Characteristics of Guava (Psidium guajava L.) Treated With Ozonation During Ambient Storage
Crystal guava (Psidiumguajava L.) is a kind of fruit which easily damaged due to various factors. Without proper treatment, crystal guava will had physical damages. The aims of this study were to determine the differences in physical, chemical, microbiological characteristics, and pesticide residue between crystal guava treated and untreated in ozone. Ozonation process was conducted by using ozonizer TIP-01 at the concentration of 1.1 ppm for 5 minutes, and stored at room temperature (25± 2 0C) observed for 6 days with 2 replicates. The explanatory methods was employed followed by t-test. The characteristics observed were color lightness, hardness, vitamin C content, moisture content, totally microorganism, and pesticide residue. The results showed that after storage for 6 days at room temperature, the ozone treatment reduced the lightness, hardness, vitamin C content, totally microorganism, and pesticide residue, while moisture content increased.
Keywords: guava; ozone; ambient storage
 O’Donnel, C., B.Tiwari, P. Cullen, and R.G. Rice. 2012. Ozone in Food Processing. Dalam Ozone in Fruit and Vegetable Processing (hal. 73). UK: Willey-Blackweel
 Khadre, M., A.E. Yousef, and J.G. Kim. 2001. Microbilogical Aspect of Ozone Aplication in Food. Food Science 66, 12442-1252.
 AOAC, 2000. Officials Methods of Analysis. Washington D.C. The Association of Official Chemist
 Meilgaard, M., G.V. Civille, and B.T. Carr. 2000, Sensory Evaluation Technique Third Edition, New York, CRC Press
 Ong, M. K., A. Ali, P.G. Alderson, and F.C. Forney. 2014. Effect of different Concentration of Ozone on Physiological Changes Associzted to Gas Exchange, Fruit Ripening, Fruit Surface Quality and Defence-related Enzyme Levels in Papaya Fruit during Ambient Storage. Scientia Horticulturae, 163-169.
 Pratt, H.K., J.D. Goeschl. 1969. Physiological role of ethylene in plants. Annu. Rev.Physiol. 20, 84–541.
 Forney, C. F. 2003. Postharvest Response of Horticultural Product to Ozone. Food Product Press, 13-54.
 Kader, A.A. 1992. Portharvest Biology of HolticultureCrops: An Overview. Davis. Departement of Pamology, University of California
 Tzortzakis, N., A. Borland, I. Singleton, and J. Barnes. 2007. Impact of Atmospheric Ozone-enrichment on Quality Related Attributes of Tomato Fruit. Postharvest Biology and Technology 45, 317-325.
 Matashi, K. And Y. Kentarou. 2009. Microorganism-deterioration of banana in transport [in Japanese]. Journal of Memoirs of the Faculty of Agriculture of Kinki University 207-213
 Restaino, L., E. Frampton., W. J.B. Hemphill, and P. Palnikar. 1995. Efficacy of ozonated water against various food-related microorganisms. Applied and Environmental Microbiology, 61(9), 3471–3475.
 Miller, F., C Silva., and T. Brandao. 2013. Ozone based Treatment for Fruit and Vegetables Preservation. Food Eng Rev 5, 77-106.
 Kim, J-G., A.E. Yousef, and G.W. Chism. 1999. Use of ozone to inactivate microorganisms on lettuce. J. Food Safety. 19:17-34
 Rey, R.P., A.N. Selles, C. Baluja, M.L. Otero. 1995. Ozonation Kinetics Of Glucosamine and N-acetyl glucosamine in aquoeus medium. Ozone-SciEng 17(4):463-467.
 Waluyo, K. A., L. Soesanto, dan H.A. Djatmiko. 2010. Keefektifan Tebukonazol dan Trichodermaharinazum Tunggal dan Gabungan terhadap Tiga Penyakit Penting karena Jamur pada Padi Sawah. Bayer Crop Science.
 Musaddad, D. 2011. Penetapan Parameter Mutu Kritis Untuk Menentukan Umur Simpan Kubis Bunga Fresh-cut. J. Agribisnis dan Pengembangan Wilayah Vol.3 No.1
 Setiasih, I.S., R. Kastaman, D. Musaddad, dan I. Hanidah. 2013. Laju Perubahan Mutu Kubis Bunga Diolah Minimal pada Berbagai Pengemasan dan Suhu Penyimpanan. Laporan Akhir Penelitian Strategis Nasional Tahun Ke-2. FTIP Universitas Padjadjaran, Bandung.