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Journal of Food Science and Technology

, Volume 52, Issue 2, pp 1138–1144 | Cite as

The influence of cooking process on the microwave-assisted extraction of cottonseed oil

  • Mostafa Taghvaei
  • Seid Mahdi JafariEmail author
  • Shahram Nowrouzieh
  • Omran Alishah
Original Article

Abstract

Cooking process is one of the most energy and time consuming steps in the edible oil extraction factories. The main goal of this study was cottonseed oil extraction by microwave radiation and elimination of any heat treatment of cottonseeds before extraction. The effect of cooking process on the physicochemical properties of extracted oil from two varieties of cottonseed (Pak and Sahel) was evaluated by free fatty acid content, melting point, smoke point and refractive index. Our results didn’t show any significant differences between cooked and uncooked samples (P > 0.05) regarding physicochemical characteristics. From GC analysis of extracted oils, it was found there is no significant difference in fatty acid composition of cooked, uncooked and control (conventional extraction) samples. The thermal stability (Rancimat) analysis of oil samples showed the cooking process could cause a slight increase in the stability of oils for both varieties (about 40 min). The cooking process also increased total extracted phenolic compounds and considerably decreased total gossypol content of the cottonseed oil; but the extraction efficiency didn’t change considerably after elimination of the cooking process. It can be concluded that microwave rays can destroy the structure of oil cells during process and facilitate the oil extraction without any heat treatment before extraction.

Keywords

Microwave Cooking Edible oil Cottonseed Gossypol 

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Copyright information

© Association of Food Scientists & Technologists (India) 2013

Authors and Affiliations

  • Mostafa Taghvaei
    • 1
  • Seid Mahdi Jafari
    • 1
    Email author
  • Shahram Nowrouzieh
    • 2
  • Omran Alishah
    • 2
  1. 1.Department of Food Materials and Process Design Engineering, Faculty of Food Science and TechnologyUniversity of Agricultural Sciences and Natural ResourcesGorganIran
  2. 2.Cotton Research InstituteGorganIran

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