Comparative Analysis of Dried Water Bamboo Shoots Using Different Drying Methods: Physicochemical Properties and...

Area of Science:

• Food Science
• Postharvest Technology
• Analytical Chemistry

Background:

• Drying is crucial for extending food product shelf life.
• Water bamboo shoots (WBS) are a food product susceptible to quality degradation during drying.

Purpose of the Study:

• To investigate the effects of four drying techniques on WBS quality.
• To analyze the volatile organic compound (VOC) profiles of dried WBS.

Main Methods:

• Four drying methods were applied: natural air drying (NAD), hot air drying (HAD), microwave drying (MD), and vacuum freeze drying (VFD).
• Quality attributes including Vitamin C, total phenols, color, and structure were assessed.
• Volatile organic compounds (VOCs) were identified and quantified using gas chromatography-mass spectrometry.

Main Results:

• Microwave drying (MD) exhibited the fastest drying rate; natural air drying (NAD) was the slowest.
• Vacuum freeze drying (VFD) and microwave drying (MD) produced porous structures.
• VFD samples retained the highest Vitamin C and total phenols, with minimal color change.
• 52 VOCs were identified; 3-methyl-butanal and 5-methyl-2-furfural were most abundant.
• Characteristic VOC markers were identified for each drying method: butanal for VFD.

Conclusions:

• Vacuum freeze drying (VFD) is the most effective method for preserving the quality of dried water bamboo shoots (WBS).
• Butanal is identified as the characteristic VOC marker for VFD-treated WBS, offering potential for quality assessment.