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Microfluidic Fabrication of Microcapsules in 3D PDMS Microfluidic Device for Cosmetic Applications
류상아,오희묵,이준배,이효민 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Glass capillary device has been widely used in droplet microfluidics due to ease of assembly, organic solvent resistance, and 3D tapered geometry. However, production of monodisperse sub-50 μm double emulsions in these devices is challenging. In this work, we utilize 3D poly(dimethyl siloxane)(PDMS) device to produce monodisperse double emulsion droplets for cosmetic applications. We show that our device with spatial pattern in surface wettability allows robust production of double emulsion templated microcapsules for encapsulation and retention of TECA, a cosmetic ingredient with antioxidant activity. We further confirm the validity of this approach by demonstrating that monodisperse polymersomes with size below 50 μm can be produced for effective skin delivery.
강은영,정일용,한상아,김선미,장미정,류채연,박소연,김지현,김유정,김성원 한국유방암학회 2011 Journal of breast cancer Vol.14 No.2
Purpose: Primary systemic therapy (PST) downstages up to 40% of initial documented axillary lymph node (ALN) metastases in breast cancer. The current surgical treatment after PST consists of breast tumor resection and axillary lymph node dissection (ALND). This strategy, however, does not eliminate unnecessary ALND in patients with complete remission of axillary metastases. The aim of this study was to examine the accuracy of sentinel lymph node biopsy (SLNB) after PST among patients with documented ALN metastasis at presentation and to identify the rate of pathologic complete-remission (CR) with ALN after PST. Methods: We analyzed 66 patients with ALN metastasis that was pathol- ogically proven preoperatively who underwent SLNB and concomitant ALND after PST. Axillary ultrasound (AUS) was used to evaluate the clinical response of initially documented ALN metastasis after PST. Intraoperative lymphatic mapping was performed using blue dye with or without radioisotope. Results: After PST, 34.8% of patients had clinical CR of ALN on AUS and 28.8% patients had pathologic CR of ALN. The overall success rate of SLNB after PST was 87.9%, and the sentinel lymph node identification rate in patients with clinical CR was 95.7%. In patients with successful lymphatic mapping, 70.7% of patients had residual axillary metastases. The overall accuracy and false-negative rate were 87.9% and 17.1% in all patients: 95.5% and 10.0% in patients with clinical CR of ALN, and 83.3% and 19.4% in patients with residual axillary disease after PST. Conclusion: Our findings suggest that SLNB may be feasible in patients with initial documented ALN metastasis who have clinical CR for metastatic ALN after PST. Further investigation in a prospective setting should be performed to confirm our results.