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The ultrasound process is a non-thermal method of extraction, and due to its effective effects on food storage and processing its use is increasing. Therefore, the aim of current study was to investigate the effect of ultrasound waves on phenolic and flavonoid compounds extraction of lemon peel extract. In this method in order to evaluate the phenol and flavonoids extraction and to assess the inhibitory power of DPPH free radicals, three different water solvents, 70% ethanol and 80% methanol were used. Then, the best solvent for the extraction of these compounds at of 30, 60and 90 moments were compared. The software used for analysis of variance and comparison of means was SPSS. According to the results, the strongest and weakest solvent for the extraction of bioactive compounds were 70% ethanol and water, which was 8.202 and 6.95 mg, equal to Gallic acid per grams of dry extract of phenolic compounds, 4.61 and 3.74 mg equal to quercetin grams of compound flavonoids dry matter and 87.468 and 70.213 percent of the inhibitory power of DPPH-free radicals. In 70% ethanol solvent, a significant difference was observed between 30, 60 and 90 moments for extraction of effective compounds, and 90 and 30 minutes, respectively, had the highest and lowest extraction rates of the compounds, respectively. In each extraction method, the amount of extraction of bioactive compounds was different depending on the solvent and 70% ethanol solvent was the best extraction method.

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Kafka's novels are one of the Western novels that contemporary Arabic literature through it became familiar with the philosophy of existentialism and its principles. George Salem, a Syrian writer who was influenced by existentialism, read Kafka’s novels and was influenced in the novel “In exile” from his thoughts. This article follows and reveals the thoughts in the novel “In exile”.
Using an adaptive method, the present research studies Salem’s novel “in exile” and compares it with Kafka’s Palace and Trial and aims to reveal Salem’s impressibility from Kafka’s works and existential thoughts.
 Based on result, George Salem believes that human without any optional thrown into existence So that he finds himself in a certain situation. Influenced by Kafka’s works which instill existentialist concepts, the Syrian writer focuses in the first part of his novel on Kafka's novel “Palace” by relying on falling to the ground theme and in the second part relating to one’s dominance on an individual he focuses on Kafka's novel “Trial”. George survives Kafka reflects the existential topics in the novel ‘In exile’, Concepts such as original Sin, Guilt and human alienation.