English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

O presente trabalho teve como objetivo avaliar o estado de degradação do óleo de soja utilizado em frituras descontínuas. A qualidade do óleo foi monitorada durante o processo de fritura mediante análises físico-químicas como dienos conjugados (%) e ácido tiobarbitúrico - TBA (mmoles g-1) e determinação de compostos polares totais (%). Verificou-se que os valores de dienos aumentaram significativamente com o tempo e atingiram 1,87% após 15 horas para a Fritadeira I e 1,76% após 22,5 horas para a Fritadeira II. Os índices de TBA alcançaram ao final do processo, valores de 0,0265 e 0,0210 mmoles g-1 para as Fritadeiras I e II, respectivamente. As porcentagens de compostos polares totais apresentaram aumento de seis e oito vezes em relação à amostra original partindo de valores de 5,9% e 3,7% e atingindo valores de 36,8% e 29,2%, para as Fritadeiras I e II, após 15 e 22,5 horas de aquecimento, respectivamente. Assim, conclui-se que houve um aumento nas alterações do óleo de soja com o tempo de fritura, em ambas as fritadeiras. O óleo utilizado na Fritadeira I foi o que apresentou maior grau de alteração, quando comparado com o óleo da Fritadeira II, apesar do menor tempo de aquecimento. Considerando-se os limites permitidos pelas legislações de alguns países como compostos polares inferiores a 25%, os óleos das duas fritadeiras já encontravam sem condições de uso no momento do descarte The main objective of this study was to evaluate the degree of degradation of the soybean oil used in frying processes. The quality of the oil during the frying process was evaluated by means of physical-chemical analyses, such: conjugated dienes (%) and TBA index (mmoles g-1), and determination of total polar compounds (%). It was observed that the values of conjugated dienes increasing significantly with time until 1.87% after 15 hours for fry pans I and 1.76% after 22.5 hours for fry pans II. The TBA indexes reached at the end the frying process values of 0.0265 and 0.0210 mmoles g-1 for fry pans I and II, respectively. The percentages of total polar compounds have shown an increase of six and eight times in relation to the original sample starting from 5.9% and 3.7% and reaching values of 36.8% and 29.2%, for fry pan I and II, after 15 and 22.5 hours of heating, respectively. It has been concluded that the alterations of the soybean oil increased as the time of frying increased, for both fry pans. The oil used in fry pan I showed greater alteration than the that observed in the oil used in fry pan II, in spite of the time of heating being shorter. Taking into consideration that the levels of polar compounds should be less than 25% according to the legislation of several countries, the oils used in both fry pans were already inadequate conditions at the moment of disposal

Avaliação do óleo de soja submetido ao processo de fritura de alimentos diversos