Effect of Different Dried Methods and Storage on Some Enzymes Activity and Quality of Cactus pear and Papaya | ||
| Arab Universities Journal of Agricultural Sciences | ||
| Article 15, Volume 29, Issue 2, August 2021, Pages 689-700 PDF (390.9 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ajs.2021.77066.1382 | ||
| Authors | ||
| Marwa Abdel-Hady* 1; magdy El-shemy2; samar Mahdy2; Effat rizk1 | ||
| 1Food Technology Research Institute, Agriculture Research Center,Giza, Egypt | ||
| 2Food science Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt. | ||
| Abstract | ||
| This study was to evaluate the activity of peroxidase, polyphenoloxidase, pectin methyl esterase and protease as well as the proximate chemical composition and quality parameters of cactus pear and papaya which were dried by different methods and stored for 6 months. Our findings revealed that the highest moisture content was recorded in osmo – freeze drying of papaya and cactus pear. On the other hand, the browning index of oven dried papaya and cactus pear was higher than those dried with osmotic dehydration and osmo – freeze drying. The less activity of peroxidase was recorded in osmo – freeze drying of papaya and cactus pear. Also, the highest reduction of polyphe-noloxidase activity was noticed in osmo–freeze drying methods. While oven dried pa-paya recorded the highest activity of pectin methyl esterase pectin (0.34 %), complete in-activation was shown in other dried methods after 6 months of storage at 4 ±1℃. Different dried methods of papaya caused to reduce the activity of protease, moreover, complete inac-tivation was observed after 3 months from storage. The quality parameters for sensory evaluation of dried cactus pear and papaya demonstrated that osmo–freeze drying was more favorable to preserve samples followed by osmotic dehydration and oven drying. | ||
| Keywords | ||
| Cactus pear; Papaya; Peroxidase; Polyphenoloxidase; Protease | ||
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