The present research aims to evaluate the effect on the stability of biodiesel during the storage period at 60°C and at low temperatures of the antioxidants from extracts of mango (biodiesel with extracts of mango), pitanga (biodiesel with extracts of pitanga) added at concentrations of 500, 2000, 4000 and 8000 parts per million to soybean biodiesel. All samples were characterized by the tests of acid value, kinematic viscosity, cloud point, pour point, pour point, cold filter plugging point and Fourier transform infrared (FTIR). Through the FTIR, it was observed that the CH and OH regions showed greater intensity for the non‐additive biodiesel (B100) in relation to the additive Biodiesel, which shows the antioxidant effect of the additives on the oxidative stability of biodiesel. The effect of the extracts on thermo‐oxidative stability follows the sequence: mango leaf extracts > pitanga leaf extracts > B100 after 504 h and at the low temperature the effect of antioxidant following sequence: pitanga extract > mango extract > B100 showing the effect of the antioxidant additives of leaf extracts on the stability of soybean biodiesel at regions of high and low temperatures. The mango and pitanga leaves extracts, are very promising as green antioxidant for biodiesel because it allows the longest storage time without deteriorating.

中文翻译：

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芒果（Mangifera indica L）和洋紫（Eugenia uniflora L）提取物作为抗氧化剂控制生物柴油氧化稳定性的新应用

本研究旨在评估在60°C储存期间和低温下，来自芒果提取物（含芒果提取物的生物柴油），皮坦加（含pitanga提取物的生物柴油）中的抗氧化剂对生物柴油稳定性的影响。大豆生物柴油中的浓度分别为500、2000、4000和8000 ppm。所有样品均通过酸值，运动粘度，浊点，倾点，倾点，冷滤器堵塞点和傅立叶变换红外光谱（FTIR）测试来表征。通过FTIR，观察到非添加剂生物柴油（B100）的CH和OH区域相对于添加剂生物柴油显示出更高的强度，这表明添加剂对生物柴油的氧化稳定性具有抗氧化作用。提取物对热氧化稳定性的影响顺序如下：芒果叶提取物> pitanga叶提取物> 504小时后B100；在低温下，抗氧化剂的作用顺序如下：pitanga提取物>芒果提取物> B100显示叶提取物的抗氧化剂添加剂对大豆生物柴油在高温和低温区域的稳定性的影响。芒果和pitanga叶提取物作为生物柴油的绿色抗氧化剂非常有前途，因为它可以使最长的储存时间而不会变质。B100显示了叶提取物的抗氧化剂添加剂对大豆生物柴油在高温和低温区域的稳定性的影响。芒果和pitanga叶提取物作为生物柴油的绿色抗氧化剂非常有前途，因为它可以使最长的储存时间而不会变质。B100显示了叶提取物的抗氧化剂添加剂对大豆生物柴油在高温和低温区域的稳定性的影响。芒果和皮唐加叶提取物作为生物柴油的绿色抗氧化剂非常有前途，因为它可以使最长的存储时间而不会恶化。