ENHANCING THE OXIDATIVE STABILITY OF BIODIESEL–DIESEL BLENDS USING BETA TRIGYNA WALDST. & KIT. (AMARANTHACEAE) EXTRACT: A DSC STUDY BİYODİZEL–DİZEL KARIŞIMLARININ OKSİDATİF STABİLİTESİNİN BETA TRİGYNA WALDST. & KİT. (AMARANTHACEAE) EKSTRAKTI KULLANILARAK ARTIRILMASI: DSC ÇALIŞMASI

XII. INTERNATIOANAL HEALTH, ENGINEERING AND SCIENCE CONGRESS, Toskent, Uzbekistan, 10 - 12 April 2026, pp.475-482, (Full Text)

Conventional energy sources are progressively becoming incompatible with contemporary environmental sustainability

objectives, leading to an increasing demand for renewable and environmentally friendly alternatives. Biodiesel is widely

recognized as a promising alternative fuel due to its low toxicity, biodegradability, and reduced emissions. However, its high

content of polyunsaturated fatty acids makes it particularly susceptible to oxidative degradation during storage and utilization.

This inherent instability adversely affects fuel storage stability, leading to the formation of undesirable oxidation products that

can compromise engine performance and fuel quality. In this study, the antioxidant capacity of Beta trigyna Waldst. & Kit.

(Amaranthaceae) was investigated in biodiesel–diesel (50:50, v/v) blends. The plant extract was incorporated into the fuel

mixture at a concentration of 3000 ppm and comparatively evaluated against ascorbic acid as a reference antioxidant. The

thermal behavior and oxidative stability of the prepared fuel samples were systematically analyzed using differential scanning

calorimetry (DSC), which provides detailed insights into phase transitions and crystallization characteristics of the fuel matrix.

The DSC results revealed that the addition of B. trigyna extract significantly enhanced the thermal stability of the biodiesel–

diesel blendby increasingthe crystallization onset temperature,therebyindicatingimprovedresistance to oxidativedegradation.

Furthermore, the observed thermal behavior suggests that the natural antioxidant compounds present in B. trigyna effectively

inhibit oxidation processes within the fuel system. Overall, these findings demonstrate that B. trigyna can serve as an efficient

natural antioxidant additiveand holds considerable potential for improvingthe oxidativestability and performance of biodieselbased fuel formulations.