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Study of Combined Treatment for Damp-Harvested Maize: Gamma Irradiation and Drying by Controlled Ventilation; Etude d'un Traitement Combine pour le Conditionnement du Mais Recolte Humide: Irradiation Gamma et Sechage par Ventilation Controlee; Izuchenie kombinirovannoj obrabotki kukuruzy molochno-voskovoj spelosti; Estudio de un Tratamiento Combinado para el Acondicionamiento del Maiz Recolectado Humedo: Irradiacion Gamma y Secado por Ventilacion Controlada

Abstract

The purpose of combining the effects of gamma irradiation from {sup 60}Co and of slow drying by cool ventilation (10-25 Degree-Sign C) in storage chambers is to replace the standard technique of rapid drying with high temperature air by a treatment which is less likely to damage the grain and also disinfects at the microbiological level. In France, one million tons of damp maize are involved (1964); the problem is to be regarded as one of increasing importance both in Europe and in tropical countries. The authors first study the direct effect of gamma radiation on the yield and technical characteristics of the starch. The latter is extracted from the maize by a laboratory method which faithfully and accurately reproduces industrial conditions. Radiation doses of less than 500 krad are found to have no effect on the extraction yield, whereas drying at 74 Degree-Sign C lowers the yield by about 4% because of the partial coagulation of the protein network and the bursting of starch granules. The slight changes in structure of the irradiated starch are in most cases advantageous from the viewpoint of further treatment of the product. They may lead to the development of a test to ascertain  More>>
Authors:
Saint-Lebe, L.; Pelegrin, P.; [1]  Guilbot, A. [2] 
  1. Centre d'Etudes Nucleaires de Cadarache (France)
  2. Institut National de la Recherche Agronomique, Massy (France)
Publication Date:
Nov 15, 1966
Product Type:
Conference
Report Number:
IAEA-SM-73/47
Resource Relation:
Conference: International Symposium on Food Irradiation, Karlsruhe, Federal Republic of Germany (Germany), 6-10 Jun 1966; Other Information: 7 refs., 6 figs.; Related Information: In: Food Irradiation. Proceedings of the International Symposium on Food Irradiation| 979 p.
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; AIR FLOW; ANIMALS; BACTERIA; COBALT 60; DRYING; EXTRACTION; GAMMA RADIATION; IRRADIATION; MAIZE; PROTEINS; PUBLIC HEALTH; RADIATION DOSES; STARCH; VENTILATION
OSTI ID:
22118888
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); Food and Agricultural Organization of the United Nations, Rome (Italy)
Country of Origin:
IAEA
Language:
French
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M2052075524
Submitting Site:
INIS
Size:
page(s) 439-454
Announcement Date:
Aug 08, 2013

Citation Formats

Saint-Lebe, L., Pelegrin, P., and Guilbot, A. Study of Combined Treatment for Damp-Harvested Maize: Gamma Irradiation and Drying by Controlled Ventilation; Etude d'un Traitement Combine pour le Conditionnement du Mais Recolte Humide: Irradiation Gamma et Sechage par Ventilation Controlee; Izuchenie kombinirovannoj obrabotki kukuruzy molochno-voskovoj spelosti; Estudio de un Tratamiento Combinado para el Acondicionamiento del Maiz Recolectado Humedo: Irradiacion Gamma y Secado por Ventilacion Controlada. IAEA: N. p., 1966. Web.
Saint-Lebe, L., Pelegrin, P., & Guilbot, A. Study of Combined Treatment for Damp-Harvested Maize: Gamma Irradiation and Drying by Controlled Ventilation; Etude d'un Traitement Combine pour le Conditionnement du Mais Recolte Humide: Irradiation Gamma et Sechage par Ventilation Controlee; Izuchenie kombinirovannoj obrabotki kukuruzy molochno-voskovoj spelosti; Estudio de un Tratamiento Combinado para el Acondicionamiento del Maiz Recolectado Humedo: Irradiacion Gamma y Secado por Ventilacion Controlada. IAEA.
Saint-Lebe, L., Pelegrin, P., and Guilbot, A. 1966. "Study of Combined Treatment for Damp-Harvested Maize: Gamma Irradiation and Drying by Controlled Ventilation; Etude d'un Traitement Combine pour le Conditionnement du Mais Recolte Humide: Irradiation Gamma et Sechage par Ventilation Controlee; Izuchenie kombinirovannoj obrabotki kukuruzy molochno-voskovoj spelosti; Estudio de un Tratamiento Combinado para el Acondicionamiento del Maiz Recolectado Humedo: Irradiacion Gamma y Secado por Ventilacion Controlada." IAEA.
@misc{etde_22118888,
title = {Study of Combined Treatment for Damp-Harvested Maize: Gamma Irradiation and Drying by Controlled Ventilation; Etude d'un Traitement Combine pour le Conditionnement du Mais Recolte Humide: Irradiation Gamma et Sechage par Ventilation Controlee; Izuchenie kombinirovannoj obrabotki kukuruzy molochno-voskovoj spelosti; Estudio de un Tratamiento Combinado para el Acondicionamiento del Maiz Recolectado Humedo: Irradiacion Gamma y Secado por Ventilacion Controlada}
author = {Saint-Lebe, L., Pelegrin, P., and Guilbot, A.}
abstractNote = {The purpose of combining the effects of gamma irradiation from {sup 60}Co and of slow drying by cool ventilation (10-25 Degree-Sign C) in storage chambers is to replace the standard technique of rapid drying with high temperature air by a treatment which is less likely to damage the grain and also disinfects at the microbiological level. In France, one million tons of damp maize are involved (1964); the problem is to be regarded as one of increasing importance both in Europe and in tropical countries. The authors first study the direct effect of gamma radiation on the yield and technical characteristics of the starch. The latter is extracted from the maize by a laboratory method which faithfully and accurately reproduces industrial conditions. Radiation doses of less than 500 krad are found to have no effect on the extraction yield, whereas drying at 74 Degree-Sign C lowers the yield by about 4% because of the partial coagulation of the protein network and the bursting of starch granules. The slight changes in structure of the irradiated starch are in most cases advantageous from the viewpoint of further treatment of the product. They may lead to the development of a test to ascertain whether the starch or the maize have been irradiated. Microbiological analysis techniques suitable for defining the optimum conditions for radiopasteuriz- ation of maize in relation to the environment were developed. Armed with these data, the authors attacked the problem of combined irradiation-ventilation treatment on a laboratory scale under experimental conditions easy to transpose to the industrial level. They studied the microbiological and biochemical changes occurring in the fraction of moist grains reached last by the drying air flow, which corresponds to the most unfavourable case. From a quantitative point of view, it appears that in this zone the depressive effect of radiation on the mycoflora persists even after 26 days, and the effect on bacteria is even more pronounced. From the qualitative point of view, the mycoflora which regenerates first is specifically sensitive to the dry air flow which will reach it. Industrial applications are envisaged, but before going on to the pilot stage, which is indispensable for establishing costs, the biochemical investigations must be taken further. The public health aspect must also be studied in case the process finds a use in the field of animal or human feeding. (author) [French] L'association des effets d'une irradiation gamma au cobalt-60 et d'un sechage lent par ventilation froide (10 a 25 Degree-Sign C) dans les cellules de stockage a pour but de substituer a la solution classique de sechage rapide.avec de l'air porte a haute temperature un traitement qui respecte davantage l'integrite du grain et se traduit en meme temps par un assainissement sur le plan microbiologique. Ce probleme concerne en France un million de tonnes de maies humide (1964); il doit revetir une importance croissante tant en Europe que dans les pays de la zone tropicale. Les auteurs etudient d'abord l'incidence directe du rayonnement gamma sur le rendement et les caracteristiques techniques de l'amidon. Celui-ci est extrait du mais par une methode de laboratoire qui reproduit de maniere fidele et precise les conditions industrielles. On trouve qu'un dose d'irradiation inferieure a 500 krad est sans influence sur le rendement d'extraction, alors qu'un sechage a la temperature de 74 Degree-Sign C diminue deja ce rendement d'environ 4%, en raison de la coagulation partielle de la trame proteique et de l'eclatement de granules d'amidon. Les faibles modifications de structure de l'amidon irradie sont dans la plupart des cas favprables du point de vue du traitement ulterieur du produit. Elles peuvent conduire a la mise au point d'un test permettant de savoir si l'amidon ou le maies ont ete irradies. Des techniques d'analyses microbiologiques ont ete mises au point dans le but de definir, en fonction du milieu, les conditions optimales de la radiopasteurisation du maies. En possession de ces donnees les auteurs abordent a l'echelle du laboratoire le probleme du traitement combine irradiation-ventilation, dans des conditions experimentales faciles a transposer sur le plan industriel. Ils etudient les modifications microbiologiques et biochimiques qui se produisent dans la fraction des grains humides atteinte en dernier par le flux d'air sechant, ce qui correspond au cas le plus defavorable. D'un point de vue quantitatif, il apparait dans cette zone que l'effet depressif de l'irradiation sur la mycoflore persiste meme apres 26 jours; cet effet est encore plus important sur les bacteries. D'un point de vue qualitatif, on observe la regeneration prioritaire d'une mycoflore precisement sensible au flux d'air sec qui doit l'atteindre. Des applications industrielles sont en vue; mais, avant de passer au stade pilote, phase indispensable a retablissement d'un prix de revient, il est necessaire de mener plus avant des investigations biochimiques. De meme, le point de vue de la sante publique ne devra pas etre neglige pour le cas ou le procede trouverait une application dans le domaine de l'alimentation animale ou humaine. (author) [Spanish] La asociacion de los efectos de la irradiacion gamma con cobalto-60 y del secado lento por ventilacion en frio (10 a 25 Degree-Sign C) en las celdas de almacenamiento se practica con el fin de hallar un sustitutivo a la solucion clasica de secado rapido con aire calentado a alta temperatura, pues el primer tratamiento es mas apropiado para mantener la integridad del grano'y ejerce al mismo tiempo un efecto purificador desde el punto de vista microbiologico. Este problema afecta en Francia a un millon de toneladas de maiz humedo (1964) y cobrara cada vez mas importancia tanto en Europa como en los paises de la zona tropical. Los autores estudian primero la influencia directa de las radiaciones gamma sobre el rendimiento y las caracteristicas tecnicas del almidon. Este se extrae del maiz por un metodo de laboratorio que reproduce de manera fiel y precisa las condiciones industriales. Se observa que .una dosis de irradiacion inferior a 500 krad no influye en el rendimiento de extraccion, mientras que un secado a la temperatura de 74 Degree-Sign C reduce dicho rendimiento en un 4% debido a la coagulacion parcial de la estructura proteica y a la rotura de los granulos de almidon. Las ligeras modificaciones de la estructura del almidon irradiado son, en la mayor parte de los casos, favorables desde el punto de vista del tratamiento ulterior del producto. Tal vez sea posible idear, basandose en ellas, una prueba que permita saber si el almidon o el maiz han sido irradiados. Se han elaborado tecnicas de analisis microbiologico para definir, en funcion del medio, las condiciones optimas de radiopasteurizacion del maiz. Conociendo estos datos, los autores abordan el estudio en laboratorio del problema del tratamiento combinado por irradiacion-ventilacion, en condiciones experimentales facilmente adaptables a la industria. Estudian las modificaciones microbiologicas y bioquimicas que se producen en la fraccion de grano humedo que es la ultima en ser alcanzada por el flujo de aire seco, lo que corresponde al caso mas desfavorable. Desde el punto de vista cuantitativo, parece que en esta-zona el efecto restrictivo de la irradiacion sobre la micoflora persiste incluso al cabo de 26 dias; este efecto es aun mas importante sobre las bacterias. Desde el punto de vista cualitativo, se observa la regeneracion prioritaria de la micoflora precisamente sensible al flujo de aire seco a que va a estar sometida. Se preven aplicaciones industriales, pero antes de pasar a la fase experimental, indispensable para determinar el precio de costo, es preciso profundizar mas en las investigaciones bioquimicas. Asimismo, conviene no descuidar el punto de vista de la sanidad publica para el caso en que el procedimiento pudiese aplicarse a la alimentacion animal o humana. (author) [Russian] Sovmeshhenie jeffektov gamma-obluchenija kobal'ta-60 i medlennoj sushki s pomoshh'ju holodnoj ventiljacii (10-25 Degree-Sign S) v skladskih pomeshhenijah imeet cel'ju zamenit' obychnuju bystruju sushku pri pomoshhi nagretogo do vysokoj temperatury vozduha obrabotkoj, kotoraja obespechivaet celostnost' zerna i ochistku v mikrobiologicheskom plane. Jeta problema zatragivaet vo Francii million tonn kukuruzy molochno-voskovoj spelosti (1964 god) i priobretaet vse bol'shee znachenie kak dlja stran Evropy, tak i dlja stran tropicheskoj zony. Avtory rassmatrivajut snachala prjamye posledstvija gamma-obluchenija na proizvoditel'nost' i tehnicheskie dannye krahmala. Krahmal jekstragiruetsja iz kukuruzy laboratornym metodom, kotoryj pochti polnost'ju sootvetstvuet promyshlennym uslovijam. Ustanovleno, chto doza obluchenija, men'she 500 kilorad, ne okazyvaet vlijanija na jekstrakcionnuju sposobnost', v to vremja kak sushka pri temperature v 74 Degree-Sign S snizhaet jetu sposobnost' primerno na 4% vvidu chastichnoj koaguljacii bystromenjajushhejsja tkani i razryva zeren krahmala. Slabye strukturnye izmenenija v obluchennom krahmale v bol'shinstve sluchaev blagoprijatny s tochki zrenija dal'nejshej obrabotki produkta. Jeti izmenenija mogut privesti k provedeniju ispytanija, kotoroe pozvolit opredelit', obluchalis' li krahmal ili kukuruza. Byli pa3pa6oTaHbi metody provedenija sootvetstvujushhih mikrobiologicheskih analizov s cel'ju opredelit' v zavisimosti ot sredy optimal'nye uslovija radiopasterizacii kukuruzy. Raspolagaja jetimi dannymi, avtory pristupili v laboratorii k rassmotreniju problemy kombinirovannoj obrabotki putem obluchenija-ventiljacii pri jeksperimental'nyh uslovijah, kotorye legko perevesti na promyshlennye rel'sy. Oni izuchajut mikrobiologicheskie i biohimicheskie izmenenija, kotorye proishodjat vo frakcii zeren molochno-voskovoj spelosti, podvergajushhejsja dejstviju vysushivajushhego vozdushnogo potoka, t.e. pri samom neblagoprijatnom sluchae. V kolichestvennom otnoshenii okazyvaetsja, chto podavljajushhee dejstvie obluchenija na mikofloru v jetoj zone uderzhivaetsja dazhe posle 26 dnej. Jeto dejstvie javljaetsja bolee znachitel'nym dlja bakterij. V kachestvennom otnoshenii nabljudaetsja pervoocherednaja regeneracija mikoflory, osobenno chuvstvitel'noj k potoku suhogo vozduha. Imeetsja v vidu promyshlennoe primenenie jetih metodov. No prezhde chem perejti k stadii polupromyshlennogo proizvodstva, kotoroe neobhodimo dlja opredelenija sebestoimosti, trebuetsja zaranee provesti biohimicheskie issledovanija. Takim obrazom, tochka zrenija zdravoohranenija dolzhna uchityvat'sja, kogda jetot metod najdet primenenie v oblasti pitanija zhivotnyh i ljudjoj. (author)}
place = {IAEA}
year = {1966}
month = {Nov}
}