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- W2393508268 abstract "Microcapsules with dodecanol(C_ 12OH)encapsulated were prepared through complex coacervation by adding gelatin(GE)solution to an acacia gum(AG)solution and through GE simple coacervation by adding sodium sulfate solution to GE solution,both in presence of C_ 12OH.C_ 12OH was chosen for the core material because it does constitute a real component in sex pheromones of numerous insects.In a first step,Zeta potential and light transmittance in the two coacervation processes were followed in order to determine the optimum ratio of AG and GE in complex coacervation and the best amount of sodium sulfate in simple coacervation.It was observed that maximum yield was achieved for complex coacervation with AG/GE weight ratio at unity,and for simple coacervation when 30 mL of 20% sodium sulfate was added to 40 mL of 6% GE solution.When the wall material concentration was equal to or higher than 3%,the size of the microcapsules from complex coacervation was larger than that prepared through simple coacervation.Nevertheless,simple coacervation led to capsules with much narrower size distribution.C_ 12OH encapsulation rates in simple coacervation were significantly lower compared with those in complex coacervation at equal wall material concentration,leading therefore to a lower C_ 12OH loading in simple coacervation.To investigate C_ 12OH release from the capsules,samples were placed into an incubator with constant temperature(30℃)and relative humidity(50% RH),and taken out for C_ 12OH examination by gas chromatography and by weighing the samples.It was found that all samples from simple coacervation reached their final release in less than one week,no difference was observed for samples prepared with different wall material concentration;whereas microcapsules from complex coacervation manifested a three-step-release profile,i.e.a quick start followed by a constant plateau region and terminated by a release increase till completion.Results also revealed that capsules prepared with higher wall material concentration had a higher release rates.The capsules prepared with 5% solutions of AG and GE lost their C_ 12OH within 2 weeks;lowering wall material concentration effectively reduced C_ 12OH release rate and extended C_ 12OH constant release period.This work indicates that release of C_ 12OH can be well controlled through capsule structure designing.This is of great importance for our on-going study on controlled release of authentic insect semiochemicals." @default.
- W2393508268 created "2016-06-24" @default.
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- W2393508268 date "2007-01-01" @default.
- W2393508268 modified "2023-09-25" @default.
- W2393508268 title "PREPARATION OF INSECT SEX PHEROMONE DODECANOL CONTAINING MICROCAPSULES BY SIMPLE AND COMPLEX COACERVATIONS AND THEIR RELEASE BEHAVIOR" @default.
- W2393508268 hasPublicationYear "2007" @default.
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