نوع مقاله : مقاله کامل علمی پژوهشی
نویسندگان
1 دانشگاه علوم کشاورزی و منابع طبیعی خوزستان
2 گروه علوم و صنایع غذایی، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and Objectives: Nowadays, there is a growing demand for artificial preservatives-free food products, due to the concerns about their adverse effects. In recent years, numerous studies have led to the identification of various natural compounds have the potential to be used as preservatives in variety of food products. For instance, plant metabolites, such as the essential oils of aromatic plants, possess antioxidant and antimicrobial properties. These attributes have led to their widespread use in various industries, particularly in the food industry. Mayonnaise is one of the most popular and widely used sauces in the world, applied to prepare a variety of foods, such as salads and sandwiches. Due to the absence of thermal processing and the use of chemical artificial preservatives in mayonnaise, it is advisable to consume it in moderation and with caution. The aim of this study was to investigate the possibility of using Mentha spicata L. essential oil in the formulation of mayonnaise as a natural antioxidant and its effects on some physicochemical and microbiological properties of mayonnaise.
Materials and Methods: Fresh M. spicata leaves were collected from the northern of Iran and dried. The essential oil was extracted by distillation with water using a Clevenger device, and its volatile components were identified and measured by gas chromatography-mass spectrometry (GC/MS). The total phenolic content of the essential oil was determined by the Folin-Ciocalteu method. In addition, the free radical scavenging activity of the essential oil was evaluated by DPPH and ABTS assays, using BHT as a synthetic antioxidant as a reference. The minimum inhibitory concentration (MIC) of the essential oil was assessed against Gram-positive (Bacillus cereus, Staphylococcus aureus and Listeria innocua) and Gram-negative (Escherichia coli, Salmonella typhi and Pseudomonas aeruginosa) bacteria. M. spicata essential oil was added to the mayonnaise sauce in different concentrations (500, 1000, 2000 ppm) and its antioxidant activity was investigated under accelerated oxidation conditions (90°C temperature) for seven days. In current research, the peroxide, acid, and thiobarbituric acid values of mayonnaise samples containing concentrations of 500, 1000 and 2000 ppm of M. spicata essential oil were calculated. Then, they were compared with sauce samples containing concentrations of 100 and 200 ppm of BHT artificial preservative.
Results: 32 compounds were identified in the essential oil by GC-MS and the results showed that carvone (57.01%), d-limonene (16.79%), 1,8-cineole (7.56%) and beta-caryophyllene ( 2, 10%) were the main components of M. spicata essential oil. The total phenolic contents of the essential oil were found to be 0.246 mg of gallic acid per gram (dry weight). The tests performed for peroxide, acidity and thiobarbituric acid values showed that the use of high concentrations of the essential oil can be a favorable alternative to artificial antioxidants in mayonnaise. Additionally, the results of the antibacterial activity demonstrated that the diameter of the microbial growth inhibition zone of pathogenic Gram-positive Bacillus cereus and Staphylococcus aureus strains was greater than the Gram-negative strains of Pseudomonas aeruginosa, Escherichia coli and Salmonella typhi. However, among the pathogenic Gram-positive strains, Listeria innocua strain had the smallest microbial growth inhibition zone. Furthermore, the results of sensory evaluation showed that the essential oils concentrations of up to 1000 ppm had no significant effect on the sensory characteristics of mayonnaise.
Conclusion: Based on the findings of this study, it is possible to propose the use of M. spicata essential oil, known for its mild and pleasant aroma, as a natural antioxidant to prevent oil oxidation and extend the shelf life of mayonnaise.
کلیدواژهها [English]
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