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<p>This study evaluates the effectiveness of producing deproteinised natural rubber (DPNR) latex from fresh field latex and commercial low-ammonia (LATZ) latex through enzymatic treatments at room temperature and heat-assisted methods, combined with two concentration processes: centrifugation and membrane separation. The study showed that both room temperature and heat-assisted treatments, in combination with either centrifugation or membrane separation, effectively removed proteins, thereby enhancing the purity of the latex. The physicochemical properties of all types of DPNR latex were evaluated, showing total solid content ranging from 61 to 63%, dry rubber content between 60 and 62%, alkalinity from 0.60 to 0.67%, viscosity between 80 and 120 cP, and volatile fatty acid levels from 0.02 to 0.06%. Rheological studies indicated that DPNR latex exhibits shear-thinning behaviour, with lower viscosity at higher shear rates. Viscoelastic evaluations revealed that DPNR latex exhibited predominantly viscous behaviour, with reduced elasticity at higher strain levels. These properties suggest that DPNR latex is comparable to commercial LATZ latex. However, further optimization is needed to enhance the mechanical stability time of the latex for industrial applications.</p>

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Colloidal properties of deproteinised natural rubber latex

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Roslim Ramli,
  • Asrul Mustafa,
  • Shamsul Kamaruddin,
  • Mohamad Akmal Abdul Rahim,
  • Ruslimie Che Ali,
  • Siti Shuhada Shuib,
  • Mohamad Khairul Akmal Amran,
  • Muhammad Afiq Misri,
  • Sajit Anandevan Sunderasan,
  • Fatimah Rubaizah Mohd Rasdi

摘要

This study evaluates the effectiveness of producing deproteinised natural rubber (DPNR) latex from fresh field latex and commercial low-ammonia (LATZ) latex through enzymatic treatments at room temperature and heat-assisted methods, combined with two concentration processes: centrifugation and membrane separation. The study showed that both room temperature and heat-assisted treatments, in combination with either centrifugation or membrane separation, effectively removed proteins, thereby enhancing the purity of the latex. The physicochemical properties of all types of DPNR latex were evaluated, showing total solid content ranging from 61 to 63%, dry rubber content between 60 and 62%, alkalinity from 0.60 to 0.67%, viscosity between 80 and 120 cP, and volatile fatty acid levels from 0.02 to 0.06%. Rheological studies indicated that DPNR latex exhibits shear-thinning behaviour, with lower viscosity at higher shear rates. Viscoelastic evaluations revealed that DPNR latex exhibited predominantly viscous behaviour, with reduced elasticity at higher strain levels. These properties suggest that DPNR latex is comparable to commercial LATZ latex. However, further optimization is needed to enhance the mechanical stability time of the latex for industrial applications.