TY - JOUR A1 - Tung, Wing Tai A1 - Sun, Xianlei A1 - Wang, Weiwei A1 - Xu, Xun A1 - Ma, Nan A1 - Lendlein, Andreas T1 - Structure, mechanical properties and degradation behavior of electrospun PEEU fiber meshes and films JF - MRS advances : a journal of the Materials Research Society (MRS) N2 - The capability of a degradable implant to provide mechanical support depends on its degradation behavior. Hydrolytic degradation was studied for a polyesteretherurethane (PEEU70), which consists of poly(p-dioxanone) (PPDO) and poly(epsilon-caprolactone) (PCL) segments with a weight ratio of 70:30 linked by diurethane junction units. PEEU70 samples prepared in the form of meshes with average fiber diameters of 1.5 mu m (mesh1.5) and 1.2 mu m (mesh1.2), and films were sterilized and incubated in PBS at 37 degrees C with 5 vol% CO2 supply for 1 to 6 weeks. Degradation features, such as cracks or wrinkles, became apparent from week 4 for all samples. Mass loss was found to be 11 wt%, 6 wt%, and 4 wt% for mesh1.2, mesh1.5, and films at week 6. The elongation at break decreased to under 20% in two weeks for mesh1.2. In case of the other two samples, this level of degradation was achieved after 4 weeks. The weight average molecular weight of both PEEU70 mesh and film samples decreased to below 30 kg/mol when elongation at break dropped below 20%. The time period of sustained mechanical stability of PEEU70-based meshes depends on the fiber diameter and molecular weight. Y1 - 2021 U6 - https://doi.org/10.1557/s43580-020-00001-0 SN - 2059-8521 VL - 6 IS - 10 SP - 276 EP - 282 PB - Springer Nature Switzerland AG CY - Cham ER - TY - JOUR A1 - Figueroa Campos, Gustavo Adolfo A1 - Perez, Jeffrey Paulo H. A1 - Block, Inga A1 - Sagu Tchewonpi, Sorel A1 - Saravia Celis, Pedro A1 - Taubert, Andreas A1 - Rawel, Harshadrai Manilal T1 - Preparation of activated carbons from spent coffee and coffee parchment and assessment of their adsorbent efficiency JF - Processes : open access journal N2 - The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investigated. The aim of this work was to prepare activated carbon from spent coffee grounds and parchment, and to assess their adsorption performance. The co-calcination processing with calcium carbonate was used to prepare the activated carbons, and their adsorption capacity for organic acids, phenolic compounds and proteins was evaluated. Both spent coffee grounds and parchment showed yields after the calcination and washing treatments of around 9.0%. The adsorption of lactic acid was found to be optimal at pH 2. The maximum adsorption capacity of lactic acid with standard commercial granular activated carbon was 73.78 mg/g, while the values of 32.33 and 14.73 mg/g were registered for the parchment and spent coffee grounds activated carbons, respectively. The Langmuir isotherm showed that lactic acid was adsorbed as a monolayer and distributed homogeneously on the surface. Around 50% of total phenols and protein content from coffee wastewater were adsorbed after treatment with the prepared activated carbons, while 44, 43, and up to 84% of hydrophobic compounds were removed using parchment, spent coffee grounds and commercial activated carbon, respectively; the adsorption efficiencies of hydrophilic compounds ranged between 13 and 48%. Finally, these results illustrate the potential valorization of coffee by-products parchment and spent coffee grounds into activated carbon and their use as low-cost adsorbent for the removal of organic compounds from aqueous solutions. KW - coffee by-products KW - spent coffee grounds KW - parchment KW - valorization KW - calcination KW - activated carbon KW - organic compounds adsorption Y1 - 2021 U6 - https://doi.org/10.3390/pr9081396 SN - 2227-9717 VL - 9 IS - 8 PB - MDPI CY - Basel ER - TY - JOUR A1 - Buyinza, Daniel A1 - Derese, Solomon A1 - Ndakala, Albert A1 - Heydenreich, Matthias A1 - Yenesew, Abiy A1 - Koch, Andreas A1 - Oriko, Richard T1 - A coumestan and a coumaronochromone from Millettia lasiantha JF - Biochemical systematics and ecology N2 - The manuscript describes the phytochemical investigation of the roots, leaves and stem bark of Millettia lasiantha resulting in the isolation of twelve compounds including two new isomeric isoflavones lascoumestan and las-coumaronochromone. The structures of the new compounds were determined using different spectroscopic techniques. KW - Millettia lasiantha KW - Leguminosae KW - Coumestan KW - Coumaronochromone Y1 - 2021 U6 - https://doi.org/10.1016/j.bse.2021.104277 SN - 0305-1978 SN - 1873-2925 VL - 97 PB - Elsevier CY - Oxford ER - TY - CHAP A1 - Ramadan, Shahenda A1 - Guerrero, Paula A1 - Nedielkov, Ruslan A1 - Klishin, Nikolai A1 - Dimova, Rumiana A1 - Silva, Daniel V. A1 - Möller, Heiko T1 - Building a mimetic system for unraveling protein-protein interactions on membranes T2 - European biophysics journal : with biophysics letters ; an international journal of biophysics Y1 - 2021 U6 - https://doi.org/10.1007/s00249-021-01558-w SN - 0175-7571 SN - 1432-1017 VL - 50 IS - SUPPL 1 SP - S153 EP - S153 PB - Springer CY - Berlin ; Heidelberg ; New York ER -