Irradiation of Mangoes. I. Radiation‐induced Delay in Ripening of Alphonso Mangoes

Abstract

SUMMARY Extension of storage life of unripe and mature Alphonse mangoes could he achieved at an optimum dose of 25 krads when irradiated under air, nitrogen, or carbon dioxide. Nitrogen atmosphere during irradiation is of some advantage in minimizing changes in organoleptic quality, ascorbic acid, and carotenoids, and at the same time allowing the least spoilage of fruit. Judging from skin color and fruit firmness, a six‐day delay in ripening could be expected in fruits irradiated with 25 krads under nitrogen or air. Radiation effect on fruit skin is more prominent in terms of inhibition in chlorophyll disappearance and earotenoid formation than in ripening changes in the meat of the fruit.

Lenticel discolouration on 'B74' mango fruit and under-skin browning on 'Honey Gold' mango fruit

“…Similar effects on skin colour of 1.0 kGy irradiation on ‗Tommy Atkin' mango fruit (Sabato et al, 2009), 0.25 kGy irradiation on ‗Alphonso' mango fruit (Dharkar et al, 1966) and 0.2 kGy irradiation on ‗Kensington Pride' mango fruit were observed. It may be that irradiation suppresses the synthesis or activity of enzyme systems involved in the regulation of chlorophyll breakdown (Boag et al, 1990).…”

Mango

“…The response of mango fruit to irradiation depends upon cultivar, maturity status and post-harvest handling system (Akamine & Moy 1983;Boag et al 1990;Gonzalez-Aguilar et al 2001;Janave & Sharma 2005;Moreno et al 2006;Spalding & Von Windeguth 1988;Thomas 1986;Thomas & Janave 1975;Uthairatanakij et al 2006). Irradiation of mature green 'Alphonso' mangoes with a dose of 250 Gy delayed ripening to 16 days against 10 days in control as evidenced by fruit texture and skin colour (Dharkar et al 1966). Deleterious effects on the skin, such as lenticel spotting and darkening, were observed with higher doses of irradiation (500 to 2000 Gy), but these could be negated by equilibrating the fruit in nitrogen for 3 hours before treatment followed by irradiation in the same atmosphere (Dharkar et al 1966).…”

“…Irradiation of mature green 'Alphonso' mangoes with a dose of 250 Gy delayed ripening to 16 days against 10 days in control as evidenced by fruit texture and skin colour (Dharkar et al 1966). Deleterious effects on the skin, such as lenticel spotting and darkening, were observed with higher doses of irradiation (500 to 2000 Gy), but these could be negated by equilibrating the fruit in nitrogen for 3 hours before treatment followed by irradiation in the same atmosphere (Dharkar et al 1966). Similarly, irradiation with ≥ 250 Gy increased skin scald and internal breakdown in mature green 'Keitt' and 'Tommy Atkins' mangoes.…”

“…Irradiation influences respiratory behaviour of mangoes (Boag et al 1990;Dharkar et al 1966). Thomas (1993) reported that there was a transient increase in the respiration rate of mangoes immediately after irradiation which could possibly be an implication of stress response.…”

Efecto de la composición de recubrimientos comestibles a base de hidroxipropilmetilcelulosa y cera de abeja en la calidad de ciruelas, naranjas y mandarinas.

“…La aplicación de radiaciones ionizantes en postcosecha tiene por objeto la desinfestación de plagas por destrucción de larvas y huevos (Hallman, 1999), la inactivación de organismos patógenos (Gladon et al, 1997) y la reducción del metabolismo del fruto, disminuyendo la actividad respiratoria, la síntesis de etileno y la pérdida de agua (Dharkar et al, 1966;Maxie et al, 1966;Dharkar y Sreenivasan, 1971;Lu et al, 1991). Algunos trabajos muestran la aptitud de esta técnica para mejorar y alargar la conservación de ciertas frutas y hortalizas (O'Beirne, 1991;Yu et al, 1995;Gladon et al, 1997;El-Samahy et al, 2000;Martínez-Solano et al, 2001).…”