Malaysian Journal of Analytical Sciences Vol 24 No 6 (2020): 906 - 917

 

 

 

 

BIO-BASED CONTENT OF OLIGOMERS DERIVED FROM PALM OIL: SAMPLE COMBUSTION AND LIQUID SCINTILLATION COUNTING TECHNIQUE

 

(Kandungan Berasaskan Bio dalam Oligomer daripada Minyak Sawit: Teknik Pembakaran Sampel dan Penghitungan Sintilasi Cecair)

 

Mohd Azmil Mohd Noor*, Tuan Noor Maznee Tuan Ismail, Razmah Ghazali

 

Quality and Environmental Assessment Unit, Advanced Oleochemical Technologies Division,

Malaysian Palm Oil Board, No. 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia

 

*Corresponding author:  mohd.azmil@mpob.gov.my

 

 

Received: 3 July 2020; Accepted: 18 September 2020; Published:  10 December 2020

 

 

Abstract

The bio-based content is defined as the ratio of weight of the bio-based carbon to the total organic carbon in the product. A radiocarbon technique, involving combustion of samples and counting of the resulting ¹⁴C isotope, was applied to quantify the bio-based content of polyols derived from palm oil. The samples were combusted using a sample oxidizer and the carbon dioxide was trapped by a vapor-phase reaction with an amine, forming carbamate, which was then mixed with an appropriate scintillation cocktail. For the liquid scintillation counting, validation of the method was evaluated through recovery, while the quenching effect was corrected by constructing a quench curve. The optimized radiocarbon method was then applied to determine the ¹⁴C activity (counts per minute [CPM] and disintegrations per minute [DPM]) of palm olein and the polyols derived from it. Palm olein were confirmed to have 100% bio-based content while the value for the polyols derived from them ranged from 71 to 96%, depending on the reactants used for ring-opening reaction of the epoxidized palm olein.

 

Keywords:  palm olein polyol, renewable, radiocarbon, carbon dioxide trapping, quench

 

Abstract

Kandungan berasaskan bio ditakrifkan sebagai nisbah berat karbon berasaskan bio dengan jumlah karbon organik di dalam sesuatu produk. Teknik radiokarbon, yang melibatkan pembakaran sampel dan penghitungan isotop ¹⁴C yang dihasilkan, telah digunakan untuk mengukur kandungan berasaskan bio dalam poliol daripada minyak sawit. Sampel dibakar menggunakan pengoksidasi sampel dan karbon dioksida diperangkap dengan amina, membentuk karbamat, yang kemudian dicampurkan dengan koktel sintilasi yang sesuai. Bagi penghitungan sintilasi cecair, ketepatan kaedah dinilai melalui pemulihan, sementara kesan pelindapkejutan dibetulkan dengan membina keluk pelindapkejutan. Kaedah radiokarbon yang dioptimumkan kemudiannya digunakan untuk menentukan aktiviti ¹⁴C (hitungan per minit [CPM] dan disintegrasi per minit [DPM]) olein sawit dan poliol yang berasal daripadanya. Olein sawit disahkan mempunyai 100% kandungan  berasaskan bio manakala poliol sawit berkisar antara 71 hingga 96%, bergantung kepada reaktan yang digunakan untuk tindak balas ke atas olein sawit yang teroksida.

 

Kata kunci:  poliol olein sawit, boleh diperbaharui, radiokarbon, perangkap karbon dioksida, pelindapkejutan

 

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