Post harvest Spoilage of Mangoes by Penicillium cyclopium and its Control by Gamma-Radiation and a Fungicide

1985 ◽  
Vol 112 (1) ◽  
pp. 63-68 ◽  
Author(s):  
V. A. Palejwala ◽  
V. V. Modi
Author(s):  
MARIA APARECIDA COSTA ◽  
VALDEMAR LUIZ TORNISIELO ◽  
JULIO MARCOS MELGES WALDER

O objetivo deste trabalho foi avaliar os níveis residuais de Prochloraz aplicado em mangas, na pré e pós-colheita após o tratamento com radiação. Os frutos foram submetidos à radiação gama na dose de 1,0 kGy visando verificar se a mesma induziu a degradação do fungicida. As mangas tratadas na pós-colheita foram armazenadas por 21 dias a 12 °C. Os resíduos de Prochloraz não apresentaram decréscimo durante o período de carência (21 dias) estabelecido pela Legislação Brasileira de Agrotóxicos. O armazenamento refrigerado (12 °C) e a irradiação gama também não contribuíram para a degradação do fungicida. O Prochloraz ficou retido principalmente na casca (média = 1,64 µg/g), que funcionou como barreira à contaminação da polpa (média = 0,06 µg/g). O produto de degradação, formado nas cascas das mangas tratadas na pós-colheita, foi identificado como sendo o BTS 44596. Os metabólitos, encontrados em níveis baixos, confirmaram a ocorrência de baixa degradação do fungicida em mangas. 14C-PROCHLORAZ RESIDUES IN IRRADIATED MANGOES Abstract The aim of this work was to evaluate the Prochloraz residual levels applied in mangoes, in pre and post-harvest after radiation treatment. The fruits were submitted to gamma radiation with of 1,0 kGy dose, aiming to verify if it induces the fungicide degradation. Treated post-harvest mangoes were stored, at 12 0C during 21 days. Prochloraz residues did not present reduction after safe period (21 days), established by the Brazilian legislation on agrochemicals. The refrigerated storage (12 0C) and the gamma radiation also did not contribute to the degradation of the fungicide. Prochloraz was mainly retained in the peels (mean = 1,64 µg/g) which served as barrier to the pulp (mean = 0,06 µg/g) contamination. The degradation product, formed in peels of post-harvest treated mangoes was the metabolite BTS 44596. The metabolites found in very low levels, confirm that low fungicide degradation occurs in mangoes.


2016 ◽  
Vol 36 ◽  
pp. 1-9 ◽  
Author(s):  
Duarte Guerreiro ◽  
Joana Madureira ◽  
Telma Silva ◽  
Rita Melo ◽  
Pedro M.P. Santos ◽  
...  

2012 ◽  
Vol 81 (6) ◽  
pp. 666-671 ◽  
Author(s):  
Hossein Ahari Mostafavi ◽  
Seyed Mahyar Mirmajlessi ◽  
Seyed Mohammad Mirjalili ◽  
Hadi Fathollahi ◽  
Hadi Askari

LWT ◽  
2020 ◽  
Vol 118 ◽  
pp. 108805 ◽  
Author(s):  
A. Berrios-Rodriguez ◽  
O.M. Olanya ◽  
D.O. Ukuku ◽  
B.A. Niemira ◽  
L.E. Orellana ◽  
...  

Author(s):  
K. Cowden ◽  
B. Giammara ◽  
T. Devine ◽  
J. Hanker

Plaster of Paris (calcium sulfate hemihydrate, CaSO4. ½ H2O) has been used as a biomedical implant material since 1892. One of the primary limiting factors of these implants is their mechanical properties. These materials have low compressive and tensile strengths when compared to normal bone. These are important limiting factors where large biomechanical forces exist. Previous work has suggested that sterilization techniques could affect the implant’s strength. A study of plaster of Paris implant mechanical and physical properties to find optimum sterilization techniques therefore, could lead to a significant increase in their application and promise for future use as hard tissue prosthetic materials.USG Medical Grade Calcium Sulfate Hemihydrate Types A, A-1 and B, were sterilized by dry heat and by gamma radiation. Types A and B were additionally sterilized with and without the setting agent potassium sulfate (K2SO4). The plaster mixtures were then moistened with a minimum amount of water and formed into disks (.339 in. diameter x .053 in. deep) in polyethylene molds with a microspatula. After drying, the disks were fractured with a Stokes Hardness Tester. The compressive strengths of the disks were obtained directly from the hardness tester. Values for the maximum tensile strengths σo were then calculated: where (P = applied compression, D = disk diameter, and t = disk thickness). Plaster disks (types A and B) that contained no setting agent showed a significant loss in strength with either dry heat or gamma radiation sterilization. Those that contained potassium sulfate (K2SO4) did not show a significant loss in strength with either sterilization technique. In all comparisons (with and without K2SO4 and with either dry heat or gamma radiation sterilization) the type B plaster had higher compressive and tensile strengths than that of the type A plaster. The type A-1 plaster however, which is specially modified for accelerated setting, was comparable to that of type B with K2SO4 in both compressive and tensile strength (Table 1).


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