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Kinetic and thermodynamic characterization of amino acids generation via subcritical water reaction of microalgae Nannochloropsis sp. biomass

  • Nur Hidayah Zainan
  • Mohd Azan Mohammed Sapardi
  • Bernard Chon Han Ho
  • Shamsul Izhar Siajam
  • Siti Mazlina Mustapa Kamal
  • Michael K. Danquah
  • Razif HarunEmail author
Original Article
  • 23 Downloads

Abstract

Emerging applications of amino acids in the development of biopharmaceuticals, functional foods and feeds, and biostimulants in sustainable agriculture have led to increasing interests in the development of commercially-viable technologies for amino acid production. Amongst the many technologies currently used, subcritical water reaction has the potential to offer a scalable and environmentally benign approach to amino acids synthesis. The present work investigates the kinetic and thermodynamic behaviour of amino acids synthesis from Nannochloropsis sp. biomass using subcritical water. Experiments were conducted in a batch reactor at temperatures between 250-280°C for a duration of 5-20 min using 1% (w/v) microalgal loading. The aqueous phase obtained from the reaction was directly analyzed for amino acid concentration. The highest amino acids yield of 0.0196 g AA / g biomass was obtained at 260°C for 20 min, representing 44% of amino acids extracted from the biomass. A single consecutive reaction model used for data validation showed a good agreement between the experimental and theoretical data generated. The results obtained from the kinetic study demonstrated that amino acids could be produced and decomposed rapidly from the subcritical water process. Thermodynamic analysis by transition-state theory showed that the subcritical water process as endothermic, while the Gibbs free energy showed the reaction as non-spontaneous, requiring constant external energy to support it.

Keywords

Subcritical water reaction ° Microalgae ° Reaction kinetic ° Thermodynamic ° Protein ° Amino acids 

Notes

Acknowledgement

This work has been supported by Fundamental Research Grant Scheme (Project Code: 03-01-19-2075FR) and the Department of Chemical and Environmental Engineering, Universiti Putra Malaysia.

Supplementary material

13399_2019_538_MOESM1_ESM.docx (318 kb)
ESM 1 (DOCX 318 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Nur Hidayah Zainan
    • 1
    • 2
  • Mohd Azan Mohammed Sapardi
    • 3
  • Bernard Chon Han Ho
    • 1
  • Shamsul Izhar Siajam
    • 1
  • Siti Mazlina Mustapa Kamal
    • 4
  • Michael K. Danquah
    • 5
  • Razif Harun
    • 1
    Email author
  1. 1.Department of Chemical and Environmental EngineeringUniversiti Putra MalaysiaSerdangMalaysia
  2. 2.Department of Biotechnology EngineeringInternational Islamic University MalaysiaKuala LumpurMalaysia
  3. 3.Department of Mechanical EngineeringInternational Islamic University MalaysiaKuala LumpurMalaysia
  4. 4.Department of Process and Food Engineering, Faculty of EngineeringUniversiti Putra MalaysiaSerdangMalaysia
  5. 5.Department of Chemical EngineeringUniversity of TennesseeChattanoogaUSA

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