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Review of the Status of Irradiation Effects on Citrus Fruits; Analyse des Effets de l'Irradiation sur les Agrumes; Obzor vliyaniya oblucheniya na plody tsitrusovykh; Examen de los Efectos de la Irradiacion en los Agrios

Conference:

Abstract

The United States fresh-market spoilage losses valued at the 1959-1963 retail prices were estimated for oranges and grapefruit to be $8.4 and $5.4 million, respectively. Stem-end rots and green and blue molds cause the greatest post-harvest decay losses to citrus. No single radiation dose can be given that will be the minimum required for protecting citrus fruits against spoilage. Radiation doses required for retarding old or established infections are higher than for the retardation of incipient infections. The flux, as well as the dose of gamma radiation influences the control of infections. Fresh citrus fruits undergo metabolic changes which ultimately lead to senescence. Some of these changes include varied activities in the levels of respiration, organic acids, sugars, pectic substances and color. In many respects the loss of cellular vitality in senescence resembles the effects of radiation injury. Irradiation causes changes in the pectic components of fruits. In general, an increase occurs in the water and ammonium oxalate-soluble fractions and a decrease occurs in the sodium hydroxide-soluble fraction. A large increase of water-soluble pectin is found in the juice extracted from irradiated fruits. Apparently this increases results from movement of the water-soluble pectin from other parts of the fruit. A  More>>
Authors:
Dennison, R. A.; Ahmed, E. M. [1] 
  1. University of Florida, Gainesville, FL (United States)
Publication Date:
Nov 15, 1966
Product Type:
Conference
Report Number:
IAEA-SM-73/24
Resource Relation:
Conference: International Symposium on Food Irradiation, Karlsruhe, Federal Republic of Germany (Germany), 6-10 Jun 1966; Other Information: 62 refs., 8 tabs., 6 figs.; Related Information: In: Food Irradiation. Proceedings of the International Symposium on Food Irradiation| 979 p.
Subject:
60 APPLIED LIFE SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; CITRUS; CONTROL; FUNGI; GAMMA RADIATION; GRAPEFRUITS; IRRADIATION; ORANGES; ORGANIC ACIDS; PECTINS; RADIATION DOSES; RADIATION INJURIES; RETAIL PRICES; SACCHAROSE; SODIUM HYDROXIDES
OSTI ID:
22118900
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Food and Agricultural Organization of the United Nations, Rome (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M2064075536
Submitting Site:
INIS
Size:
page(s) 619-633
Announcement Date:
Aug 08, 2013

Conference:

Citation Formats

Dennison, R. A., and Ahmed, E. M. Review of the Status of Irradiation Effects on Citrus Fruits; Analyse des Effets de l'Irradiation sur les Agrumes; Obzor vliyaniya oblucheniya na plody tsitrusovykh; Examen de los Efectos de la Irradiacion en los Agrios. IAEA: N. p., 1966. Web.
Dennison, R. A., & Ahmed, E. M. Review of the Status of Irradiation Effects on Citrus Fruits; Analyse des Effets de l'Irradiation sur les Agrumes; Obzor vliyaniya oblucheniya na plody tsitrusovykh; Examen de los Efectos de la Irradiacion en los Agrios. IAEA.
Dennison, R. A., and Ahmed, E. M. 1966. "Review of the Status of Irradiation Effects on Citrus Fruits; Analyse des Effets de l'Irradiation sur les Agrumes; Obzor vliyaniya oblucheniya na plody tsitrusovykh; Examen de los Efectos de la Irradiacion en los Agrios." IAEA.
@misc{etde_22118900,
title = {Review of the Status of Irradiation Effects on Citrus Fruits; Analyse des Effets de l'Irradiation sur les Agrumes; Obzor vliyaniya oblucheniya na plody tsitrusovykh; Examen de los Efectos de la Irradiacion en los Agrios}
author = {Dennison, R. A., and Ahmed, E. M.}
abstractNote = {The United States fresh-market spoilage losses valued at the 1959-1963 retail prices were estimated for oranges and grapefruit to be $8.4 and $5.4 million, respectively. Stem-end rots and green and blue molds cause the greatest post-harvest decay losses to citrus. No single radiation dose can be given that will be the minimum required for protecting citrus fruits against spoilage. Radiation doses required for retarding old or established infections are higher than for the retardation of incipient infections. The flux, as well as the dose of gamma radiation influences the control of infections. Fresh citrus fruits undergo metabolic changes which ultimately lead to senescence. Some of these changes include varied activities in the levels of respiration, organic acids, sugars, pectic substances and color. In many respects the loss of cellular vitality in senescence resembles the effects of radiation injury. Irradiation causes changes in the pectic components of fruits. In general, an increase occurs in the water and ammonium oxalate-soluble fractions and a decrease occurs in the sodium hydroxide-soluble fraction. A large increase of water-soluble pectin is found in the juice extracted from irradiated fruits. Apparently this increases results from movement of the water-soluble pectin from other parts of the fruit. A marked increase in the viscosity of the juice results. Peel injury is sometimes found following irradiation and storage of the fruit. The per centage of fruit showing peel injury, and the severity of the injury, increase the higher the storage temperature and the longer the storage duration. Oranges and grapefruit may be irradiated with doses of up to 200 krad without any appreciable deleterious effects on organoleptic qualities. (author) [French] Les pertes d'agrumes dues aux dechets sur le marche des fruits frais aux Etats-Unis, calculees sur la base des prix de vente au detail pour la periode 1959-1963, ont ete evaluees a 8,4 et 5,4 millions de dollars pour les oranges et les pamplemousses, respectivement. La pourriture du point d'attache du fruit et les moisissures vertes et bleues sont la cause des plus grandes pertes d'agrumes par deterioration apres la recolte. On ne peut delivrer aucune dose de rayonnement constituant le minimum necessaire pour empecher les agrumes de se deteriorer. Les doses de rayonnement necessaires pour ralentir l'evolution des infections anciennes ou deja formees sont plus elevees que celles qu'il faut delivrer pour retarder l'apparition d'infections. Le flux et la dose de rayonnement gamma ont une influence sur le controle des infections. Les agrumes frais subissent des modifications metaboliques qui conduisent finalement a la senescence; on peut mentionner notamment les differences d'activite respiratoire, de teneur en acides organiques, en sucres et en substances pectiques et de coloration. A maints egards, la perte de vitalite cellulaire due a la senescence ressemble aux effets des radiolesions. L'irradiation produit des modifications dans les composants pectiques des fruits. En general' il se produit un accroissement dans les parties solubles dans l'eau et l'oxalate d'ammonium et une decroissance dans la partie soluble dans l'hydrate de sodium. Dans le jus extrait des fruits irradies, on constate un accroissement important de la pectine soluble dans l'eau. Il semble que ce phenomene resulte de la translocation, des autres parties du fruit, de la pectine soluble dans l'eau. Il s'ensuit un accroissement marque de la viscosite du jus. On constate parfois des lesions cutanees a la suite de l'irradiation et du stockage du fruit. La proportion des fruits atteints de lesions cutanees et la gravite des lesions augmentent en fonction de la temperature et de la duree du stockage. On peut irradier les oranges et les pamplemousses a des doses atteignant 200 krad sans que les qualites organoleptiques en soient affectees defavorablement de facon sensible. (author) [Spanish] Sobre la base de los precios de venta al por menor corrientes en 1959-1963, se ha calculado que en los Estados Unidos las perdidas por deterioro de naranjas y pomelos ascienden a 8,4 y 5,4 millones de dolares, respectivamente. La putrefaccion del pedunculo y las prodredumbres verde y cardena son las que causan mayores perdidas por descomposicion en los agrios despues de la recoleccion. No es posible administrar una sola dosis de irradiacion que baste para proteger a los agrios contra la descomposicion. Para retardar infecciones antiguas o arraigadas se necesitan dosis de irradiacion mayores que para retardar las infecciones incipientes. En la lucha contra las infecciones por irradiacion gamma influye tanto la intensidad del flujo como la magnitud de la dosis. Los agrios frescos sufren alteraciones metabolicas que terminan por provocar la senescencia. En algunos casos, estas alteraciones comprenden variaciones de la actividad respiratoria, del contenido de acidos organicos, azucares y sustancias icticas, asi como de la coloracion. Los efectos de los danos producidos por las radiaciones son parecidos en muchos aspectos a la perdida de vitalidad celular en la senescencia. La irradiacion produce modificaciones en los componentes pecticos de los frutos. En general, aumentan las fracciones de agua y de oxalato amonico soluble y disminuye la fraccion de hidroxido sodico soluble. El zumo exprimido de frutos irradiados presenta un gran aumento de la pectina soluble en agua. Al parecer, este aumento se debe a la afluencia de pectina soluble en agua proveniente de otras partes del fruto. El resultado es un neto incremento de la viscosidad del zumo. A raiz de la irradiacion y almacenamiento del fruto se observan a veces lesiones de la piel. La proporcion de frutos que presentan estas lesiones y la gravedad de las mismas aumentan con la temperatura y la duracion del almacenamiento. Las naranjas y los pomelos pueden irradiarse con dosis de hasta 200 krad sin que se aprecien efectos perjudiciales en sus propiedades organolepticas. (author) [Russian] Ubytki v rezul'tate porchi svezhih apel'sinov i grejpfrutov v SShA ocenivalis' sootvetstvenno v 8,4 i 5,4 mln. dollarov v roznichnyh cenah 1959-1963 gg. Zagnivanie konca steblja i zelenaja i golubaja plesen' vyzyvajut samye bol'shie poteri citrusovyh posle ih sbora. Nel'zja nazyvat' kakuju-libo odnu dozu obluchenija, kotoraja javljalas' by minimumom, neobhodimym dlja zashhity plodov citrusovyh ot porchi. Dlja priostanovki dejstvija staryh ili ustanovivshihsja infekcij trebujutsja bolee vysokie dozy obluchenija, chem dlja priostanovki nachinajushhihsja infekcij. Dlja bor'by s infekcijami imejut znachenie potok, a takzhe doza gamma-izluchenija. Svezhie plody citrusovyh preterpevajut metabolicheskie izmenenija, kotorye v konechnom itoge privodjat k stareniju. Nekotorye iz jetih izmenenij svjazany s dyhaniem, organicheskimi kislotami, saharami, pektinovymi veshhestvami i cvetom. Vo mnogih otnoshenijah utrata kletkami zhiznesposobnosti pri starenii napominaet jeffekty radiacionnogo porazhenija. Obluchenie vyzyvaet izmenenija v pektinovyh veshhestvah fruktov. V osnovnom, proishodit uvelichenie frakcij, rastvorimyh v vode i v oksalate ammonija, i umen'shenie frakcii, rastvorimoj v gidrookisi natrija. Bol'shoe uvelichenie rastvorimogo v vode pektina obnaruzheno v soke, poluchennom iz obluchennyh fruktov. Po-vidimomu, jeto uvelichenie javljaetsja rezul'tatom peremeshhenija rastvorimogo v vode pektina iz drugih chastej fruktov. Jeto privodit k zametnomu uvelicheniju vjazkosti soka. Inogda posle obluchenija i hranenija fruktov obnaruzhivaetsja povrezhdenie kozhicy. Procent plodov s povrezhdennoj kozhicej i stepen' takogo povrezhdenija tem bol'she, chem vyshe temperatura hranenija i bol'she prodolzhitel'nost' hranenija. Obluchenie apel'sinov i grejpfrutov dozami do 200 krad ne vyzyvaet kakih-libo zametnyh vrednyh izmenenij organolepticheskih kachestv. (author)}
place = {IAEA}
year = {1966}
month = {Nov}
}