Quality And Physiological Characteristic Changes Of Capsella Bursa-pastoris During Refrigerated Storage

The fresh Capsella bursa-pastoris after removing roots, decay and yellow leaves werepacked in plastic bags either loosely closed or opened with each sample 200 grams, andthen stored at 0℃. The treatment was replicate for 3times. The weight loss, etiolation rate,contents of chlorophyll, cellulose, O₂^·-and MDA, activities of chlorophyllase, cellulase,SOD, POD and PAL were determined at the interval of 3 days to investigate the quality andphysiological characteristic change of Capsella bursa-pastoris during storage period. Theresults is showed as following:1. The weight loss of Capsella bursa-pastoris at 0℃, no matter loosely closed packedor openly packed, was all very small during first 6 days, and then the weight loss of openlypacked Capsella bursa-pastoris increased greatly with extending storage duration reached7.3% at the end storage of 12days, compared with only 2.0% weight loss in the looselyclosed packed Capsella bursa-pastoris.2. The etiolation rate of Capsella bursa-pastoris increased graduallyat the early stageof storage and increased sharply after 6 days during storage at 0℃. Both etiolation rate ofloosely closed packed and openly packed Capsella bursa-pastoris at the end of storage (12days) reached nearly 30%. Making comparison of etiolation rate of two type package,openly packed Capsella bursa-pastoris etiolated faster during first 6 days, while looselyclosed packed etiolated faster during second 6 days.3,Reducing sugar change of two type packed Capsella bursa-pastoris had differentpattern at 0℃storage period. Reducing sugar in loosely closed packed Capsellabursa-pastoris slowly decreased continously, while reducing sugar in openly packedCapsella bursa-pastoris redued at first 3 days, remained stable between 3 and 6 days, andthen increased until the end of storage. Vitamin C in both loosely closed packed andopenlypacked Capsella bursa-pastoris showed the same change trendency, i.e. increasing winthin3 days, decreasing between 3 and 6 days and then remainging stable, and there was nosignificant different between them. The chlorophyll content of both packed Capsellabursa-pastoris decreased significantly during storage at 0℃with a little less loss of chlorophyll in loosely closed packed Capsella bursa-pastoris. Compared to celluloseamount at the beginning of the storage, cellulose gradually increased up to more than 120%with more increase in opened packed Capsella bursa-pastoris.4. The respiratory rate of Capsella bursa-pastoris packed in loosely closed plastic bagsand stored at 0℃was increased dring first 9 days and then sharply decreased, while thatof Capsella bursa-pastoris packed openly in plastic bags and stored at 0℃was overallslightly decreased, therefore the loosely closed packed Capsella bursa-pastoris had agreater respiratory rate. The relative conductivity of loosely closed packed Capsellabursa-pastoris during storage at 0℃was stabe with a little increase, while the relativeconductivity of openly packed Capsella bursa-pastoris during storage at 0℃was increasedsignificantly in first 6 days and then decreased greatly. The both content of O₂ and MDAand maximum value in the tissue of Capsella bursa-pastoris packed in loosely closedplastic bags and stored at 0℃were smaller than that of Capsella bursa-pastoris packedopenly in plastic bags and stored at 0℃.5. The activities of chlorophyllase and cellulase in Capsella bursa-pastoris packed inloosely closed plastic bags and stored at 0℃were all changed not too much, and theactivity change was smaller than that of Capsella bursa-pastoris packed openly in plasticbags and stored at 0℃. The change of chlorophyllase and cellulase activities showed thesame tendency, which was increased first and then decreased. Capsella bursa-pastoris hadno PPO activity. During storage period at 0℃, SOD activity in Capsella bursa-pastoriswas slow down, while POD and PAL were slowly increased. The activity difference ofSOD, POD and PAL between two package types was not significant.6. The content of total phenols (TP) and free phenols (FP) in fresh Capsellabursa-pastoris was 9.483 and 2.177ug·g^-1FW, respectively, and the ratio of free phenols (FP)to total phenols (TP) was 27.86%. The main phenol in the tissue of bursa-pastoris wasPyrogallol Pyrogallic Acid.7. The storage duration of Capsella bursa-pastoris which was loosely packed andstored at 0℃could be as long as 12 days.