Novel postharvest management using laser irradiation to maintain the quality of strawberry
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ORIGINAL PAPER
Novel postharvest management using laser irradiation to maintain the quality of strawberry Liela Mohamed Ali1 · Sherif Saied Saleh2 · Abd El‑Rahman Abd El‑Raouf Ahmed1 · Helmy El‑Sayed Hasan3 · Ahmed El‑Raie Emam Suliman4 Received: 8 May 2020 / Accepted: 3 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Strawberry fruits are perishable fruits and deteriorate vastly after harvest. This study aimed to maintain the quality attributes of strawberry fruit during seven days of cold storage using diode laser irradiation. Strawberries (Fragaria × ananassa, cv. Festival) were irradiated with diode laser at wavelength of 450 nm and light intensity of 1.3 mWcm−2 for 3, 6, and 12 min, while the non-irradiated fruits served as the control sample, then the fruit was packed and stored for 7 days at 10 °C and 85–90% relative humidity. The findings showed a significant reduction in weight loss and decay percentages of treated strawberries with 3 and 6 min of laser light, while control and 12 min laser irradiated samples exhibited the highest significant increase in weight loss and fungal decay. All laser treatments retained firmness of the flesh until the fifth day of storage, meanwhile the control sample became softer and fully mature, and at the end of the storage period, the control sample lost 77.9% of the firmness compared to 9.94% of 3 min treated fruit. Laser light had a marginal effect on pH, titratable acidity, and the content of anthocyanin. The results revealed that low exposure duration of laser treatment decreased darkness, and Chroma and total soluble solids (TSS) were maintained. Vitamin C showed a slight increase for all treatments and by the end of the storage period, the 3 min treated sample had the highest significant value of 73.04 mg/100 g compared to the lowest significant value of 65.86 mg/100 g of control. It was noticed that laser irradiation significantly reduced the reduction percentage of antioxidant activity compared to the control sample even with the highest exposure time of laser irradiation. Keywords Strawberry fruit · Diode laser · Fungal decay · Ascorbic acid
Introduction Strawberry fruit (Fragaria × ananassa) in the Rosaceae family is a rich source of nutritive compounds such as vitamin B6, vitamin K, vitamin A, vitamin E, and vitamin C [1]. The average content of ascorbic acid (vitamin C) is 60 mg/100 g, considered to be one of the highest among other fruits [2]. Health-promoting effects of strawberry are * Liela Mohamed Ali [email protected]; [email protected] 1
Agricultural Engineering Research Institute, Agricultural Research Center, Dokki, P.O. Box 256, Giza 12611, Egypt
2
Medicinal and Aromatic Dept., Horticultural Research Institute, Agricultural Research Center, Giza, Egypt
3
National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt
4
Agricultural Engineering Dept., Faculty of Agriculture, Cairo University, Giza, Egypt
the result of phytochemicals such as anthocyanin, flavonoi
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