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Paddy rice stored under hermetic conditions: The effect of relative humidity, temperature and storage time in suppressing Sitophilus zeamais and impact on rice quality

2019Journal article Open access
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dc.contributor.authorCarvalho, Maria Otilia
dc.contributor.authorFradinho, Patrícia
dc.contributor.authorMartins, M.João
dc.contributor.authorMagro, Ana
dc.contributor.authorRaymundo, Anabela
dc.contributor.authorSousa, Isabel
dc.date.accessioned2021-09-15T10:23:24Z
dc.date.available2021-09-15T10:23:24Z
dc.date.issued2019
dc.description.abstractThe aim of this study was to analyse the effect of relative humidity in suppressing Sitophilus zeamais, in paddy rice stored under hermetic conditions, during four and seven months, at different average temperatures, as well as the impact on rice quality. Hermetic bags, GrainPro® SuperGrainbag® Farm™, were used to store two rice varieties under three different relative humidities: 67%, 75% and 85% RH, and average temperatures of 14 C, 17 C and 24 C, both monitored by Hobo® Data loggers, with the probe placed inside the bags. CheckpointII Portable O2 and CO2 Gas Analyzer was used to assess gas contents on the top and bottom of each bag. At the end of the trials, paddy samples were collected to estimate water activity (aw). The rheology behaviour of rice pastes prepared with race flour obtained from the different treatments was also evaluated, using a controlled stress rheometer. The results showed that the response of the stored-product insects changes with environmental conditions, O2 and CO2 contents. Other parameters were considered; aw increased with relative humidity and temperature, but decreased with storage time. The relative humidity played an important role, together with the increase of temperature, in suppressing insect populations. A modified atmosphere was naturally produced inside the hermetic bag, under 85% RH, with low O2 and high CO2 contents, at different average temperatures, 14 C and 17 C. These results demonstrated that S. zeamais can survive, but has no progeny. Under the same conditions, but at the higher average temperature of 24 C, S. zeamais attained 100% mortality before producing progeny. The increase on respiration rate, registered by CO2 increase and O2 decrease, for higher RH values, reduced the viscoelastic functions and changed the starch gelatinization point of Indica and Japonica rice. The results obtained showed that storing paddy hermetically, at low relative humidity, did not change atmospheric content and maintained the viscoelastic functions of the rice pastespt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationJournal of Stored Products Research 80 (2019) 21-27pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.jspr.2018.11.002pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.5/21824
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCOST Action CA15118pt_PT
dc.relationLinking Landscape, Environment, Agriculture and Food
dc.relationForest Research Centre
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectpaddypt_PT
dc.subjecthermetic storagept_PT
dc.subjectSitophilus zeamaispt_PT
dc.subjectrheologypt_PT
dc.titlePaddy rice stored under hermetic conditions: The effect of relative humidity, temperature and storage time in suppressing Sitophilus zeamais and impact on rice qualitypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLinking Landscape, Environment, Agriculture and Food
oaire.awardTitleForest Research Centre
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FAGR%2F04129%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FAGR%2F00239%2F2013/PT
oaire.citation.titleJournal of Stored Products Researchpt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
person.familyNamede Almeida Carvalho
person.familyNameFradinho
person.familyNameMagro
person.familyNameRaymundo
person.familyNameSousa
person.givenNameMaria Otília
person.givenNamePatrícia
person.givenNameAna
person.givenNameAnabela
person.givenNameIsabel
person.identifierM-7348-2016
person.identifier1445512
person.identifier.ciencia-id1115-7CFB-5511
person.identifier.ciencia-idF01A-8E33-1E96
person.identifier.ciencia-idEF1D-3BB0-98B4
person.identifier.ciencia-idD71D-F355-5B85
person.identifier.ciencia-id8113-9DC6-277F
person.identifier.orcid0000-0001-9501-674X
person.identifier.orcid0000-0002-2503-9898
person.identifier.orcid0000-0002-0881-0011
person.identifier.orcid0000-0001-5266-1685
person.identifier.orcid0000-0001-9384-7646
person.identifier.ridN-3459-2013
person.identifier.ridM-9260-2013
person.identifier.scopus-author-id35726802000
person.identifier.scopus-author-id35880719100
person.identifier.scopus-author-id55957162900
person.identifier.scopus-author-id6701317947
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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