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IUPAC-PSK40: N-Channel Organic Field-Effect Transistors and Structure-Property Relationship
Min Jae Sung,Alessandro Luzio,Won-Tae Park,Ran Kim,Eliot Gann,Francesco Maddalena,Giuseppina Pace,Yong Xu,Dario Natali,Carlo de Falco,Long Dang,Christopher R. McNeill,Mario Caironi,Yong-Young Noh,Yun- 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2
Kim, Yang,Williams, Martin A.K.,Luzio, Gary A.,Cameron, Randall G. Elsevier 2017 Food hydrocolloids Vol.69 No.-
<P><B>Abstract</B></P> <P>One of the four pectin methylesterase types isolated from <I>Citrus sinensis</I> var. Valencia fruit was used to demethylesterify a model homogalacturonan (HG) to 30%, 50% and 70% degree of methylesterification (DM) at pH 4.5 and 7.0, respectively. Introduced demethylesterified blocks (DMBs) were released by a <I>limited</I> endo-polygalacturonase (EPG) digestion, separated and quantified by HPAEC. Average DMB size ( B S ¯ ) and number of such blocks per molecule ( B N ¯ ) differed depending on final DM and reaction pH (<I>P</I> < 0.05). B S ¯ and B N ¯ were significantly higher in 30% DM HG than 50 and 70 DMs. pH 4.5 series showed significantly larger B S ¯ compared to pH 7.5 series (<I>P</I> < 0.01). Distribution of DMBs released by <I>limited</I> EPG digest was predicted by mathematical modeling and <I>in silico</I> modeled processive (degree of processivity = 10), multiple attack mode of action best explains the experimental block distributions. Absolute degree of blockiness (DB<SUB>abs</SUB>) obtained from <I>exhaustive</I> EPG digestions, displayed a linear relationship with DM regardless of reaction pH (P < 0.001). Significant correlation coefficients between B S ¯ , B N ¯ , DB<SUB>abs</SUB>, and DM manifested the effectiveness of the block information gained from both EPG digestion to estimate DMB distribution pattern (P < 0.05). However, comparison of block distribution information of three isozymes revealed that difference in block pattern could be manifested by parameters from <I>limited</I> EPG digest ( B S ¯ , B N ¯ ) but not by those from <I>exhaustive</I> digest (DB/DB<SUB>abs</SUB>). The results suggested the possibility to control B S ¯ and to customize specific population of demethylesterified pectin molecules using PME isozymes from Valencia orange.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pectin methylesterase <I>from citrus</I> was used to demethylesterify a model homogalacturonan. </LI> <LI> Average demethylesterified block size ( B S ¯ ) and number ( B N ¯ ) differed depending on DM and pH. </LI> <LI> <I>In silico</I> modeled processive multiple attack mode of action best explained block distributions. </LI> <LI> Significant correlation between B S ¯ , B N ¯ , absolute degree of blockiness (DB<SUB>abs</SUB>) and DM was observed. </LI> <LI> B S ¯ & B N ¯ manifested difference in block distribution among three citrus isozymes but DB<SUB>abs</SUB> could not. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fully-printed, all-polymer, bendable and highly transparent complementary logic circuits
Mandal, S.,Dell'Erba, G.,Luzio, A.,Bucella, S.G.,Perinot, A.,Calloni, A.,Berti, G.,Bussetti, G.,Duo, L.,Facchetti, A.,Noh, Y.Y.,Caironi, M. Elsevier Science 2015 ORGANIC ELECTRONICS Vol.20 No.-
In this contribution we show a simple approach for the development of all-polymer based complementary logic circuits fabricated by printing on plastic, at low temperature and in ambient conditions. This is achieved by patterning, with a bottom-up approach, solely synthetic carbon-based materials, thus incorporating earth-abundant elements and enabling in perspective the recycling - a critical aspect for low-cost, disposable electronics. Though very simple, the approach leads to logic stages with a delay down to 30μs, the shortest reported to date for all-polymer circuits, where each single component has been printed. Moreover, our circuits combine bendability and high transparency, favoring the adoption in several innovative applications for portable and wearable large-area electronics.
Kim, Yang,Cameron, Randall G.,Williams, Martin A.K.,Luzio, Gary A. Elsevier 2018 Food hydrocolloids Vol.77 No.-
<P><B>Abstract</B></P> <P>We explored the possibility of controlling charge distribution in the homogalacturonan regions of pectin to produce a population of demethylesterified molecules with desirable functional properties by utilizing consecutive treatments with pectin methylesterases (PME) having different modes of action. A fungal PME from <I>Aspergillus aculeatus</I> (<I>Aa</I>-PME), with a pseudo-random mode of action, was used to demethylesterify a extremely high methylesterified HG (DM 94%, average degree of polymerization 246) by reducing the degree of methylesterification (DM) from 94% to either 70% or 80%. A second demethylesterification step, to 50% DM, was performed using a processive PME from <I>Carica papaya</I> (<I>CpL</I>-PME). Introduced demethylesterified blocks were released either by exhaustive or limited endo polygalacturonase (EPG) digestion. Degree of blockiness (DB), absolute degree of blockiness (DB<SUB>abs</SUB>), average demethylesterified block size ( B S ¯ ) and number of average sized demethylesterified blocks per molecule ( B N ¯ ) were estimated. B S ¯ and B N ¯ as well as DB/DB<SUB>abs</SUB> differed depending on the initial DM reduction by <I>Aa</I>PME, the number of activity units of <I>CpL</I>PME used and the reaction pH (<I>P</I> < 0.05). Consecutive demethylesterification of HG by <I>AaPME</I> to 80% DM and then by <I>CpL</I>PME to 50% DM at pH 4.5 produced significantly longer oligomer blocks compared to <I>Aa-PME</I> demethylesterification to 70% DM followed by <I>CpL</I>-PME to 50% DM at pH 7.0. Limited EPG digestion released nearly intact demethylesterified blocks and the released oligomers were coupled with <I>in silico</I> modeling. Resulting oligomer distribution corresponded to the <I>in silico</I> mode of action representing contiguous demethylesterification of 10 GalA residues rather than that of random or complete block-wise demethylesterification. Calcium-mediated gels of the modified HGs displayed G′ higher than G″ values and both moduli differed significantly according to the amount of <I>CpL</I>PME applied even though their final DMs were identical. These results suggest the possibility of controlling B S ¯ and engineering a population of demethylesterified pectin molecules with specified demethylesterified B S ¯ and functional properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fungal and a plant pectin methylesterase were sequentially applied to a model homogalacturonan. </LI> <LI> Average demethylesterified block size and number differed based on the treatment. </LI> <LI> A processive multiple attack mode of action best explained block distributions. </LI> <LI> Significant correlations between B S ¯ , B N ¯ , degree of blockiness and G′ were observed. </LI> <LI> Functional properties could be customized using PMEs of different mode of actions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>