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풀리지 않는 문제, 고민하는 문제를 질문하면 답을 얻으실 수 있습니다.

Dialdehyde cellulose(DAC)의 Aldehyde content 구하는 과정을 알고싶습니다.

안녕하세요.
"Strong, Self-Standing Oxygen Barrier Films from Nanocelluloses Modified with Regioselective Oxidative Treatments" 논문 내용에서 Aldehyde contents와 Oxidized cellulose Anhydroglucose unit(AGU)  를 구하는 방법을 알고 싶습니다. 

아래에 해당 내용과 논문을 첨부했습니다.

답변 부탁드립니다. 감사합니다.

Synthesis of Cellulose Derivatives.
Two-step reactions were used to fabricate periodate-based celluloses. At first, cellulose pulp was oxidized with periodate as previously described.23 In brief, 9.00 g of cellulose was oxidized using 7.38 g of sodium periodate at 55 °C for 3 h in the absence of light. DAC with an aldehyde content of 1.68 mmol/g was obtained (i.e., 14% of the cellulose AGUs were oxidized). The product was stored at 4 °C in a nondried state. Dicarboxylic acid cellulose (DCC) was prepared as reported earlier.14 In brief, 4.50 g of nondried DAC was reacted with 4.53 g of sodium chlorite in a 1 M aqueous solution of acetic acid for 48 h at room temperature.
  • Aldehyde
  • Cellulose
  • Dialdehyde cellulose
  • Periodate oxidations
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답변 2
  • 답변

    김병관님의 답변


    첨부하신 논문에서 Aldehyde contents는 ref. 23을 따라서 진행한 것 같습니다.

    The aldehyde content of DAC was determined by the method described previously. (23) 

    방법이 아주 간단하지는 않은 것 같은데 다음과 같습니다.


    2.3. Determination of the aldehyde content

    The determination of aldehyde contents of DAC was based on oxime reaction between aldehyde group and NH2OH.HCl. The never-dried periodate oxidized cellulose (0.1 g abs.) was placed in a 250 ml beaker containing 1.39 g of NH2OH.HCl dissolved in 100 ml of 0.1 M acetate buffer (pH = 4.5). The beaker was covered with a thin rubber foil and mixture was stirred 48 hour at room temperature with a magnetic stirrer. Product was filtrated and washed with 600 ml of deionized water after which it was dried in a freeze-dryer. Nitrogen content of the oxime derivate of DAC was determined by using a PerkinElmer CHNS/O 2400 Series II elemental analyzer. As illustrated in Scheme 1 as a reaction (2), one mol of aldehyde reacts with one mol of NH2OH.HCl and the aldehyde content can be calculated directly from nitrogen content of the product.


    그리고 Oxidized cellulose Anhydroglucose unit(AGU) 는

     9.00 g of cellulose : 7.38 g of sodium periodate = 1 : 0.62 몰비인 것 같아서 모든 OH가 aldehyde 로 반응가지는 않는 조건인 것 같지만 분자구조그림에서 단위 분자량 162 g/mol으로 계산해보면 aldehyde content of 1.68 mmol/g은 27%로 계산되는데 어떻게 14%가 나왔는지는 모르겠습니다.


    첨부하신 논문에서 Aldehyde contents는 ref. 23을 따라서 진행한 것 같습니다.

    The aldehyde content of DAC was determined by the method described previously. (23) 

    방법이 아주 간단하지는 않은 것 같은데 다음과 같습니다.


    2.3. Determination of the aldehyde content

    The determination of aldehyde contents of DAC was based on oxime reaction between aldehyde group and NH2OH.HCl. The never-dried periodate oxidized cellulose (0.1 g abs.) was placed in a 250 ml beaker containing 1.39 g of NH2OH.HCl dissolved in 100 ml of 0.1 M acetate buffer (pH = 4.5). The beaker was covered with a thin rubber foil and mixture was stirred 48 hour at room temperature with a magnetic stirrer. Product was filtrated and washed with 600 ml of deionized water after which it was dried in a freeze-dryer. Nitrogen content of the oxime derivate of DAC was determined by using a PerkinElmer CHNS/O 2400 Series II elemental analyzer. As illustrated in Scheme 1 as a reaction (2), one mol of aldehyde reacts with one mol of NH2OH.HCl and the aldehyde content can be calculated directly from nitrogen content of the product.


    그리고 Oxidized cellulose Anhydroglucose unit(AGU) 는

     9.00 g of cellulose : 7.38 g of sodium periodate = 1 : 0.62 몰비인 것 같아서 모든 OH가 aldehyde 로 반응가지는 않는 조건인 것 같지만 분자구조그림에서 단위 분자량 162 g/mol으로 계산해보면 aldehyde content of 1.68 mmol/g은 27%로 계산되는데 어떻게 14%가 나왔는지는 모르겠습니다.

    등록된 댓글이 없습니다.

    게시

    비공개 댓글
  • 답변

    김병관님의 답변


    첨부하신 논문에서 Aldehyde contents는 ref. 23을 따라서 진행한 것 같습니다.

    The aldehyde content of DAC was determined by the method described previously. (23) 

    방법이 아주 간단하지는 않은 것 같은데 다음과 같습니다.



    2.3. Determination of the aldehyde content

    The determination of aldehyde contents of DAC was based on oxime reaction between aldehyde group and NH2OH.HCl. The never-dried periodate oxidized cellulose (0.1 g abs.) was placed in a 250 ml beaker containing 1.39 g of NH2OH.HCl dissolved in 100 ml of 0.1 M acetate buffer (pH = 4.5). The beaker was covered with a thin rubber foil and mixture was stirred 48 hour at room temperature with a magnetic stirrer. Product was filtrated and washed with 600 ml of deionized water after which it was dried in a freeze-dryer. Nitrogen content of the oxime derivate of DAC was determined by using a PerkinElmer CHNS/O 2400 Series II elemental analyzer. As illustrated in Scheme 1 as a reaction (2), one mol of aldehyde reacts with one mol of NH2OH.HCl and the aldehyde content can be calculated directly from nitrogen content of the product.



    그리고 Oxidized cellulose Anhydroglucose unit(AGU) 는

     9.00 g of cellulose : 7.38 g of sodium periodate = 1 : 0.62 몰비인 것 같아서 모든 OH가 aldehyde 로 반응가지는 않는 조건인 것 같지만 분자구조그림에서 단위 분자량 162 g/mol으로 계산해보면 aldehyde content of 1.68 mmol/g은 27%로 계산되는데 어떻게 14%가 나왔는지는 모르겠습니다.

    첨부하신 논문에서 Aldehyde contents는 ref. 23을 따라서 진행한 것 같습니다.

    The aldehyde content of DAC was determined by the method described previously. (23) 

    방법이 아주 간단하지는 않은 것 같은데 다음과 같습니다.



    2.3. Determination of the aldehyde content

    The determination of aldehyde contents of DAC was based on oxime reaction between aldehyde group and NH2OH.HCl. The never-dried periodate oxidized cellulose (0.1 g abs.) was placed in a 250 ml beaker containing 1.39 g of NH2OH.HCl dissolved in 100 ml of 0.1 M acetate buffer (pH = 4.5). The beaker was covered with a thin rubber foil and mixture was stirred 48 hour at room temperature with a magnetic stirrer. Product was filtrated and washed with 600 ml of deionized water after which it was dried in a freeze-dryer. Nitrogen content of the oxime derivate of DAC was determined by using a PerkinElmer CHNS/O 2400 Series II elemental analyzer. As illustrated in Scheme 1 as a reaction (2), one mol of aldehyde reacts with one mol of NH2OH.HCl and the aldehyde content can be calculated directly from nitrogen content of the product.



    그리고 Oxidized cellulose Anhydroglucose unit(AGU) 는

     9.00 g of cellulose : 7.38 g of sodium periodate = 1 : 0.62 몰비인 것 같아서 모든 OH가 aldehyde 로 반응가지는 않는 조건인 것 같지만 분자구조그림에서 단위 분자량 162 g/mol으로 계산해보면 aldehyde content of 1.68 mmol/g은 27%로 계산되는데 어떻게 14%가 나왔는지는 모르겠습니다.
    등록된 댓글이 없습니다.

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