Controlled release behavior of sulfentrazone herbicide encapsulated in Ca-ALG microparticles: preparation, characterization, mathematical modeling and release tests in field trial weed control

2017 ◽  
Vol 52 (16) ◽  
pp. 9491-9507 ◽  
Author(s):  
S. M. Dourado Junior ◽  
E. S. Nunes ◽  
R. P. Marques ◽  
L. S. Rossino ◽  
F. J. Quites ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Controlled Release ◽  
Weed Control ◽  
Field Trial ◽  
Release Behavior

Simulated controlled-release mesotrione for turfgrass tolerance and weed control

2021 ◽  
pp. 1-25
Author(s):  
Matthew J. R. Goddard ◽  
Clebson G. Gonçalves ◽  
Shawn D. Askew
Keyword(s):  
Controlled Release ◽  
Weed Control ◽  
White Clover ◽  
Tall Fescue ◽  
Standard Treatment ◽  
Creeping Bentgrass ◽  
Control Efficacy ◽  
Stepwise Change

Abstract Mesotrione typically requires multiple applications to control emerged weeds in turfgrass. Since it is absorbed by both foliage and roots, a controlled-release (CR) formulation could eliminate the need for multiple applications. Research was conducted evaluate simulated-release scenarios that mimic a potential CR mesotrione formulation. A soluble concentrate formulation of mesotrione was titrated to produce a stepwise change in mesotrione rates, which were applied daily to mimic predetermined release scenarios over a three-wk period. CR scenarios were compared to a broadcast treatment of mesotrione at 280 g ai ha-1 applied twice at three-wk intervals, and a nontreated. Mesotrione applied in three temporal release scenarios controlled creeping bentgrass, goosegrass, nimblewill, smooth crabgrass, and white clover equivalent to the standard sprayed mesotrione treatment in every comparison. However, each CR scenario injured tall fescue 2 to 7 times more than the standard treatment. Soil- and foliar-initiated repeat treatments were equivalent in most comparisons. Data indicates that mesotrione applied in a temporal range to simulate controlled release scenarios can deliver desired weed control efficacy comparable to sequential broadcast applications. More research is needed to elucidate proper timings and release scenarios to minimize turfgrass injury.

Pectin-Chitosan Multilayer Coated Microbeads of Diclofenac Sodium Prepared by Layer-by-Layer Technique

2014 ◽  
Vol 1060 ◽  
pp. 45-49
Author(s):  
Kamonrak Cheewatanakornkool ◽  
Pornsak Sriamornsak
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Diclofenac Sodium ◽  
Gastric Fluid ◽  
Layer By Layer ◽  
Release Behavior ◽  
Freeze Dried ◽  
Layer Technique ◽  
Calcium Pectinate ◽  
Layer By Layer Technique

The main objective of this study was to fabricate biopolymer-based microbeads, providing enteric properties and controlled release of diclofenac sodium, using layer-by-layer technique. The calcium pectinate microbeads have been designed and coated with chitosan and pectin multilayers. Drug release was performed in simulate gastric fluid (pH 1.2) for 2 hours, followed by pH 6.8 buffer for 8 hours. The effects of chitosan concentration, number of layer and drying technique on drug release were investigated. The results showed that the calcium pectinate microbeads could be simply prepared by ionotropic gelation and then coated with chitosan and pectin solutions using layer-by-layer procedure. The diameter of the microbeads ranged from 800 to 1000 μm for air-dried samples and from 1 to 2 mm for freeze-dried samples. The freeze-dried microbeads had a rough surface and many pores inside, as observed by SEM. The microbeads coated with 4% chitosan/4% pectin revealed a slower drug release than those coated with 1% chitosan/4% pectin and demonstrated a controlled release pattern. Moreover, different drying techniques and numbers of layer also influenced drug release behavior of the prepared microbeads.

Mathematical Modeling of Controlled-Release Kinetics of Herbicides in a Dynamic-Water-Bath System

2001 ◽  
pp. 563-574
Author(s):  
Félix M. Pereira ◽  
Adilson R. Gonçalves ◽  
André Ferraz ◽  
Flávio T. Silva ◽  
Samuel C. Oliveira
Keyword(s):  
Mathematical Modeling ◽  
Controlled Release ◽  
Release Kinetics ◽  
Water Bath ◽  
Kinetics Of

Tuning Controlled Release Behavior of Starch Granules Using Nanofibrillated Cellulose Derived from Waste Sugarcane Bagasse

2018 ◽  
Vol 6 (7) ◽  
pp. 9208-9217 ◽  
Author(s):  
Mayur D. Patil ◽  
Vishal D. Patil ◽  
Aditya A. Sapre ◽  
Tushar S. Ambone ◽  
Arun Torris A. T. ◽  
...  
Keyword(s):  
Controlled Release ◽  
Sugarcane Bagasse ◽  
Nanofibrillated Cellulose ◽  
Starch Granules ◽  
Release Behavior

Eccentric magnetic microcapsules for orientation-specific and dual stimuli-responsive drug release

2015 ◽  
Vol 3 (22) ◽  
pp. 4530-4538 ◽  
Author(s):  
Jingxian Huang ◽  
Chongdai Luo ◽  
Wanbo Li ◽  
Yan Li ◽  
Yu Shrike Zhang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Drug Release ◽  
Release Behavior ◽  
Stimuli Responsive

Uniform eccentric magnetic microcapsules show controlled-release behavior for orientation-specific and dual stimuli-responsive drug delivery under ultrasound and laser regulation.

Degradation and Controlled Release Behavior of ε-Caprolactone Copolymers in Biodegradable Antifouling Coatings

2006 ◽  
Vol 7 (3) ◽  
pp. 851-857 ◽  
Author(s):  
Fabienne Faÿ ◽  
Isabelle Linossier ◽  
Valérie Langlois ◽  
Estelle Renard ◽  
Karine Vallée-Réhel
Keyword(s):  
Controlled Release ◽  
Release Behavior ◽  
Antifouling Coatings

Movement of Alachlor and Metribuzin from Controlled Release Formulations in a Sandy Soil

Weed Science ◽  
1992 ◽  
Vol 40 (4) ◽  
pp. 606-613 ◽  
Author(s):  
Gwen F. Fleming ◽  
Loyd M. Wax ◽  
F. William Simmons ◽  
Allan S. Felsot
Keyword(s):  
Controlled Release ◽  
Weed Control ◽  
Soil Depth ◽  
Soil Surface ◽  
Column Experiments ◽  
Limited Effect ◽  
Emulsifiable Concentrate ◽  
Growing Seasons ◽  
Primary Mechanism ◽  
Controlled Release Formulations

Field and column experiments were conducted to determine the effect of controlled release formulations on weed control and leaching of alachlor and metribuzin on a Plainfield sand. Controlled release formulations including two starch encapsulations of both herbicides and a microencapsulation of alachlor were compared to emulsifiable concentrate and dry flowable formulations of alachlor and metribuzin, respectively. Herbicide movement was measured in laboratory columns and in the field throughout two growing seasons to a soil depth of 91 cm. Soybean injury and weed control were monitored. No significant differences in herbicide movement between starch-encapsulated and emulsifiable concentrate formulations were observed in either field or column experiments. Microencapsulation resulted in the greatest retention of alachlor in the soil surface in field and columns. Compared to the dry flowable formulation, starch encapsulation did not affect metribuzin distribution in the field but reduced leaching in columns. Controlled release formulations did not result in significant differences in weed control and soybean injury compared to the emulsifiable concentrate alachlor and dry flowable metribuzin formulations. Starch encapsulations had a limited effect on alachlor and metribuzin movement. Degradation appeared to be the primary mechanism for herbicide dissipation while leaching losses were minor.

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