摘要:
为有效解决生产实践中兰州百合鳞茎片的保鲜问题,本文研究了三种绿色保鲜剂处理对兰州百合鳞茎片低温贮藏期间品质和抗氧化活性的影响。先将新鲜完整的兰州百合鳞茎剥片,鳞茎片称重分组,分别用蒸馏水,0.5 mmol/L的水杨酸溶液,6 mg/L的二氧化氯溶液,1%的壳聚糖溶液浸泡处理10 min,捞出自然晾干鳞片表面水分后于4 ℃下贮藏15 d。结果表明,相比蒸馏水对照处理,水杨酸、二氧化氯、壳聚糖三种保鲜剂均不同程度地促进了兰州百合鳞茎片的总酚(贮藏末期分别比对照高出33.44%、27.36%、11.46%)、总黄酮含量(贮藏末期分别比对照高出34.52%、27.56%、8.57%)和DPPH自由基清除率(贮藏末期分别比对照高出36.23%、38.90%、9.88%)、总抗氧化能力的上升(贮藏末期分别比对照高出43.71%、38.46%、7.31%),抑制其褐变(贮藏末期分别低于对照4.61%、10.86%、0.45%)、丙二醛的积累(贮藏末期分别低于对照11.33%、28.00%、1.07%)以及VC含量的下降(贮藏末期分别比对照高出24.62%、23.83%、4.54%),其中,二氧化氯和水杨酸处理较壳聚糖处理效果更显著。单一保鲜剂二氧化氯和水杨酸处理能很好地保持兰州百合鳞茎片的品质并提高其抗氧化活性。
Abstract:
In order to effectively solve the problem of preservation of Lanzhou lily bulbs in production practice, the effects of three different green fresh-keeping agents on quality and antioxidant activity of Lanzhou lily bulb slices during storage at low temperature were investigated. The fresh and intact Lanzhou lily bulbs were stripped, weighed and grouped, and then soaked the grouped slices in distilled water, 0.5 mmol/L salicylicacid solution, 6 mg/L chlorine dioxide solution, and 1% chitosan solution for 10 min respectively. Removed the scales and dried their surface moisture naturally, and then stored them at 4℃ for 15 days. The results showed that, the three preservatives improved the total phenolic (the end of storage was 33.44%, 27.36%, 11.46% higher than the control), total flavonoid contents (the end of storage was 34.52%, 27.56%, 8.57% higher than the control), DPPH free radical scavenging rates (the end of storage was 36.23%, 38.90%, 9.88% higher than the control) and total antioxidant capacity (the end of storage was 43.71%, 38.46%, 7.31% higher than the control), inhibited their browning (the end of storage was 4.61%, 10.86%, 0.45% higher than the control), accumulation of malondialdehyde (the end of storage was 11.33%, 28.00%, 1.07% higher than the control), and decline of VC contents (the end of storage was 24.62%, 23.83%, 4.54% higher than the control) of Lanzhou lily bulb slices to a certain extent compared with the distilled water control treatment, among which, the treatment of chlorine dioxide and salicylic acid were more effective than chitosan. A single preservative treatment of chlorine dioxide and salicylic acid could maintain the quality of Lanzhou lily bulb slices and increase its antioxidant activity.