Abstract
The study of the polymerization of a vegetable oil has a double interest; industrial but especially food. Industrial because polymers based on vegetable oil are in line with sustainable development; food because an oil which polymerizes easily is a danger for human consumption. Three situations of Cucurbita pepo oil polymerization are carried out in the course of time, the factor retained being temperature. A monitoring of the evolution of the enthalpy by temperature variation by the DSC method allows to report the polymerization of this oil. It happens that a polymerization is triggered in the oil matrix but it seems to fade very quickly, this behavior is general because after sweeping a temperature range of 80°C; 100°C and 150°C adding different amounts of Irgacure: the Cucurbita pepo oil resists polymerization through its antioxidant compounds. However, a photolysis of this oil carried out over 8 days shows that it effectively polymerizes after 144 hours, which proves the great capacity of antioxidant compounds to protect this oil. The analyses carried out at 25°C aim to simulate the behavior of the oil at room temperature. The results reveal good resistance to both thermochemical and photochemical polymerization, which opens up great prospects for its development in the food industry and in nutrition.
Highlights
At present, two major challenges are facing researchers in the field of natural substance chemistry in developing countries, namely: To comply with a logic of replacing petroleum-derived products because they are non-renewable and in opposition to the policy of sustainable development and environmental protection. To create conditions for valorizing local resources known as "from home" through clean chemical processes
A photolysis of this oil carried out over 8 days shows that it effectively polymerizes after 144 hours, which proves the great capacity of antioxidant compounds to protect this oil
The chemical composition of this oil reveals that it consists of 80% unsaturated fatty acid with less than 1% of C18:3 which would probably be at the origin of this polymerization
Summary
Two major challenges are facing researchers in the field of natural substance chemistry in developing countries, namely: To comply with a logic of replacing petroleum-derived products because they are non-renewable and in opposition to the policy of sustainable development and environmental protection. To create conditions for valorizing local resources known as "from home" through clean chemical processes. USDA [1] has shown that the use of so-called conventional oils in the world has reached record levels, non-conventional oils such as Cucurbitea pepo oil, having a composition [2] [3] almost identical to rapeseed for example, is not part of this dynamic [4] the need to develop it. Desroches et al [5] have shown that 14 billion tonnes of vegetable oils per year are used in the production of polymers, while pumpkin seed oil is likely to polymerize under certain conditions. The aim is to put the oil in a situation where the temperature favors radical reactions in order to evaluate the polymerization of pumpkin seed oil, which precedes many compounds with strong antioxidant power [3]. The power of the lamp having considerably damaged the antioxidant compounds, their action could not be followed
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