Preliminary Screening of Early Warning Index for CO2 Injury of Garlic Scapes
Controlled atmosphere storage is a conventional storage technique for the long-term preservation of gar-lic scapes,the inappropriate CO2 volume fraction in the storage environment can injure garlic scapes.To control CO2 volume fraction to the maximum limits and give full play to its role in preservative,timely early warnings of CO2 injury are very necessary.In order to preliminarily screen volatile organic compounds(VOCs)with early warning of CO2 injury,the VOCs of garlic scapes in a volume fraction of 7％,9％,11％and 13％CO2 storage en-vironment were extracted respectively by solid phase microextraction technology.The composition and content of VOCs were determined by gas chromatograph-mass spectrometer(GC-MS)technology,the changes of VOCs of gar-lic under different volume fraction CO2 conditions were studied,and the relationship between VOCs and CO2 injury was analyzed.The results indicated that,at a temperature of 0 ℃ and an O2 volume fraction of 3％,garlic scapes were susceptible to CO2 injury when the CO2 volume fraction reached 11％or higher in the air regulation environ-ment.Under the conditions of injury and non-injury conditions,the content of mesitylene in garlic scapes was ob-viously different,and it showed an inflection point type of mutation at the critical concentration of CO2 injury(11％CO2).It was preliminarily predicted that the change of mesitylene content was related to the CO2 injury of garlic scapes,which could be used as a candidate early warning index for the occurrence of CO2 injury in garlic scapes.The results contribute to non-destructive early warning of CO2 injury in the commercial production of garlic scapes,and provide technical support for enhancing the storage outcomes through gas regulation.
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