Quality Attributes of Black Mulberry (Morus Nigra L.) Juice Treated with Ultraviolet Radiation
Keywords:
UV-C treatment, Black mulberry, Quality, Fruit juiceAbstract
After exposing the black mulberry juice to ultraviolet light with the intensity of 5, 10 and 20 kJ/m2, their quality analysis have been performed for 4 days at +4 °C and +25 °C. Within the current study the antioxidant activity, Total Phenolic Content (TPC), microbial charges and pH values of the samples have also been investigated. In the UV light exposed samples there existed no meaningful difference in the % DPPH radical scavenging activity level, a small amount of decrease has been detected in the TPC creation process. While the storage time worsens the DPPH activity, it affects the TPC positively. Microbial studies showed reduction in total mesophile aerobic microorganisms, yeasts and mould counts about by 1-log cycle on UV treatments. This is the first report on the effects of UV radiation on black mulberry.
References
Gundogdu, M, Muradoglu, F, Sensoy, RG, Yilmaz, H. “Determination of Fruit Chemical Properties of Morus nigra L. Morus alba L. and Morus rubra L. by HPLC”. Scientia Horticulturae 132(2011):37-41. shown no any difference. There are several reports as well mentioning about that the effect of the treatment of UV-C light on phenolic content and antioxidant capacity of other fruit juices. For example Noci et al., has concluded that the antioxidant capacity of furit juices exposed to UV-C light has not been effected whereas its total phenolic content was decreased to a certain extent with respect ot fresh fruit juices [19]. Temperature has no effect on TPC value for the first day, while the increase in storage time at room temperature raises the TPC amount. Depending on temperature, increase in microbial charge and maturity are thought to cause an increase in total phenolic content level. In literature it has been shown that the microbial fermentation can increase the phenolic content [20-22].
Ozrenk K, Gazioglu SR, Erdinc C, Guleryuz M, Aykanat A. “Molecular characterization of Mulberry Germplasm from Eastern Anatolia”. Afri J Biotechnol 9 (2010):001-006.
Diffey BL. “Sources And Measurement of Ultraviolet Radiation”. Methods 28(2002):4-13.
Keyser M, Müller IA, Cilliers FP, Nel W, Gowa PA. “Ultraviolet Radiation as a Non-Thermal Treatment for The Inactivation of Microorganisms in Fruit Juice”. IFSET 9 (2008):348-354.
Korkmaz A, Tiryaki-Gündüz,G. “Meyve ve Sebzelerde UV-C I−ık Uygulamaları ile Küf −nhibisyonu”. Akademik Gıda 16(2018):458-469.
Tran MTT, Farid M. “Ultraviolet Treatment of Orange Juice”. IFSET 5 (2004): 495-502.
Uysal-Pala C, Kırca-Toklucu A. “Microbial, Physicochemical and Sensory Properties of UV-C Processed Orange Juice and its Microbial Stability During Refrigerated Storage”. LWT - Food Sci and Technol 50 (2013): 426e431.
Chew SC, Ghazali HM, Martin-Belloso O, Noranizan MA. “Effects of Combining Ultraviolet and Mild Heat Treatments on Enzymatic Activities and Total Phenolic Contents in Pineapple Juice”. IFSET 26 (2014): 511-516.
Dhahir, N, Feugang, J, Witrick, K, Park, S, White, S, et al. “The Effect of Different Ultraviolet-C Light Doses on Microbial Reduction and the Components of Camel Milk”. Food Sci Technol Int 27(2020): 1082013220935230.
Singleton, VL, Rossi, JA. “Colorimetry of Total Phenolics with Phosphomolybdic-Phosphotungstic Acid Reagents”. Am J Enol Viticult 16 (1965): 144.
Blois MS. Antioxidant determinations by the use of a stable free radical. Nature 181(1958): 1199.
Öz AT, Ulukanlı Z. “The Effects of Calcium Chloride and 1-methylcyclopropene (1-mcp) on the Shelf life of mulberries (morus alba L.)”. J Food Process Pres 38 (2014):1279-1288.
Tabako−lu N, Karaca H. “Effects of Ozone-enriched Storage Atmosphere on Postharvest Quality of Black mulberry fruits (Morus nigra L.)”. LWT - Food Sci and Technol 92 (2018):276- 281.
Alothmon M, Bhat R, Karim AA. “UV Radiation-Induced Changes of Antioxidant Capacity of Fresh-Cut Tropical Fruits”. IFSET 10(2009): 512-516.
Jiang B, Mantri N, Hu Y, Lu J, Jiang W, Lu H. “Evaluation of Bioactive Compounds of Black Mulberry Juice After Thermal, Microwave, Ultrasonic Processing, and Storage at Different Temperatures”. Food Sci Technol Int 21(2015):392-399.
Lopez-Rubira V, Conesa A, Allende A, Aries F. Shelf Life and Overall Quality of Minimally Processed Pomegranate Arils Modified Atmosphere Packaged and Treated with UV-C. Postharvest Biol Tec 37 (2005): 174-185.
Noreen H, Semmar N, Farman M, McCullagh JSO. “Measurement of Total Phenolic Content and Antioxidant Activity of Aerial Parts of Medicinal Plant Coronopus didymus”. Asian Pac J Trop Med 10(2017): 792-801.
Semerci AB, −nceçayır D, Konca T, Tunca H, Tunç K. “Phenolic Constituents, Antioxidant and Antimicrobial Activities of Methanolic Extracts of Some Female Cones of Gymnosperm Plant”. Indian J Biochemi & Biophys 57(2020):298-303.
Noci F, Riener J, Walking-Ribeiro M, Cronin DA, Morgan DJ, et al. “Ultraviolet Irradiation and Pulsed Electric Fields (PEF) in a Hurdle Strategy for the Preservation of Fresh Apple Juice”. J Food Engineer 85 (2008):141-146.
Eom SH, Kang YM, Park JH, Yu DU, Jeong ET, et al. “Enhancement of Polyphenol Content and Antioxidant Activity of Brown Alga Eisenia bicyclis Extract by Microbial Fermentation”. Fish Aquat Sci 14(2011):192-197.
Wiyanti ED, Eka Setiawan NC, Cristi JP. “Effect of Lactic Acid Fermentation on Total Phenolic Content and Antioxidant Activity of Fig Fruit Juice (Ficus carica)”. Adv Health Sci Res 2(2017):282-292.
Ercisli S, Orhan E. Some Physico-chemical Characteristics of Black Mulberry (Morus nigra L.) Genotypes from Northeast Anatolia region of Turkey. Scientia Horticulturae 116(2008): 41-46.
