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Developing Radio-Frequency Roasting Protocols for Almonds Based on Quality Evaluations.

Ting-Yu Lian1, Su-Der Chen1

  • 1Department of Food Science, National Ilan University, Number 1, Section 1, Shen-Lung Road, Yilan 26041, Taiwan.

Foods (Basel, Switzerland)
|July 9, 2022
PubMed
Summary
This summary is machine-generated.

Radio-frequency (RF) heating offers a faster alternative to conventional hot air roasting for almonds. This study found RF-roasted almonds had improved quality, aroma, and sensory appeal, suggesting its potential for the food industry.

Keywords:
almondsaromaqualityradio frequency (RF)roasting

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Area of Science:

  • Food Science and Technology
  • Agricultural Engineering

Background:

  • Conventional hot air roasting of almonds is time-consuming.
  • Dielectric heating offers a potential alternative for faster food processing.

Purpose of the Study:

  • To evaluate the efficacy of radio-frequency (RF) dielectric heating for almond roasting.
  • To compare the quality and sensory attributes of RF-roasted almonds with conventionally roasted almonds.

Main Methods:

  • Almonds were roasted using a 5 kW, 40.68 MHz batch RF equipment at varying weights and times to reach 120 °C.
  • Quality attributes (color, moisture, acid value) and aroma profiles (GC-IMS) were analyzed.
  • Sensory evaluation and comparison with conventionally oven-roasted almonds were conducted.

Main Results:

  • RF heating significantly reduced roasting time compared to conventional methods (minutes vs. hours).
  • RF-roasted almonds exhibited desirable darker color, lower moisture content, and reduced acid value, indicating better preservation potential.
  • Gas chromatography-ion mobility spectroscopy (GC-IMS) and principal component analysis (PCA) showed RF roasting produced a richer aroma profile similar to commercial products.
  • Sensory evaluation favored RF-roasted almonds for flavor, texture, and overall preference.

Conclusions:

  • Radio-frequency dielectric heating is an efficient and effective method for roasting almonds.
  • RF roasting enhances almond quality attributes and sensory characteristics, offering a viable alternative for industrial applications.