Pub Date : 2017-01-01DOI: 10.1504/IJPTI.2017.092450
R. A. Atuna, E. Carey, F. Amagloh
Three sweetpotato cultivars; OFSP-1, OFSP-2 and WFSP were investigated for storability using two storage methods (heap vs. sand box), following curing (dehaulming, field-piled or no curing). Storage roots (SRs) were subsequently stored using either heap or sand box methods. SRs were deliberately injured and wound healing assessed over a 6-day period. Over an 11 week storage period, OFSP-2 recorded the highest weight loss (9.7%; p = 0.04), weevil damage (3.7%; p = 0.49) and rot (21%; p < 0.001). Weight loss and weevil damage were respectively 1.8-times and 23-times higher in the SRs stored in heap method compared with those in the sand box method. Except for WFSP, the wound healing score increased gradually to the 3rd or 4th day for OFSP-2 and OFSP-1 respectively before levelling off. The sand box method performed better than heap storage should be encouraged for the storage of sweetpotato SRs at the household-level.
{"title":"Shelf life extension of sweetpotato (Ipomoea batatas (L) Lam) storage roots using household-level storage methods","authors":"R. A. Atuna, E. Carey, F. Amagloh","doi":"10.1504/IJPTI.2017.092450","DOIUrl":"https://doi.org/10.1504/IJPTI.2017.092450","url":null,"abstract":"Three sweetpotato cultivars; OFSP-1, OFSP-2 and WFSP were investigated for storability using two storage methods (heap vs. sand box), following curing (dehaulming, field-piled or no curing). Storage roots (SRs) were subsequently stored using either heap or sand box methods. SRs were deliberately injured and wound healing assessed over a 6-day period. Over an 11 week storage period, OFSP-2 recorded the highest weight loss (9.7%; p = 0.04), weevil damage (3.7%; p = 0.49) and rot (21%; p < 0.001). Weight loss and weevil damage were respectively 1.8-times and 23-times higher in the SRs stored in heap method compared with those in the sand box method. Except for WFSP, the wound healing score increased gradually to the 3rd or 4th day for OFSP-2 and OFSP-1 respectively before levelling off. The sand box method performed better than heap storage should be encouraged for the storage of sweetpotato SRs at the household-level.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"5 1","pages":"274"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJPTI.2017.092450","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-23DOI: 10.1504/ijpti.2015.074322
A. Rady, S. Soliman
Instrumented sphere (IS) was utilised to evaluate several surfaces used in harvesting and handling potatoes (Lady Rosetta cultivar) by dropping the IS from 5 to 90 cm. The minimum dropping heights causing unallowable damage were 15, 15, and 25 cm on steel sheet, steel rods, and rubber-coated steel rods, respectively. However, the two-layer potato surface caused no unallowable damage in the drop height range of 5-90 cm. Tubers were dropped on the above surfaces and respiration (RR), bruise volume (Vb), and split area (As) were measured to assess the physiological behaviour after the drop test. The absorbed energy (Eab) was calculated for each dropped tuber and the results showed that steel sheet and steel rods resulted in higher RR and Vb values compared to the coated steel rods and potato surfaces. Regression equation of Eab with RR yielded fair performance for steel sheet and potato surfaces with an R2 value of 0.78 and 0.56, respectively. Regression of Eabwith Vb resulted in an R2 higher than 0.98.
{"title":"Evaluation of mechanical damage of Lady Rosetta potato tubers using different methods","authors":"A. Rady, S. Soliman","doi":"10.1504/ijpti.2015.074322","DOIUrl":"https://doi.org/10.1504/ijpti.2015.074322","url":null,"abstract":"Instrumented sphere (IS) was utilised to evaluate several surfaces used in harvesting and handling potatoes (Lady Rosetta cultivar) by dropping the IS from 5 to 90 cm. The minimum dropping heights causing unallowable damage were 15, 15, and 25 cm on steel sheet, steel rods, and rubber-coated steel rods, respectively. However, the two-layer potato surface caused no unallowable damage in the drop height range of 5-90 cm. Tubers were dropped on the above surfaces and respiration (RR), bruise volume (Vb), and split area (As) were measured to assess the physiological behaviour after the drop test. The absorbed energy (Eab) was calculated for each dropped tuber and the results showed that steel sheet and steel rods resulted in higher RR and Vb values compared to the coated steel rods and potato surfaces. Regression equation of Eab with RR yielded fair performance for steel sheet and potato surfaces with an R2 value of 0.78 and 0.56, respectively. Regression of Eabwith Vb resulted in an R2 higher than 0.98.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijpti.2015.074322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-23DOI: 10.1504/ijpti.2015.074320
C. Bertrand, M. Raposo, R. Morais, A. M. Morais
Fresh-cut fruits are highly susceptible to enzymatic browning. The aim of this study was to evaluate the effects of the exopolysaccharide (EPS) from the marine microalga Porphyridium cruentum on polyphenol oxidase (PPO) activity and colour of 'Cavendish' banana slices during storage at 4°C. The banana slices became browner (L* values and/or chroma values decreased, and/or a* increased), while PPO activity of coated samples remained approximately constant throughout storage. EPS 5 g.L−1 solution could be used as a coating to prevent the browning of 'Cavendish' banana slices, although after six days of storage the results obtained on colour and PPO activity were very similar to those of carrageenan.
{"title":"Effects of the exopolysaccharide from Porphyridium cruentum coating on polyphenol oxidase activity and colour of fresh-cut banana during cold storage","authors":"C. Bertrand, M. Raposo, R. Morais, A. M. Morais","doi":"10.1504/ijpti.2015.074320","DOIUrl":"https://doi.org/10.1504/ijpti.2015.074320","url":null,"abstract":"Fresh-cut fruits are highly susceptible to enzymatic browning. The aim of this study was to evaluate the effects of the exopolysaccharide (EPS) from the marine microalga Porphyridium cruentum on polyphenol oxidase (PPO) activity and colour of 'Cavendish' banana slices during storage at 4°C. The banana slices became browner (L* values and/or chroma values decreased, and/or a* increased), while PPO activity of coated samples remained approximately constant throughout storage. EPS 5 g.L−1 solution could be used as a coating to prevent the browning of 'Cavendish' banana slices, although after six days of storage the results obtained on colour and PPO activity were very similar to those of carrageenan.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijpti.2015.074320","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66690004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-23DOI: 10.1504/ijpti.2015.074321
Md. Ashrafuzzaman Gulandaz, M. Ali, M. M. Hasan, M. Nur-A-Alam, N. Jahan, Md Mashiur Rahman
A modified hybrid solar dryer having capacity of 500 kg was constructed to carry out the study. Performance of the dryer was evaluated based on the drying rate, collector performance, collector efficiency, drying efficiency and quality of paddy (Oryza Sativa L.) seed. A 0.50 kW, 220 V centrifugal variac connected blower was used to control air flow. The drying air was heated up in the solar collector and passed to the drying chamber. Seeds were collected having initial moisture content of 23.86% (wb). Tetrazolium and standard germination tests were used to evaluate seed. This study found maximum germination (86%) percentage at 44°C and viability at that temperature was 97.5%. The germination percentage decreases with increasing drying temperature and 44°C temperature is completely safe for paddy seeds. This study also observed that amongst nine models Page model is best fitted model based on highest R2 and lowest RMSE values.
{"title":"Performance evaluation of modified hybrid solar dryer for paddy seed","authors":"Md. Ashrafuzzaman Gulandaz, M. Ali, M. M. Hasan, M. Nur-A-Alam, N. Jahan, Md Mashiur Rahman","doi":"10.1504/ijpti.2015.074321","DOIUrl":"https://doi.org/10.1504/ijpti.2015.074321","url":null,"abstract":"A modified hybrid solar dryer having capacity of 500 kg was constructed to carry out the study. Performance of the dryer was evaluated based on the drying rate, collector performance, collector efficiency, drying efficiency and quality of paddy (Oryza Sativa L.) seed. A 0.50 kW, 220 V centrifugal variac connected blower was used to control air flow. The drying air was heated up in the solar collector and passed to the drying chamber. Seeds were collected having initial moisture content of 23.86% (wb). Tetrazolium and standard germination tests were used to evaluate seed. This study found maximum germination (86%) percentage at 44°C and viability at that temperature was 97.5%. The germination percentage decreases with increasing drying temperature and 44°C temperature is completely safe for paddy seeds. This study also observed that amongst nine models Page model is best fitted model based on highest R2 and lowest RMSE values.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijpti.2015.074321","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-23DOI: 10.1504/IJPTI.2015.074334
K. Rekoumi, I. Karapanos, H. Passam
Weight loss of pods of small-fruiting okra cv. Boyiatiou stored at 10°C was higher than that of large-fruiting cv. Clemson spineless. Enclosure in plastic film reduced weight loss, but in Clemson spineless caused surface discoloration. In both cultivars, respiration and ethylene evolution increased during storage, while firmness and colour intensity decreased. Subsequent transfer of pods to room temperature (22°C) for three days increased loss of weight, firmness and colour, especially if the film was removed. We conclude that the small pods of cv. Boyiatiou may only be stored satisfactorily at 10°C if enclosed in plastic film, and for a period of > 5 days pods should not be subsequently subjected to shelf life at 22°C. The larger pods of Clemson spineless, however, store better in air at 10°C. Thus, recommendations for storage should take into account cultivar and pod size.
{"title":"Comparative storage behaviour of the pods from a large-fruiting and small-fruiting okra cultivar","authors":"K. Rekoumi, I. Karapanos, H. Passam","doi":"10.1504/IJPTI.2015.074334","DOIUrl":"https://doi.org/10.1504/IJPTI.2015.074334","url":null,"abstract":"Weight loss of pods of small-fruiting okra cv. Boyiatiou stored at 10°C was higher than that of large-fruiting cv. Clemson spineless. Enclosure in plastic film reduced weight loss, but in Clemson spineless caused surface discoloration. In both cultivars, respiration and ethylene evolution increased during storage, while firmness and colour intensity decreased. Subsequent transfer of pods to room temperature (22°C) for three days increased loss of weight, firmness and colour, especially if the film was removed. We conclude that the small pods of cv. Boyiatiou may only be stored satisfactorily at 10°C if enclosed in plastic film, and for a period of > 5 days pods should not be subsequently subjected to shelf life at 22°C. The larger pods of Clemson spineless, however, store better in air at 10°C. Thus, recommendations for storage should take into account cultivar and pod size.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJPTI.2015.074334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-23DOI: 10.1504/ijpti.2015.074313
C. Bertrand, M. Raposo, R. Morais, A. M. Morais
Fresh-cut fruits are highly susceptible to enzymatic browning. The aim of this study was to evaluate the effects of different coatings on polyphenol oxidase (PPO) activity and colour of 'Royal Gala' apple cubes during storage at 4°C. The main constituents (polysaccharides) of the coatings used were carrageenan, alginate, the exopolysaccharide (EPS) from the marine microalga Porphyridium cruentum, pectin, and carboxymethyl cellulose (CMC). When PPO activity increased, the apple cubes became browner (L* values decreased, and/or a* and/or b* values increased) for pectin, carrageenan, EPS 5 g.L−1 and CMC coatings. EPS coated apple cubes, in particular, did not present the best results in order to prevent the colour changes and to lower down PPO activity, but the results obtained were very similar to those of alginate. The coating based on pectin was the most recommended to preserve fresh-cut 'Royal Gala' apple closely followed by CMC.
{"title":"Effects of different edible coatings on polyphenol oxidase activity and colour of fresh-cut apple during cold storage","authors":"C. Bertrand, M. Raposo, R. Morais, A. M. Morais","doi":"10.1504/ijpti.2015.074313","DOIUrl":"https://doi.org/10.1504/ijpti.2015.074313","url":null,"abstract":"Fresh-cut fruits are highly susceptible to enzymatic browning. The aim of this study was to evaluate the effects of different coatings on polyphenol oxidase (PPO) activity and colour of 'Royal Gala' apple cubes during storage at 4°C. The main constituents (polysaccharides) of the coatings used were carrageenan, alginate, the exopolysaccharide (EPS) from the marine microalga Porphyridium cruentum, pectin, and carboxymethyl cellulose (CMC). When PPO activity increased, the apple cubes became browner (L* values decreased, and/or a* and/or b* values increased) for pectin, carrageenan, EPS 5 g.L−1 and CMC coatings. EPS coated apple cubes, in particular, did not present the best results in order to prevent the colour changes and to lower down PPO activity, but the results obtained were very similar to those of alginate. The coating based on pectin was the most recommended to preserve fresh-cut 'Royal Gala' apple closely followed by CMC.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijpti.2015.074313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-01DOI: 10.1504/IJPTI.2016.10004629
B. A. Alimi, T. Shittu
Activity of polyphenol oxidase (PPO) from the pulp of three banana cultivars grown in Nigeria, namely: plantain, light green-skinned banana and red-skinned banana at unripe and ripe states were investigated. The efficiency of extraction of crude PPO enzyme and in-vitro assay of its activity were determined. Polyethylene glycol detergent gave the highest extraction efficiency. Enzyme activity and rate of browning were found to be highest in plantain and least in light green-skinned banana. Enzymes from all the cultivars were specific towards O-diphenolic compounds and not to monophenolics. The optima pH of PPO of the cultivars tends towards neutrality (6.6-7.0). Enzyme activity was destroyed between 2 and 4 min at 80°C. Thermal inactivation kinetic parameters revealed plantain's PPO to be the most thermal stable. Sodium metabisulphite was the most effective chemical inhibitor of the PPO. The electrophoretic patterns of banana PPO showed heterogeneity with greater number of bands in ripe.
{"title":"In-vitro assay and inactivation kinetics of polyphenol oxidase of some Nigerian banana and plantain cultivars","authors":"B. A. Alimi, T. Shittu","doi":"10.1504/IJPTI.2016.10004629","DOIUrl":"https://doi.org/10.1504/IJPTI.2016.10004629","url":null,"abstract":"Activity of polyphenol oxidase (PPO) from the pulp of three banana cultivars grown in Nigeria, namely: plantain, light green-skinned banana and red-skinned banana at unripe and ripe states were investigated. The efficiency of extraction of crude PPO enzyme and in-vitro assay of its activity were determined. Polyethylene glycol detergent gave the highest extraction efficiency. Enzyme activity and rate of browning were found to be highest in plantain and least in light green-skinned banana. Enzymes from all the cultivars were specific towards O-diphenolic compounds and not to monophenolics. The optima pH of PPO of the cultivars tends towards neutrality (6.6-7.0). Enzyme activity was destroyed between 2 and 4 min at 80°C. Thermal inactivation kinetic parameters revealed plantain's PPO to be the most thermal stable. Sodium metabisulphite was the most effective chemical inhibitor of the PPO. The electrophoretic patterns of banana PPO showed heterogeneity with greater number of bands in ripe.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"102 1","pages":"200"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-01DOI: 10.1504/IJPTI.2016.10004627
R. R. Dinrifo
Moisture adsorption isotherms of dried fillets of African catfish (Clarias gariepenus) were determined at 23, 30 and 45°C in the range 0.11 to 0.93 of water activity, using the standard gravimetric static method. The data obtained from the experiments were fitted to four popular mathematical models [the Brunauer, Emmett and Teller (BET), Oswin, Henderson and the modified Guggenheim-Anderson-De Boer (GAB)] and to a set of artificial neural network (ANN) models. The modified GAB outperformed the other mathematical models [with coefficient of determination R2 = 0.96, mean relative error (MRE) = 6.64%] but the ANNs were more accurate (with the best giving R2 = 0.988 and MRE = 3.56%) in predicting the moisture adsorption isotherms of the dried catfish. The knowledge of the adsorption isotherms would be very useful in the design of packages, prediction of storage stability and for calculating moisture changes that may occur during storage.
{"title":"Mathematical and neural network modelling of the adsorption characteristics of dried African catfish (clarias gariepenus)","authors":"R. R. Dinrifo","doi":"10.1504/IJPTI.2016.10004627","DOIUrl":"https://doi.org/10.1504/IJPTI.2016.10004627","url":null,"abstract":"Moisture adsorption isotherms of dried fillets of African catfish (Clarias gariepenus) were determined at 23, 30 and 45°C in the range 0.11 to 0.93 of water activity, using the standard gravimetric static method. The data obtained from the experiments were fitted to four popular mathematical models [the Brunauer, Emmett and Teller (BET), Oswin, Henderson and the modified Guggenheim-Anderson-De Boer (GAB)] and to a set of artificial neural network (ANN) models. The modified GAB outperformed the other mathematical models [with coefficient of determination R2 = 0.96, mean relative error (MRE) = 6.64%] but the ANNs were more accurate (with the best giving R2 = 0.988 and MRE = 3.56%) in predicting the moisture adsorption isotherms of the dried catfish. The knowledge of the adsorption isotherms would be very useful in the design of packages, prediction of storage stability and for calculating moisture changes that may occur during storage.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"5 1","pages":"187"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-01DOI: 10.1504/IJPTI.2016.10004649
M. Ngadi, Arturo J. Martínez, T. Schwinghamer
The objective of this work was to develop a non-subjective freshness index (If) for a Mediterranean variety of eggplant (Solanum melongena L. cv. Traviata). Eggplants were obtained from local agricultural sources and stored under controlled environment conditions. Storage temperature was und to have an effect on If, while the agricultural source and the degree of exposure to light did not affect If. Nonlinear functions modelled If against weight loss (WL), peel gloss loss (GL), surface stiffness loss (SL), density ratio minus one (DRMO), and storage period (in h). The best model for predicting If of eggplant was a function of SL (R2adj =0.98). Stepwise regression identified hyperspectral wavelengths that will predict If at 10°C (R2adj =0.46) and 27°C (R2adj =0.78). If can be used to estimate eggplant quality, therefore future work will develop freshness indices for other eggplant varieties stored under a range of temperature conditions.
{"title":"Development of an objective freshness index for a variety of Mediterranean eggplant","authors":"M. Ngadi, Arturo J. Martínez, T. Schwinghamer","doi":"10.1504/IJPTI.2016.10004649","DOIUrl":"https://doi.org/10.1504/IJPTI.2016.10004649","url":null,"abstract":"The objective of this work was to develop a non-subjective freshness index (If) for a Mediterranean variety of eggplant (Solanum melongena L. cv. Traviata). Eggplants were obtained from local agricultural sources and stored under controlled environment conditions. Storage temperature was und to have an effect on If, while the agricultural source and the degree of exposure to light did not affect If. Nonlinear functions modelled If against weight loss (WL), peel gloss loss (GL), surface stiffness loss (SL), density ratio minus one (DRMO), and storage period (in h). The best model for predicting If of eggplant was a function of SL (R2adj =0.98). Stepwise regression identified hyperspectral wavelengths that will predict If at 10°C (R2adj =0.46) and 27°C (R2adj =0.78). If can be used to estimate eggplant quality, therefore future work will develop freshness indices for other eggplant varieties stored under a range of temperature conditions.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"5 1","pages":"231"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-01-01DOI: 10.1504/IJPTI.2016.10004634
Francis Manjengwa, P. J. Mukaro, T. Nhiwatiwa
A study to determine contamination of fish from Lake Chivero was carried out at selected sites along the fish handling and distribution chain. Samples were collected from lake and vending sites in Harare's high density suburbs, in March, August and November 2012. Pathogenic bacteria indicators were used to investigate the quality of water, fish, and fish contact surfaces to determine the levels of contamination. Swabs on contact surfaces and fish samples were tested for total viable bacterial count, coliforms and Salmonella. The highest coliforms load was recorded in fish trading locations and the lowest in the cold chain samples (Table 1). Salmonella sp. was present in most samples except harvest waters (Table 1). Pathogenic indicator micro-organisms were present in lake water samples (Table 1), suggesting that fish may already be contaminated. The increase in microbial load along the fish handling chain showed poor fish handling was causing additional contamination, presenting a health risk to consumers.
{"title":"An investigation of the microbiological chain of contamination and health implications of fish products from Lake Chivero, Harare, Zimbabwe","authors":"Francis Manjengwa, P. J. Mukaro, T. Nhiwatiwa","doi":"10.1504/IJPTI.2016.10004634","DOIUrl":"https://doi.org/10.1504/IJPTI.2016.10004634","url":null,"abstract":"A study to determine contamination of fish from Lake Chivero was carried out at selected sites along the fish handling and distribution chain. Samples were collected from lake and vending sites in Harare's high density suburbs, in March, August and November 2012. Pathogenic bacteria indicators were used to investigate the quality of water, fish, and fish contact surfaces to determine the levels of contamination. Swabs on contact surfaces and fish samples were tested for total viable bacterial count, coliforms and Salmonella. The highest coliforms load was recorded in fish trading locations and the lowest in the cold chain samples (Table 1). Salmonella sp. was present in most samples except harvest waters (Table 1). Pathogenic indicator micro-organisms were present in lake water samples (Table 1), suggesting that fish may already be contaminated. The increase in microbial load along the fish handling chain showed poor fish handling was causing additional contamination, presenting a health risk to consumers.","PeriodicalId":14399,"journal":{"name":"International Journal of Postharvest Technology and Innovation","volume":"8 1","pages":"215"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66689727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：