Food Analytical Methods

, Volume 9, Issue 8, pp 2288–2298 | Cite as

An Improved Ultrasonic-Assisted Extraction Method by Optimizing the Ultrasonic Frequency for Enhancing the Extraction Efficiency of Lycopene from Tomatoes

  • Jianqing LiaoEmail author
  • Nan Zheng
  • Baida Qu


In order to assess the optimization of the ultrasonic frequency in a range of 18–146 kHz for extracting lycopene from tomatoes and evaluate its influence on the extraction efficiency, an improved ultrasonic-assisted extraction (IUAE) method was proposed by using a novel ultrasonic extraction and detection system, in which the ultrasonic frequency information could be converted to intuitive waveforms that are easily identified by eyes. Additionally, to improve the extraction yield of lycopene, in this work, the optimization of various process parameters by ultrasonic treatment, including extraction time, solvent/material ratio, extraction temperature, and ultrasonic power for improving the yield of lycopene were investigated. These results indicated that all of the considered parameters had effected on the yield of lycopene significantly, and the optimum extraction conditions were as follows: extraction time duration 20 min; ratio of solvent to material 2:1; extraction temperature 25 °C; ultrasonic power 200 W; ultrasonic frequency 46–48 kHz. In comparison with other extraction methods, such as conventional solvent extraction (CSE), supercritical fluid extraction (SFE), supercritical carbon dioxide co-extraction (SC-CO2), and existing UAE, the IUAE method achieved a far more extraction yield, a reduction of extraction time, and a smaller amount of solvent at lower temperature, which showed a great promising prospect in the extraction and separation of natural products.


Lycopene Ultrasonic frequency Ultrasonic extraction Improved ultrasound-assisted extraction (IUAE) 


Compliance with Ethical Standards


This study was funded by the Natural Science Foundation of Fujian Province of China (No. 2015J01661) and the Program of Motor Design and Control System by the Innovation Team of Ningde Normal University (No. 2013 T04).

Conflict of Interest

Jian-Qing Liao declares that he has no conflict of interest. Nan Zheng declares that she has no conflict of interest. Shun-Gen Xiao declares that he has no conflict of interest.

Ethical Approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed Consent

Not applicable.


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Key Laboratory of Industrial Advanced Process Control for Light Industry of Ministry of EducationJiangnan UniversityWuxiPeople’s Republic of China
  2. 2.Department of Physics and Electrical EngineeringNingde Normal UniversityNingdePeople’s Republic of China
  3. 3.School of Chemical and Environment ScienceShaanxi University of technologyHanzhongPeople’s Republic of China

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