张鹏, 袁兴铃, 薛友林, 贾晓昱, 李江阔. 精准温度控制对枸杞鲜果贮藏品质和香气成分的影响[J]. 农业工程学报, 2021, 37(18): 322-330. DOI: 10.11975/j.issn.1002-6819.2021.18.037
    引用本文: 张鹏, 袁兴铃, 薛友林, 贾晓昱, 李江阔. 精准温度控制对枸杞鲜果贮藏品质和香气成分的影响[J]. 农业工程学报, 2021, 37(18): 322-330. DOI: 10.11975/j.issn.1002-6819.2021.18.037
    Zhang Peng, Yuan Xingling, Xue Youlin, Jia Xiaoyu, Li Jiangkuo. Effects of precise temperature control on the storage quality and aroma components of fresh goji fruit[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2021, 37(18): 322-330. DOI: 10.11975/j.issn.1002-6819.2021.18.037
    Citation: Zhang Peng, Yuan Xingling, Xue Youlin, Jia Xiaoyu, Li Jiangkuo. Effects of precise temperature control on the storage quality and aroma components of fresh goji fruit[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2021, 37(18): 322-330. DOI: 10.11975/j.issn.1002-6819.2021.18.037

    精准温度控制对枸杞鲜果贮藏品质和香气成分的影响

    Effects of precise temperature control on the storage quality and aroma components of fresh goji fruit

    • 摘要: 为研究精准温控技术在枸杞鲜果保鲜中的应用效果,将枸杞分别装入泡沫箱(Control Check,CK)、泡沫箱+蓄冷剂(冰温)和精准温控箱+蓄冷剂(相温)中,记录箱内温度,结合贮藏期间枸杞的品质变化,通过主成分分析法对3组枸杞进行综合评价,并对不同处理香气成分进行分析。结果表明,精准温度控制后箱体内部温度更低,且温度波动保持在0.1 ℃以内,CK组、冰温组、相温组枸杞出现发霉腐烂现象的时间分别为10、20、40 d;贮藏40 d后,相温组枸杞的腐烂率为4.11%,远低于CK组的14.85%,色差低于3,亮度达34.12,可溶性固形物含量、可滴定酸含量、维生素C含量、类胡萝卜素含量分别较CK组高0.65个百分点、0.03个百分点、4.34 mg/100g、2.90 mg/g,相温组枸杞有效抑制腐烂率和失重率的增加,延缓色差的升高和亮度的降低,保持较高的可溶性固形物、可滴定酸、维生素C和类胡萝卜素含量,经主成分得分分析后得到3组枸杞的品质排序为相温组、冰温组、CK组,且精准温度控制贮藏的枸杞醛类、萜类等有利香气成分相对含量更高。因此,精准温度控制技术有利于枸杞鲜果的冷藏保鲜,其中相温贮藏效果更好。研究结果为枸杞鲜果精准温控保鲜提供参考。

       

      Abstract: Abstract: Goji (Lycium barbarum L.) is one of the most popular medicinal plants, particularly as a typical nutritional fruit supplement rich with bioactive compounds. However, fruits browning, taste loss, and storage intolerance often occur during postharvest, because of tender and juicy tissue. Among them, the temperature is one of the most significant factors to maintain the quality and extend the shelf life of fruits. It is necessary to place fruits in a constant temperature environment after harvest since temperature fluctuations and variation tend to induce product quality deterioration. This study aims to investigate the effect of precise temperature control on storage quality and aroma components of fresh goji fruits. Three treatments of storage temperature at 0℃ were also set, including foam box (CK), foam box + cool storage agent (ice temperature), as well as the precise temperature control box and cool storage agent (phase temperature). The temperature was real-time recorded in different cabinets to evaluate the storage quality. Principal component analysis (PCA) was used to evaluate the aroma components of goji. Results showed that the foam box containing the self-made refrigerant performed better at ambient temperature, compared with that with the ice. Temperatures in the box of CK, ice, and phase temperature group were (0.12±0.17), (-0.04±0.07) and (-0.05±0.04)℃, respectively, during the whole storage period. A cold accumulator provided a cold source in the box to maintain a low-temperature environment. The temperature distribution was more uniform in the precision temperature control box, while the maintenance time of low temperature was longer than before, due to the excellent performance of heat preservation. The time of mildew and rot in the CK group, ice, and phase temperature group were 10, 20, and 40 d, respectively. At the storage of 40 d, the rot rate in the phase temperature group were 4.11%, much lower than 14.85% in the CK group. Chromatic aberration ΔE was lower than 3, while Brightness L value reached 34.12. The content of soluble solid, titratable acid, Vitamin C conten, carotenoid were 0.65 percentage, 0.03 percentage, 4.34 mg/100g, 2.90 mg/g higher than CK group, respectively. Correspondingly, the treatment in the phase temperature group inhibited the increase of decay rate and weight loss rate, indicating the delay of ΔE and L, as well as a higher soluble solid, titratable acid, VC, and carotenoid content. The principal component analysis demonstrated that the goji quality in three groups was in the order of phase temperature group, ice temperature group and CK group. Moreover, the contents of favorable aroma components, such as lycium aldehydes and terpenoids, were relatively higher in the storage under precise temperature control. Consequently, the ice and phase temperature storage was the most effective in the long-term preservation of goji, where the color change of goji was delayed to facilitate the release of volatile substances, while effectively prolonging the storage period of goji to 30 days. The finding can be greatly beneficial to guide the preservation of goji fruits.

       

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