Investigation the role of Plasma-Activated Water Washing and Storage on the Shelf Life of Cestrum nocturnum L. (Night-Blooming Jasmine) Flowers

Abstract

This study investigates the impact of Plasma-Activated Water (PAW) washing and storage on the shelf life of Night-Blooming Jasmine (NBJ) flowers (Cestrum nocturnum L.). NBJ flowers, known for their fragrant properties and diverse applications, have a short natural shelf life. PAW is generated using a pencil plasma jet with varying plasma treatment times (10 to 30 minutes) and is utilized for washing and storing NBJ flowers. The flowers undergo microbial analysis, sensory evaluation, weight loss assessment, spoilage evaluation, color analysis, and antioxidant activity measurement after PAW washing and storage. PAW exhibits an increasing acidity and oxidative potential, along with a higher concentration of reactive species (NO3ˉ ions, NO2ˉ ions, H2O2, dissolved O3) with longer plasma treatment times. Washing NBJ flowers with PAW significantly reduces microbial growth, weight loss, and spoilage, maintaining better sensory properties compared to control-washed flowers. However, PAW, when used as a storage medium, negatively impacts the flowers, causing oxidative damage, compromised membrane integrity, and higher spoilage. PAW-washed NBJ flowers retain color intensity and delay browning while preserving antioxidant activity. PAW, as a washing medium, proves effective in preserving the quality of flowers. Caution is advised when using PAW as a storage medium, as prolonged exposure leads to oxidative damage and compromises the overall quality of flowers. Further optimization of plasma treatment times is crucial for balancing the positive and negative effects of PAW on flower preservation.