æ´Â °¨¼Ò½ÃŲ´Ù´Â Áã½ÇÇè °á°ú¸¦ ¹ßÇ¥ÇÑ °ÍÀÌ´Ù. ½ÇÇè¿¡¼­ »ç¿ëÇÑ À¯È­Á¦ÀÎ Æú¸®¼Ò¸£º£ÀÌÆ®-80(polysorbate-80) ¶Ç´Â CMC(carboxymethylcellulose) ¿´´Ù. ½ÇÇè¿¡ µû¸£¸é ÀÌ°ÍÀ» ¼·ÃëÇÑ ÁãµéÀÌ ÁãµéÀÌ ¸ðµÎ Àå¹ÚÅ׸®¾ÆÀÇ ±¸¼º¿¡ º¯È­°¡ ³ªÅ¸³ª¸é¼­ Çöó°Ö¸°(flagelin)°ú ´Ù´çü(lipopolysaccharide)¸¦ ¸¹ÀÌ ¸¸µå´Â ¹ÚÅ׸®¾ÆµéÀÌ Áõ°¡Çß´Ù´Â °ÍÀÌ´Ù

½ÄÇ°¿¡´Â 10ppm ÀÌÇÏ,  0.5ppm ÀÌÇÏ °°ÀÌ ³óµµ¸¦ ±âÁØÀ¸·Î ÇÏ´Â °æ¿ì°¡ ¸¹´Ù. ÀÌ°ÍÀº ÀϹÝÀûÀÎ ½ÄÇ°ÀÇ ¼·Ãë »óȲÀ» °í·ÁÇÏ¿© ³óµµÀÌ´Ù. ±×·±µ¥ ¼·Ãë·®À» °í·ÁÇÏÁö ¾Ê°í ¹«ÀÛÁ¤ ³óµµ¸¦ ±âÁØÀ¸·Î ÇÏ´Â ¾î¸®¼®Àº ½ÇÇèµµ ²Ï ÀÖ´Ù. ¸¸¾à¿¡ »ç¶÷ÀÌ CMC(Carboxymethyl cellulose, ÁõÁ¡Á¦) 1% Á¦Ç°À» ¸ÔÀÎ ½ÇÇèÀ» ÇÏ¿´´Ù¸é. Åë»ó »ç¿ë·®º¸´Ù ¸¹Áö¸¸ ±× ³óµµ¸¦ °¡Áö°í ¹®Á¦¸¦ »ï±â´Â Èûµé´Ù. ±×·±µ¥, 20gÂ¥¸® Áã¿¡°Ô 1% Â¥¸®¸¦ ¸ÅÀÏ 5ml¸¦ ¸ÔÀÌ¸é ¹®Á¦°¡ ¾öû³ª´Ù. ¼ºÀÎ ±âÁØÀ¸·Î ¸ÅÀÏ 150gÀ» ¸ÔÀÎ ¼ÀÀÌ µÇ´Ï±î ¸»ÀÌ´Ù. ÀÌ·± ½ÇÇèÀº µ¶¼ºÀ» ³íÇϱâ Àü¿¡ ½ÇÇèÀÇ ±âº»ÀÌ ¾È µÈ °ÍÀÌ´Ù. ¾î¶°ÇÑ ¼ººÐÀÌ¶óµµ ¸ÅÀÏ 150gÀ» ¸ÔÀδٸé Å»ÀÌ ³ª±â ½¬¿î ¾çÀ̱⠶§¹®ÀÌ´Ù. ±×·±µ¥ ÀÌ·± ½ÇÇèÀÌ °¡Àå ±ÇÀ§ ÀÖ´Ù´Â Nature¿¡ ½Ç¸®±âµµ ÇÏ´Ï ºÒ·®Áö½Ä°úÀÇ ÅõÀïÀº °í´ÜÇÒ ¼ö¹Û¿¡ ¾ø´Ù.






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