Simple Microfluidic Device for Fabrication of Essential Oil Microcapsules via Complex Coacervation
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Abstract
This research aimed to optimize the preparation process and characterize orange essential oil microcapsules synthesized by the complex coacervation method using a simple microfluidic device. The effects on the properties of the synthesized microcapsules of some factors were studied including pH, the mass ratio of gelatin (GE) to carboxymethyl cellulose (CMC) in gelatin-carboxymethyl cellulose (GE-CMC) shell, the mass ratio of GE-CMC shell to essential oil (EO) and the concentration of tannic acid (TA) used as a cross-linking agent for GE-CMC shell. From the synthesis of essential oil microcapsules covered by GE-CMC shell (GE-CMC-EO) and the synthesis of GE-CMC-EO with TA as a cross-linking agent (GE-CMC-EO-TA), it was found that the optimal pH, mass ratio of GE to CMC in GE-CMC shell, mass ratio of GE to CMC to EO in GE-CMC-EO, and TA amount for the synthesis of microcapsules of orange essential oil were 4.0, 1:1, 1:1:1, and 2% w/v, respectively. Functional group analysis of the essential oil microcapsules using Fourier transform infrared spectroscopy revealed that GE-CMC-EO-TA exhibited O-H bond crosslinks between GE-CMC molecules, in addition to the self-linking between GE-CMC molecules found in GE-CMC-EO. Morphological study using Scanning electron microscopy demonstrated that GE-CMC-EO had rough and thin walls while GE-CMC-EO-TA had thicker and stronger walls. Thermal property study using Thermogravimetric analysis indicated that addition of TA enhanced the thermal stability of the microcapsules and resulted in slower release of the essential oil. These properties make the microcapsules suitable for applications in air freshener sachets.
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บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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