Effect of gelatin edible coating containing antioxidant agents on hardness, and color of roasted pistachio nuts

Khoshnoudinia, Sara; Sedaghat, Naser; Radmard Ghadiri, Gholam-Hossein

doi:10.22101/JRIFST.2014.03.01.241

Effect of gelatin edible coating containing antioxidant agents on hardness, and color of roasted pistachio nuts

Document Type : Original Paper

Authors

¹ MSc. Student, Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran

² Associate Professor, Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran

³ Lecturer, Department of Food Science and Technology, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran

10.22101/JRIFST.2014.03.01.241

Abstract

The present study investigated the effect of gelatin coating, containing ascorbic-acid (AA:1% w/v) and Propyl-gallate (PG:100ppm), on the instrumental and sensory properties of roasted pistachio (hardness and color). Pistachio nuts packed and stored at 35°C and 50°C. The changes occurred in the textural properties, moisture content, color parameter (‘L’, ‘a’ and ‘b’ values) and sensory attributes of pistachio nuts were determined during 3 months of storage. The instrumental properties were correlated with sensory attributes. Gelatin-antioxidants coating significantly (P<0.05) increased instrumental and sensory hardness of pistachio. The moisture content decrease with time in gelatin-antioxidants and antioxidant-coated samples. However, this value in gelatin-coated samples was significantly lower than another sample. In sensory evaluation of color, the effect of treatments was significant. The image-processing result revealed that color parameter a* in green kernel beside L* and b* parameter in purple skin of kernel, was significantly increased in AA-gelatin coated pistachio. Using the gelatin-antioxidants coating, brought better maintenance to the green color of the kernel (the ∆E* factor lower than control sample) while it decreased the red-purple color of kernel skin (more ∆E* factor). The results indicated that there are strong relationships between the instrumental and sensory hardness values, but sensory and instrumental color values had a weak correlation with each other.

Keywords

References

عدالتیان، م. ر.، صداقت، ن.، و شریف، ع. 1386. تأثیر درجه حرارت، نوع بسته بندی و زمان نگهداری بر سفتی بافت پسته رقم اوحدی و مقایسه آن با فاکتورهای حسی. مجله پژوهشهای عاوم و صنایع غذایی ایران، 3، 1: 7-1.

مقصودلو، ع.، مقصودلو، ی.، خمیری، م.، و قربانی، م. 1391. بررسی فعالیت ضد قارچی پوشش خوراکی کیتوزان و تاثیر آن بر جذب رطوبت و ویژگی‌های ارگانولپتیکی مغز پسته. نشریه پژوهش و نوآوری در علوم و صنایع غذایی. جلد 1، شماره 2: 98-87.

موسسه استاندارد و تحقیقات صنعتی ایران. 1375. روش اندازه گیری رطوبت خشکبار. استاندارد ملی ایران، شماره 672، چاپ پنجم.

نیک‌زاده، و.، صداقت، ن.، و شهیدی، ف. 1390. بررسی تغییرات رطوبت، بافت و خصوصیات حسی پسته تحت تأثیر دمای برشته کردن و زمان نگهداری.فصلنامه علوم و صنایع غذایی، دوره‌ 8، شماره 1: 9-1.

نیک‌زاده، و. صداقت، ن.، و شهیدی، ف. 1386. بررسی اثرات دمای برشته کردن، فرمولاسیون و زمان نگهداری بر ویژگی‌های فیزیکوشیمیایی و ارگانولپتیکی پسته. پایان‌نامه‌ی کارشناسی ارشد، دانشکده کشاورزی دانشگاه فردوسی مشهد.

Abdul Haq, M., Junaid Alam, M., & Hasnain, A. 2013. Gum Cordia: A novel edible coating to increase the shelf life of Chilgoza (Pinus gerardiana). LWT - Food Science and Technology, 50: 306-311.

Afshari-Jouybari, H., & Farahnaky, A. 2011. Evaluation of Photoshop software potential for food colorimetry. Journal of Food Engineering, 106: 170–175.

Amerine, A., Panqporn, R.N., & Rossler, E.B. 1965. Principles of sensory evaluation of food. Food Science and Technology Monographs. Academic Press, New York.

Baldwin, E.A. 2007. Surface treatments and edible coatings in food preservation.P. 475-508. In M.S. Rahman (ed.), Handbook of Food Preservation. Florida- USA. Boca Raton. CRC Press.

Baldwin, E.A., & Wood, B. 2006. Use of edible coating to preserve pecans at room temperature. HortScience, 41(1): 188–192.

Bayram, M. 2011. Comparison of unsplit inshell and shelled kernel of the pistachio nuts. Journal of Food Engineering, 107: 374–378.

Bonilla, J., Atares, L., Vargas, M., & Chiralt, A. 2012. Edible films and coatings to prevent the detrimental effect of oxygen on food quality: Possibilities and limitations. Food Engineering, 110: 208–213.

Christopoulos, M.V., & Tsantili, E. 2011. Effects of temperature and packaging atmosphere on total antioxidants and colour of walnut (Juglans regia L.) kernels during storage, Scientia Horticulturae, 131: 49–57.

Crop Life International. 2009. Guidelines for specifying the shelf life of plant protection products technical monograph. No 17, 2nd ed: 3-9.

Dai, C.A., & Liu, M.W. 2006. The effect of crystallinity and aging enthalpy on the mechanical properties of gelatin films. Materials Science and Engineering, 423: 121–127.

Girolami, A., Napolitano, F., Faraone, D., & Braghieri, A. 2013. Measurement of meat color using a computer vision system. Meat Science, 93: 111–118.

Gómez-Guillén, M.C., Giménez, B., López-Caballero, M.E., & Montero, M.P. 2011. Functional and bioactive properties of collagen and gelatin from alternative sources: A review, Food Hydrocolloids, 25: 1813-1827.

Labuza, T. P., & Schmidl, M. K. 1985. Accelerated shelf life testing of food. Food Technology, 39 (9): 57-62.

Lee, S.Y., Trezza, T.A., Guinard, J.X., & Krochta, J.M. 2002. Whey-protein-coated peanuts assessed by sensory evaluation and static headspace gas chromatography. Food Science, 67: 1212–1218.

Maté, J.I. & Krochta, J.M. 1997. Whey protein and acetylated monoglyceride edible coatings: effect on the rancidity process of walnuts. Agricultural and Food Chemistry, 45(7): 2509–2513.

Mehyar, G.F., Al-Ismail, KH., Han, J.H., & Chee, G.W. 2012. Characterization of edible coatings consisting of pea starch, whey protein isolate, and carnauba wax and their effects on oil rancidity and sensory properties of walnuts and pine nuts. Journal of Food Science, 77(2): 52-59.

Meullenet, J.F.C., & Gross, J. 1999. Instrumental single and double compression tests to predict sensory texture characteristics of foods. Journal of Texture Studies, 30 (2): 167-180.

Min, S., & Krochta, J.M. 2007. Ascorbic acid-containing whey protein film coatings for control of oxidation. Agricultural and Food Chemistry, 55 (8): 2964-9.

Nur Hanani, Z.A., Roos, Y.H., & Kerry, J. P. 2012. Use of beef, pork and fish gelatin sources in the manufacture of films and assessment of their composition and mechanical properties. Food Hydrocolloids, 29: 144-151.

Plataniotis, K.N., & Venetsanopoulos, A.N. 2000. Color image processing and applications: Color spaces. Springer, New York: 1-45.

Shayanfar, Sh., Kashaninejad, M., Khomeiri, M., Mostofi, Y., & Emam Jomeh, Z. 2008. The effect of MAP and different atmospheric condition on the color of in hull fresh pistachio nut. P. 1-6. 18th National Congress on Food Technology, 15-16 Oct. 2008. Mashhad, Iran.

USDA. 2013. Tree nuts: pistachios world markets and trade. Foreign Agricultural Service /USDA. Circular Series February 2013: 2-10.

Vincent, J. F. V. 2004. Application of fracture mechanics to the texture of food. Engineering Failure Analysis. 11: 95-704.

Wittaya, T. 2012. Protein-based edible films: characteristics and improvement of properties. in a.a. eissa (ed), structure and function of food engineering. Available at http://www.intechopen.com/books/structure-and-function-of-food-engineering/protein-based-edible-films-characteristics-and-improvement-of-properties (visited 11 May 2013).

Yam, K. L. and S. E. Papadakis. 2004. A simple digital imaging method for measuring and analyzing color of food surfaces. Journal of Food Engineering, 61, 137-142.

Zhao, Y., & McDaniel, M. 2005. Sensory quality of foods associated with edible film and coating systems and shelf-life extension. P. 434-453. In J.H. Han (Ed). Innovations in Food Packaging, Academic Press. London. Technology & Engineering.

Zhao, Y. 2011. Application of commercial coatings.P. 320-330. In E.A. Baldwin et al. (ed), Edible Coatings and Films to Improve Food Quality. Part 9. 2nd ed. Florida- USA. CRC Press.