Studies on potato sprout suppressants. 3. Effect of storage conditions on tecnazene residue levels in treated tubers

1980 ◽  
Vol 23 (3) ◽  
pp. 335-344 ◽  
Author(s):  
J. Dalziel ◽  
T. C. Aitchison ◽  
H. J. Duncan
Keyword(s):  
Storage Conditions ◽  
Potato Sprout ◽  
Residue Levels ◽  
Sprout Suppressants

scholarly journals Degradation of Parathion Methyl on Field-Sprayed Apples and Stored Apples

1999 ◽  
Vol 82 (2) ◽  
pp. 359-363 ◽  
Author(s):  
Christos J Pappas ◽  
Nikolaos B Kyriakidis ◽  
Panagiotis E Athanasopoulos
Keyword(s):  
Active Ingredient ◽  
Chromatographic Method ◽  
Kinetic Equations ◽  
Storage Conditions ◽  
Controlled Atmosphere ◽  
Ambient Conditions ◽  
Limit Of Determination ◽  
Residue Levels ◽  
Gas Chromatographic Method ◽  
Best Fit

Abstract Residue levels of parathion methyl on field-sprayed Granny-Smith apples were studied. The pesticide was applied according to producer recommendations. Apples received a single spraying at a rate of 40 g active ingredient/100 L. Residues were determined with a simple gas chromatographic method. Recovery of parathion methyl was88-108%, and the limit of determination was 0.002 mg/kg. Decomposition of parathion methyl was studied in apples remaining on trees after spraying and in apples harvested and stored under ambient-temperature, refrigerated- room, and controlled-atmosphere conditions. During post harvest storage, parathion methyl degrades more slowly than on apples remaining on the trees. Best-fit curves were determined, and kinetic equations, rate constants, and half-lives were calculated. Half-lives found were 8 days for apples on trees, 45 days for apples stored at ambient conditions, 68 days for apples stored in control led-atmosphere room, and 62 days for apples stored in a refrigerated room. Under storage conditions, levels of parathion methyl residues need a longtime to become lower than the legal limit (0.2 mg/kg).

scholarly journals The Effect of Essential Oil Formulations for Potato Sprout Suppression

2010 ◽  
Vol 5 (4) ◽  
pp. 1934578X1000500
Author(s):  
Moses S. Owolabi ◽  
Labunmi Lajide ◽  
Matthew O. Oladimeji ◽  
William N. Setzer
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Environmentally Benign ◽  
Plant Materials ◽  
Potato Sprout ◽  
Sprout Suppression ◽  
Essential Oil Formulations ◽  
Triton X ◽  
Sprout Growth ◽  
Sprout Suppressants

The concerns over safety and environmental impact of synthetic pesticides such as chlorpropham (CIPC) has stimulated interest in finding environmentally benign, natural sprout suppressants, including essential oils. The effects of Chenopodium ambrosioides and Lippia multiflora essential oils on sprout growth and decay of stored potatoes has been investigated. Formulations of essential oils with alumina, bentonite, or kaolin, both with and without Triton X-100 additive, were tested. These formulations have been compared to the pulverized plant materials themselves as well as wick-volatilized essential oils. The results showed that the tested oils possess compositions that make them suitable for application as sprout suppressants. Additionally, the formulation seems to be able to reduce the volatility of the essential oil and artificially extend dormancy of stored potatoes.

scholarly journals The Assessment of Laser Photoacoustic Spectroscopy as the Analytical Tool for Studying the Potato Sprout Suppressants Carvone and Pulegone

1990 ◽  
Vol 44 (2) ◽  
pp. 263-265 ◽  
Author(s):  
Dane Bićanić ◽  
Ben Zuidberg ◽  
Henk Jalink ◽  
András Miklós ◽  
Klaasje Hartmans ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Analytical Tool ◽  
Potato Sprout ◽  
Laser Photoacoustic Spectroscopy ◽  
Sprout Suppressants

scholarly journals HPLC-UV Method Development and Validation of Potato Sprout Inhibitor 1,4-Dimethylnaphthalene Using Different Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Nidhal S. Mohammed ◽  
T. H. Flowers ◽  
H. J. Duncan
Keyword(s):  
Environmental Samples ◽  
Method Development ◽  
Limit Of Detection ◽  
Internal Standard ◽  
Reversed Phase ◽  
Potato Sprout ◽  
Method Development And Validation ◽  
Residue Levels ◽  
Development And Validation

1,4-Dimethylnaphthalene (1,4-DMN) is effective sprout suppressant used in potato stores in many countries in the world. High residue levels of this compound on the potatoes and in other environmental samples are considered for human health and environmental risks. Determination of the residue requires specific analytical methods to be developed and validated. In this study, HPLC-UV was selected for validating a separation method based on reversed phase for the analysis of 1,4-DMN using 2-methylnaphthalene (2-MeN) as internal standard testing three HPLC systems. Under the same chromatographic conditions, all three systems achieved good separation on a Jones column (Hypersil ODS 5 μm, 250 mm × 4.6 mm) at ambient temperature isocratically using 70% acetonitrile as mobile phase at a flow rate of 1.5 mL min−1, 20 μL injection volume, a run time of 10 min, and a detection wavelength of 228 nm. All three systems showed high precision, good linearity, and low limit of detection (LOD) and quantification (LOQ); particularly, the SpectraSERIES UV100-autosampler system offered lower values of LOD (0.001–0.004 μg mL−1) and LOQ (0.002–0.013 μg mL−1) for both compounds. This system can be used for the quantitative determination of 1,4-DMN residue in potato and environmental samples.

2,4-D residues in stored lemons from post-harvest treatments

1977 ◽  
Vol 17 (84) ◽  
pp. 167 ◽  
Author(s):  
G Singh ◽  
LE Rippon ◽  
WS Gilbert
Keyword(s):  
Ethyl Ester ◽  
Sodium Salt ◽  
Storage Conditions ◽  
Dichlorophenoxyacetic Acid ◽  
Line Treatment ◽  
Single Treatment ◽  
Post Harvest ◽  
Permissible Limits ◽  
Residue Levels ◽  
2,4 Dichlorophenoxyacetic Acid

Lemons were treated under simulated commercial conditions with various forms of 2,4- dichlorophenoxyacetic acid (2,4-D) to reduce losses in storage from stem end rot caused by the fungus Diaporthe citri. The 2,4-D was applied either as a single packing line treatment in wax, or as a double treatment in a benomyl fungicide bulk dip followed by the packing line treatment. The fruit were held under commercially used storage conditions and analysed at intervals for 2,4-D residues. In one trial, the sodium salt at 100 to 500 mg 2,4-Dl-1 in wax was used, and the wax applied by the foaming and dipping methods, Initial residue levels on the fruit varied with rate of application of the salt, but foaming and dipping modes of application gave similar levels. At eight weeks, residues were only detectable in double treated fruit. In a second trial, the sodium and dimethylamine salts and the ethyl ester forms were used, as a single treatment at 500 mg 2,4-D l-1 in wax foam or a double treatment at 500 mg 2,4-D l-1 in a benomyl dip followed by 500 mg 2,4-D l-1 in wax foam. The residue levels were in the order: sodium salt < dimethylamine salt < ethyl ester. Residues declined in storage, but were still detectable after 12 weeks, except for the single treatment with the sodium salt. Residues from both single and double 2,4-D treatments were always within Australian and U.S permissible limits. Provided that the recommended rate of 500 mg 2.4-D l-1 is not exceeded, none of the 2,4-D formulations tested should give excessive residues in fruit.

Studies on potato sprout suppressants. 5. The effect of chlorpropham contamination on the performance of seed potatoes

1982 ◽  
Vol 25 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Isabella M. G. Boyd ◽  
J. Dalziel ◽  
H. J. Duncan
Keyword(s):  
Seed Potatoes ◽  
Potato Sprout ◽  
Sprout Suppressants
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