تولید بامیه با استفاده از پوشش پروتئین آب‌پنیر و بررسی ویژگی‌های کیفی آن طی نگهداری

نوع مقاله: مقاله پژوهشی

نویسندگان

گروه مهندسی علوم و صنایع غذایی، واحد ماکو، دانشگاه آزاد اسلامی، ماکو، ایران

چکیده

زمینه مطالعاتی: بامـیه یکی از شیرینی­های سنـتی است که به روش سـرخ کردن عـمیق تولید مـی­شود و دارای محـتوی روغن بالایی است. هدف پژوهش: در این تحقیق پوشش­دار کردن بامیه با استفاده از پوشش خوراکی پروتئین آب‌پنیر برای کاهش جذب روغن فراورده مورد مطالعه قرار گرفت. روش کار: سه نوع پوشش با درصد‌های مختلف پروتئین آب‌پنیر در محلول سوسپانسیون کلوئیدی (25/0، 5/0 و 75/0 درصد) و با نسبت ثابتی از سوربیتول (5/0%) تهیه شدند و پوشش­دهی با غوطه‌ورسازی بامیه­ها در داخل محلول انجام شد. ویژگی­های کیفی نمونه‌های بامیه شامل جذب روغن، رطوبت، اسیدیته و عدد پراکسید تعیین و ارزیابی حسی نمونه‌ها انجام شد. نتایج: بامیه‌های پوشش داده‌شده با 25/0، 5/0 و 75/0 درصد پروتئین آب‌پنیر به ترتیب 10، 20 و 31 درصد جذب روغن کمتری در مقایسه با شاهد نشان دادند (05/0>P). در بامیه‌های پوشش داده ‌شده با درصدهای مختلف پروتئین آب‌پنیر (25/0، 5/0 و 75/0 درصد)، باگذشت زمان نگهداری در روزهای مختلف نگهداری (1، 10، 20 و 30 روز)، افت رطوبت روند کاهشی نشان داد. اسیدیته و عدد پراکسید باگذشت زمان نگهداری در تمام نمونه­ها افزایش یافت اما کمتر از بیشینه حد مجاز بود. نتایج ارزیابی حسی نشان داد نمونه‌های پوشش داده‌شده با درصدهای مختلف پروتئین آب‌پنیر، شکل ظاهری، رنگ، مزه و بافت بهتری در مقایسه با شاهد داشتند. نمونه‌های پوشش داده ‌شده با 5/0 و 75/0 درصد پروتئین آب‌پنیر، پذیرش کلی بالاتری در مقایسه با سایر تیمارها نشان دادند. نتیجه‌گیری نهایی: پوشش پروتئین آب پنیر می‌تواند به عنوان پوشش خوراکی جهت کاهش جذب روغن در بامیه مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Bamieh production with the use of whey protein coating and evaluating its qualitative characteristics during storage

نویسندگان [English]

  • R Maghsouzadeh
  • A Jalilzadeh
چکیده [English]

Introduction: Bamieh is one of the traditional confectionaries that are produced by deep frying, and it has high oil content. Coating of foods with edible coatings and films has been suggested to reduce oil absorption during the frying process. Films and edible coatings are natural polymers made from agricultural materials. Edible films are either formed as coatings or embedded in food components, limiting the migration of moisture, lipids, and color between food components to improve the quality of non-homogenous foods (Khawaldia et al., 2004). Edible coating is a surface polymer coating that reduces surface porosity and impedes the entry of oil into the food (Ziaeifar et al., 2008). Whey protein based films and coatings have been noticed in recent years because, in addition to being biodegradable, they utilize whey as a major by-product of cheese industry.   Moreover, they have excellent oxygen and water vapor barrier properties, and consequently can be used in food packaging. The aim of this study was to investigate the effect of whey protein based coating on qualitative characteristics of Bamieh during storage. In this research, coating of Bamieh coating using whey protein solution (0.25, 0.5 and 0.75% w/w) was studied in order to reduce the oil uptake of the product.
Material and methods: For preparing of Bamieh dogh, the raw materials, including flour and water, were mixed well with a small amount of vanilla, then the dough was spread on the table and cooled to ambient temperature. Then, it was poured into the mixer and the eggs and saffron were added and stirred well in the mixer to obtain a smooth and uniform dough. To prepare colloidal suspensions, the required concentrations of whey protein (80% purity produced by Agri Mark, USA) and sorbitol (70% purity Cargill, USA) were mixed with water and heated to 90℃. It was completely homogenized to give a transparent solution. The solution was cooled to ambient temperature and the Bamieh samples were coated by immersing in the solution (Garcia et al., 2007). Three types of coating frmulations with different percentages of whey protein were prepared (0.25, 0.5 and 0.75%) with a constant ratio of sorbitol (0.5%). Qualitative characteristics of Bamieh samples including oil uptake (by Soxhlet method, moisture (according to Iranian National Standard Procedure No. 2705), acidity (by titration method with 0.1N sodium hydroxide), peroxide value (According to AOAC method No. 965/33) and sensory evaluation of samples were investigated. All of analysis were performed with 3 replications and the results were reported as mean of 3 replicates.
 Results and discussion: Analysis of oil uptake showed that, control samples had the highest oil uptake. By increasing the percentage of whey protein in the coating formulation, the oil uptake of Bamieh significantly decreased (P <0.05). Bamieh coated with 0.25%, 0.5% and 0.75% whey protein showed 10%, 20% and 31% lower oil uptake, respectively. This decrease in oil uptake in coated samples is due to the use of edible coating. Hydrocolloid coatings are able to physically prevent the penetration of oil into the nutrient due to the film-forming properties during heating. In the frying process due to the evaporation of moisture in the food, the oil replaces with water molecules. Thereby reducing the moisture content and increasing the oil content (Kester et al., 1986). Albert and Mittal (2002) showed that the use of hydrocolloids such as gelatin, gellan gum, capacaragine, methylcellulose, pectin, and whey protein isolate reduced the oil uptake in fried cereal products. The use of a plasticizer in the coating formulation contributes to the uniformity and enhances the coating's inhibitory property, reducing oil absorption and moisture outflow (Garcia et al. 2002). The results of moisture content analysis showed that Bamieh samples coated with different percentages of whey protein (0.25, 0.5 and 0.75%), had decreasing trend of moisture content during storage time on different days (1, 10, 20 and 30). During storage time, the acidity of all samples increased, which was higher in the coated samples compared to the control. However, the acidity of all samples was lower than the standard limit (0.2% maximum). The increased acidity is due to the hydrolysis of glycerol and the release of fatty acids that occur during the storage of edible oils and fats and oil-containing foods. The amount of hydrolysis depends on various factors such as the amount of food product moisture, the amount of oil, the storage temperature and the type of oil (Azadmard Damirchi, 1391). Analysis of peroxide values shoed that, the peroxide value of control and treated samples increased with different percentages of whey protein probably due to the oxidation of the oil in the samples during storage. All samples showed the highest peroxide value on day 30. Coating did not have significant effect on delaying oxidation. By coating the Bamieh with different percentages of coatings, the peroxide content in all samples were acceptable.
Comparing of the scores obtained for different characteristics of appearance, color, taste, texture and overall acceptance between different treatments showed that samples coated with different percentages of whey protein had better appearance, color, taste and texture compared to control. As the percentage of whey protein in the coating increased, the appearance, color, texture and overall acceptability increased. The samples coated with 0.5% and 0.75% whey protein showed higher overall acceptability score compared to other treatments. Applying the coating before frying creates a uniform layer around the food and causes the fried products to reduce their crispness by preventing moisture transferred into the shell or absorbing moisture from the food (Jorjani and Hamrahi, 2015).
Conclusion: Coating of Bamieh with whey protein concentrate edible reduced the absorption of oil uptake but had no effect on the reduction of the final product acidity and peroxide value. Coating of Bamieh with whey protein based coating at a concentration of 0.5 and 0.75% produces a low oil content and desirable sensory properties in terms of appearance, color, taste and texture. SoWhey protein coatings can be used as an edible coating to reduce oil absorption in Bamieh.

آزادمرد دمیرچی ص، 1391. تکنولوژی استخراج و تصفیه روغن­های گیاهی، انتشارات دانشگاه تبریز، تبریز.
اصلانی ژ، آزادمرد دمیرچی ص، تربیت م ع و رمضانی ی، 1394. تولید بامیه با پوشش کتیرا و بررسی برخی از ویژگی­های کیفی آن در طی نگهداری، نشریه پژوهش‌های صنایع غذایی، جلد 52، 1، 109-101.
ذوالفقاری ز س، محبی م و حدادخداپرست م ح، 1390. ﺗﺄﺛﯿﺮ ﻧﻮع ﭘﻮﺷﺶ ﻫﯿﺪروﮐﻠﻮﺋﯿﺪی و اﻓـﺰودن آرد ﺳـﻮﯾﺎ ﺑﺮ ویژگی­های ﺷﯿﻤﯿﺎﯾﯽ و ﻓﯿﺰﯾﮑﯽ ﭘﯿﺮاﺷﮑﯽ. ﻣﺠﻠﻪ پژوهش‌های ﺻﻨﺎﯾﻊ ﻏﺬاﯾﯽ، ﺟﻠﺪ 21، 1، 139-127.
جرجانی س، همراهی و، 1394. تأثیر هیدروکلوئیدهای گوار و زانتان بر کاهش جذب روغن در فرایند سرخ کردن بادمجان. نشریه پژوهش­های صنایع غذایی، جلد 52، 5، 238-231.
جعفریان س، 1380. تأثیر حرارت­دهی مقدماتی سیب‌زمینی و استفاده از برخی هیدروکلوئیدها در کاهش جذب روغن و کیفیت فرنچ فرایز منجمد نیمه سرخ‌شده. پایان‌نامه کارشناسی ارشد، دانشگاه صنعتی اصفهان.
علی­پور م، کاشانی نژاد م، مقصودلو ی و جعفری م، 1388. بررسی اثر کاراگینان، دمای روغن و زمان سرخ کردن بر میزان جذب روغن در محصولات سرخ‌شده سیب‌زمینی. نشریه پژوهش‌های صنایع غذایی ایران، جلد 5، 1، 27-21.
عاصمی ذ، ضیاء کاشانی ش، دولتی م ع، عابدی محتسب ت پ، حسینی ا و یوسفی ح، 1384. بررسی میزان پراکسید موجود در زولبیا و بامیه‌های شهر کاشان در سال 1383-1382، فصلنامه علمی و پژوهشی فیض، 36، 60-56.
عالی­پور هفشجانی ف، مهدوی هفشجانی ف و عالی­پور هفشجانی ع، 1394. تعیین ارزش پراکسید و رنگ ظاهری روغن‌های زولبیا و بامیه در ماه مبارک رمضان در استان چهارمحال و بختیاری. مجله دانشگاه علوم پزشکی شهرکرد، دوره 17، 5، 82-74.
Akdeniz, N, Sahin S and Sumnu G, 2005. Effects of different batter formulations on the quality of deep-fat-fried carrot slices. European Food Research and Technology 221: 99-105.
Albert S and Mittal G S, 2002. Comparative evaluation of edible coatings to reduce fat uptake in a deep-fried cereal product. Food Research International 35: 445-458.
AOAC: Association of Official Analytical Chemists, 1995. Official Methods of Analysis. Washington, DC.
Bajaj I and Singhal R., 2007. Gellan gum for reducing oil uptake in sev, a legume based product during deep-fat frying. Food Chemistry 104: 1472-1477.
Debnath S, Bhat K and Rastogi N, 2003. Effect of pre-drying on kinetics of moisture loss and oil uptake during deep fat frying of chickpea flour-based snack food. LWT-Food Science and Technology 36: 91-98.
Garcıa M, Ferrero C, Bertola N, Martino M and Zaritzky N, 2002. Edible coatings from cellulose derivatives to reduce oil uptake in fried products. Innovative Food Science and Emerging Technologies 3: 391-397.
Kester J J, Fennema O, 1986. Edible films and coatings: a review. Food technology, USA.
Khwaldia K, Perez C, Banon S, Desobry S, Hardy J, 2004. Milk proteins for edible films and coatings. Critical Reviews in Food Science and Nutrition 44: 239-251.
Meilgaard M.C, Carr B T and Civille G V, 2006. Sensory evaluation techniques. CRC press.
Mellema M, 2003. Mechanism and reduction of fat uptake in deep-fat fried foods. Trends in food science and technology 14: 364-373.
Quasem J M, Mazahreh A S, Abu-Alruz K, Afaneh I A, Al-Muhtaseb A H and Magee T, 2009. Effect of methyl cellulose coating and pre-treatment on oil uptake, moisture retention and physical properties of deep-fat fried starchy dough system. American Journal of Agricultural and Biological Sciences 4: 156-166.
Rayner M, Ciolfi V, Maves B, Stedman P and Mittal G S, 2000. Development and application of soy‐protein films to reduce fat intake in deep‐fried foods. Journal of the Science of Food and Agriculture 80: 777-782.
Seydim A and Sarikus G, 2006. Antimicrobial activity of whey protein based edible films incorporated with oregano, rosemary and garlic essential oils. Food Research International 39: 639-644.
Suárez R B, Campanone L, Garcia M and Zaritzky N, 2008. Comparison of the deep frying process in coated and uncoated dough systems. Journal of Food Engineering 84: 383-393.
Ziaiifar A M, Achir N, Courtois F, Trezzani I and Trystram G, 2008. Review of mechanisms, conditions, and factors involved in the oil uptake phenomenon during the deep‐fat frying process. International journal of food science and technology 43: 1410-1423.