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Lactobacillus plantarum과 Bifidobacterium longum을 이용한 대두 이소플라본의 비배당체로의 전환
김인복,신선,임병락,성금수,이영은,Kim, In-Bok,Shin, Sun,Lim, Byung-Lak,Seong, Gem-Soo,Lee, Young-Eun 한국식품조리과학회 2010 한국식품조리과학회지 Vol.30 No.2
In this study, phytoestrogen for the industrial production of soybean probiotics by lactic acid bacteria (LAB) was studied in a soybean extract. Soybean was fermented with LAB, Lactobacillus plantarum KCTC 3108 and Bifidobacterum longum ATCC 15707. The change in the content of various isoflavones (aglycone and glucoside) and the $\beta$-glucosidase activity in soybean during fermentation were investigated and shown to be dependent on the starter organism. Soybean extract powder fermented with L. plantarum showed the highest $\beta$-glucosidase activity and the greatest increase in the aglycone content. After 48h of fermentation, the contents of daidzin, genistin and glycitin in L. plantarum decreased from a mean initial levels of $83.03{\pm}2.17$, $168.13{\pm}8.17$ and $20.02{\pm}1.07$, respectively, to mean levels of $5.34{\pm}3.24$, $3.79{\pm}0.57$ and $1.87{\pm}1.09\;mg$/100 g. Whereas, after 48h fermentation, the contents of daidzein, genistein and glycitein increased from a mean initial levels of $8.09{\pm}0.78$, $11.20{\pm}0.84$ and $4.71{\pm}0.46$, respectively, to mean levels of $85.76{\pm}0.84$, $175.87{\pm}2.21$ and $22.41{\pm}0.91\;mg$/100 g. Taken together, these results suggested an increase of aglycones and decrease of glucoside in isoflavones occurred during fermentation, which coincided with an increase of $\beta$-glucosidase activity in the fermented soybean extract powder.
A Thiophene Based Dopant-Free Hole-Transport Polymer for Efficient and Stable Perovskite Solar Cells
김인복,김연주,김동유,장수영 한국고분자학회 2022 Macromolecular Research Vol.30 No.6
Polymer hole-transport layer (HTL) materials have gained considerable attention because of their solution processability, which is effective for maintaining mechanical flexibility for printing technology in perovskite solar cells (PSCs). However, these materials have low carrier mobility that is insufficient to transport charge carriers. The doping process is usually employed to overcome this drawback, but it adversely affects the device stability. In this study, a dopant-free P18, which is composed of rigid and coplanar thienylenevinylene and dithienothiophene, is used as a HTL in PSCs. These units consist of thiophene which can coordinate with Pb2+ atoms as Lewis bases in order to suppress charge recombination on the perovskite surface and grain boundary. The PSCs fabricated with the dopant-free P18 present a power conversion efficiency of 14.8%, which is higher than that with doped P3HT (13.9%). Furthermore, the PSC fabricated with the dopant-free P18 can maintain a performance of 60% under the humidity conditions of 70-80% after 200 hours without encapsulation by limiting the hygroscopic dopant in the HTL, which is superior to those fabricated with doped P3HT (25%). The results of this study demonstrate that the high-mobility thiophene-based conjugated polymers can act as highly efficient and stable dopant-free HTL materials in PSCs.