Browsing Irwana Nainggolan, Dr. by Author "Khairel Rafezi, Ahmad, Dr."

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    • Chitosan pH Sensor 

      Irwana, Nainggolan, Dr.; Khairel Rafezi, Ahmad, Dr.; Ainnie Shakirah, Arif (Malaysian Invention and Design Society (MINDS), 2010-05-14)
      Chitosan is a natural biomaterial derived from the alkaline deacetylation of chitin that is present in many crustaceans, insects and mollusk shells. In this work, chitosan solution was deposited on a substrate using ...

    • The sensing mechanism and detection of low concentration acetone using chitosan-based sensors 

      Tulus Ikhsan, Nasution; Irwana, Nainggolan, Dr.; Sabar Derita, Hutagalung, Dr.; Khairel Rafezi, Ahmad, Dr.; Zainal Arifin, Ahmad (Elsevier B. V., 2013)
      This paper aims to discuss the usage of chitosan film sensors to detect acetone concentrations in human breath, in order to precisely diagnose diabetes mellitus in patients. Acetone concentration in the breath varies from ...