電漿活化水(PAW)是一項應用於食品中農藥降解的新技術。本研究發現PAW對新鮮菊花之農藥降解與品質的影響。電漿活化水是透過電漿噴射裝置以空氣作為工作氣體產出之電漿與逆滲透水反應而形成，本研究先測定電漿活化水之pH 值、導電度 (EC)、氧化還原電位 (ORP) 和活性物質(reactive species)濃度，而後使用電漿活化水分別處理已添加農藥(metribuzin與metobromuron)之菊花120秒、180秒和240 秒，而農藥則透過液相層析串聯質譜儀 (LC-MS/MS) 於電漿活化水處裡前後分別進行分析。研究結果指出，經處理菊花之電漿活化水能降解農藥，其原因可能因為其為酸性(pH=3.21)，且具有高導電度與氧化還原電位，同時含高濃度臭氧與過氧化氫。電漿活化水能降解74.32% 之metribuzin、38.00%之metobromuron，對於降解農藥有顯著影響。電漿活化水降解農藥之效率取決於不同電漿水的特性、農藥之特性，且隨處理菊花時間增加，降解效率亦增加。而透過電漿活化水處理之菊花，並未對顏色、總黃酮類含量、清除DPPH自由基能力、螯合金屬能力造成影響，但會輕微減低其香味與還原能力，若較長時間處理也會稍微降低菊花之總多酚類含量。綜上所述，本研究證明電漿活化水對於降解菊花中農藥之功效，且能同時保留原有營養價值與重要功效。

Plasma-activated water (PAW) is a novel technology that has recently been applied for pesticide reduction in food. Here, PAW was generated from atmospheric air and reverse osmosis water by using a plasma jet device, and its properties including pH, electrical conductivity (EC), oxidation-reduction potential (ORP), and reactive species concentration were measured. Then, the effects of PAW on pesticide reduction and quality of fresh chrysanthemum were investigated. For this purpose, metribuzin- and metobromuron-spiked chrysanthemums were subjected to PAW for 120, 180, and 240 sec, and the pesticides were analyzed using liquid chromatography with tandem mass spectrometry (LC-MS/MS) before and after PAW treatment. Results revealed that the generated PAW was acidic (pH 3.21), had high EC (449.30 μS/cm) and ORP (521.20 mV), and contained high ozone (1.15-1.46 mg/L) and hydrogen peroxide (24-24.67 mg/L) levels, which were all regarded as the important factors that reduced the pesticides. PAW significantly reduced pesticides (p<0.05), with maximum reduction efficiencies of 74.32% (metribuzin) and 38.00% (metobromuron). The pesticide reduction efficiency of PAW significantly increased with increasing treatment duration and varied depending on the characteristics of pesticides and PAW. Furthermore, the pesticide analysis of PAW solution implied that pesticide reduction was achieved via degradation. Finally, PAW did not cause negative changes in color, total flavonoid content, DPPH radical scavenging ability, and metal chelating ability of chrysanthemum, but minimally decreased the total phenolic content (after longer treatment), aroma, and reducing power ability. In conclusion, this study successfully demonstrated the effectiveness of PAW for pesticide reduction while retaining the important qualities and nutritional properties of chrysanthemum.

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