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De la Cruz LG, Abt T, León N, Wang L, Sánchez-Soto M. Ice-Template Crosslinked PVA Aerogels Modified with Tannic Acid and Sodium Alginate. Gels 2022; 8:gels8070419. [PMID: 35877504 PMCID: PMC9321210 DOI: 10.3390/gels8070419] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 06/25/2022] [Accepted: 07/02/2022] [Indexed: 12/24/2022] Open
Abstract
With the commitment to reducing environmental impact, bio-based and biodegradable aerogels may be one approach when looking for greener solutions with similar attributes to current foam-like materials. This study aimed to enhance the mechanical, thermal, and flame-retardant behavior of poly(vinyl alcohol) (PVA) aerogels by adding sodium alginate (SA) and tannic acid (TA). Aerogels were obtained by freeze-drying and post-ion crosslinking through calcium chloride (CaCl2) and boric acid (H3BO3) solutions. The incorporation of TA and SA enhanced the PVA aerogel’s mechanical properties, as shown by their high compressive specific moduli, reaching up to a six-fold increase after crosslinking and drying. The PVA/TA/SA aerogels presented a thermal conductivity of 0.043 to 0.046 W/m·K, while crosslinked ones showed higher values (0.049 to 0.060 W/m·K). Under TGA pyrolytic conditions, char layer formation reduced the thermal degradation rate of samples. After crosslinking, a seven-fold decrease in the thermal degradation rate was observed, confirming the high thermal stability of the formed foams. Regarding flammability, aerogels were tested through cone calorimetry. PVA/TA/SA aerogels showed a significant drop in the main parameters, such as the heat release rate (HRR) and the fire growth (FIGRA). The ion crosslinking resulted in a further reduction, confirming the improvement in the fire resistance of the modified compositions.
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Affiliation(s)
- Lucía G. De la Cruz
- Centre Català del Plàstic, Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. d’Eduard Maristany, 16, 08019 Barcelona, Spain; (L.G.D.l.C.); (T.A.); (N.L.)
| | - Tobias Abt
- Centre Català del Plàstic, Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. d’Eduard Maristany, 16, 08019 Barcelona, Spain; (L.G.D.l.C.); (T.A.); (N.L.)
| | - Noel León
- Centre Català del Plàstic, Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. d’Eduard Maristany, 16, 08019 Barcelona, Spain; (L.G.D.l.C.); (T.A.); (N.L.)
| | - Liang Wang
- Key Laboratory of Advanced Textiles Composites of Ministry of Education, Tiangong University, Binshui West Road 399, Xiqing District, Tianjin 300387, China;
| | - Miguel Sánchez-Soto
- Centre Català del Plàstic, Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. d’Eduard Maristany, 16, 08019 Barcelona, Spain; (L.G.D.l.C.); (T.A.); (N.L.)
- Correspondence: ; Tel.:+34-937398140
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Abt T, Kamrani MR, Cailloux J, Santana O, Sánchez‐Soto M. Modification of poly(lactic) acid by reactive extrusion and its melt blending with acrylonitrile–butadiene–styrene. POLYM INT 2020. [DOI: 10.1002/pi.6014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tobias Abt
- Centre Català del PlàsticUniversitat Politécnica de Catalunya Barcelona Tech (UPC‐EEBE) Terrassa Spain
| | - Mohammad Reza Kamrani
- Centre Català del PlàsticUniversitat Politécnica de Catalunya Barcelona Tech (UPC‐EEBE) Terrassa Spain
| | - Jonathan Cailloux
- Centre Català del PlàsticUniversitat Politécnica de Catalunya Barcelona Tech (UPC‐EEBE) Terrassa Spain
| | - Orlando Santana
- Centre Català del PlàsticUniversitat Politécnica de Catalunya Barcelona Tech (UPC‐EEBE) Terrassa Spain
| | - Miguel Sánchez‐Soto
- Centre Català del PlàsticUniversitat Politécnica de Catalunya Barcelona Tech (UPC‐EEBE) Terrassa Spain
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Youssef A, Kalaja I, Alkomi U, Abt T, Hoffmann RT, Reeps C, Weiss N, Karl Lackner H, Mahlmann A. Aortic stiffness and related complications after endovascular repair of blunt thoracic aortic injury in young patients. VASA 2020; 49:295-300. [DOI: 10.1024/0301-1526/a000858] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Summary: Background: This study aimed to evaluate the changes in aortic stiffness in young patients undergoing thoracic endovascular aortic repair (TEVAR) after blunt thoracic aortic injury (TBAI) and to examine the associated cardiovascular complications during follow-up. Patients and methods: We included survivors of TBAI who underwent stent graft placement between November 2009 and November 2019 and gave their consent to participate. Patients with relevant cardiovascular risk factors, comorbidities with potential impact on arterial stiffness, and prior aortic surgical or endovascular interventions were excluded. Fourteen TEVAR patients prospectively underwent clinical and noninvasive examinations and morphological imaging (mean time of follow-up and duration of implanted stent graft: 5.3 ± 1.8 years; mean age: 35.1 ± 8.7 years) and were compared to 14 healthy controls (matched for sex, age, height, and body mass index) in order to evaluate aortic stiffness. During the follow-up examinations, we assessed the pulse wave velocity (PWV; m/s) and development of arterial hypertension or heart failure, as indicated by N-terminal pro-brain natriuretic peptide (NT-proBNP; pg/mL) levels and performed echocardiography. Results: A significant increase in PWV values was recorded in the TEVAR group (median = 10.1; interquartile range [IQR] = 8.9–11.6) compared to the healthy controls (median = 7.3; IQR = 6.7–8.4), with an increase in the rank mean PWV (+ 3.8; Mann-Whitney U test p < .001). NT-proBNP levels of patients after TEVAR did not vary significantly compared to those of healthy controls (Mann-Whitney U test, p = .154). After TEVAR, five patients developed arterial hypertension during the follow-up, and three of them exhibited diastolic dysfunction. Conclusions: In young patients, TEVAR after TBAI may cause adverse cardiovascular complications due to increased aortic stiffness; therefore, screening for arterial hypertension during follow-up is recommended.
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Affiliation(s)
- Akram Youssef
- Division of Cardiology and Angiology, Department of Internal Medicine I, Hospital Chemnitz, Germany
| | - Igli Kalaja
- University Centre for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Usama Alkomi
- Division of Cardiology and Angiology, Department of Internal Medicine I, Hospital Chemnitz, Germany
| | - Tobias Abt
- University Centre for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Ralf-Thorsten Hoffmann
- University Centre for Vascular Medicine and Institute for Diagnostic Radiology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Christian Reeps
- University Centre for Vascular Medicine and Department of Vascular Surgery, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Norbert Weiss
- University Centre for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
| | - Helmut Karl Lackner
- Otto Loewi Research Center (for Vascular Biology, Immunology and Inflammation), Division of Physiology, Medical University of Graz, Austria
| | - Adrian Mahlmann
- University Centre for Vascular Medicine and Division of Angiology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Germany
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García-Masabet V, Santana Pérez O, Cailloux J, Abt T, Sánchez-Soto M, Carrasco F, Maspoch ML. PLA/PA Bio-Blends: Induced Morphology by Extrusion. Polymers (Basel) 2019; 12:E10. [PMID: 31861652 PMCID: PMC7022582 DOI: 10.3390/polym12010010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 12/12/2019] [Accepted: 12/14/2019] [Indexed: 11/29/2022] Open
Abstract
The effect of processing conditions on the final morphology of Poly(Lactic Acid) (PLA) with bio-based Polyamide 10.10 (PA) 70/30 blends is analyzed in this paper. Two types of PLA were used: Commercial (neat PLA) and a rheologically modified PLA (PLAREx), with higher melt elasticity produced by reactive extrusion. To evaluate the ability of in situ micro-fibrillation (f) of PA phase during blend compounding by twin-screw extrusion, two processing parameters were varied: i) Screw speed rotation (rpm); and ii) take-up velocity, to induce a hot stretching with different Draw Ratios (DR). The potential ability of PA-f in both bio-blends was evaluated by the viscosity (p) and elasticity (k') ratios determined from the rheological tests of pristine polymers. When PLAREx was used, the requirements for PA-f was fulfilled in the shear rate range observed at the extrusion die. Scanning electron microscopy (SEM) observations revealed that, unlike neat PLA, PLAREx promoted PA-f without hot stretching and the aspect ratio increased as DR increased. For neat PLA-based blends, PA-f was promoted during the hot stretching stage. DMTA analysis revealed that the use of PLAREx PLAREx resulted in a better mechanical performance in the rubbery region (T > Tg PLA-phase) due to the PA-f morphology obtained.
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Affiliation(s)
- Violeta García-Masabet
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
| | - Orlando Santana Pérez
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
| | - Jonathan Cailloux
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
| | - Tobias Abt
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
| | - Miguel Sánchez-Soto
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
| | - Félix Carrasco
- Department of Chemical Engineering, Universitat de Girona (UdG), Campus Montilivi s/n, 17071 Girona, Spain;
| | - María Lluïsa Maspoch
- Centre Català del Plàstic (CCP)-Universitat Politécnica de Catalunya Barcelona Tech (UPC-EEBE), C/Colom 114, 08222 Terrassa, Spain; (V.G.-M.); (J.C.); (T.A.); (M.S.-S.); (M.L.M.)
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Cailloux J, Abt T, Garcia-Masabet V, Santana O, Sanchez-Soto M, Carrasco F, Maspoch ML. Effect of the viscosity ratio on the PLA/PA10.10 bioblends morphology and mechanical properties. EXPRESS POLYM LETT 2018. [DOI: 10.3144/expresspolymlett.2018.47] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Affiliation(s)
- Liang Wang
- Centre Catalá del Plástic; Universitat Politécnica de Catalunya; Barcelona Tech. C/ Colom 114 08222 Terrassa Spain
| | - Miguel Sánchez-Soto
- Centre Catalá del Plástic; Universitat Politécnica de Catalunya; Barcelona Tech. C/ Colom 114 08222 Terrassa Spain
| | - Tobias Abt
- Centre Catalá del Plástic; Universitat Politécnica de Catalunya; Barcelona Tech. C/ Colom 114 08222 Terrassa Spain
| | - Maria Lluisa Maspoch
- Centre Catalá del Plástic; Universitat Politécnica de Catalunya; Barcelona Tech. C/ Colom 114 08222 Terrassa Spain
| | - Orlando O Santana
- Centre Catalá del Plástic; Universitat Politécnica de Catalunya; Barcelona Tech. C/ Colom 114 08222 Terrassa Spain
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Abt T, Bou JJ, Sanchez-Soto M. Isocyanate toughening of pCBT/organoclay nanocomposites with exfoliated structure and enhanced mechanical properties. EXPRESS POLYM LETT 2014. [DOI: 10.3144/expresspolymlett.2014.96] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Abt T, Sánchez-Soto M, Illescas S, Aurrekoetxea J, Sarrionandia M. Toughening of in situ polymerized cyclic butylene terephthalate by addition of tetrahydrofuran. POLYM INT 2010. [DOI: 10.1002/pi.2977] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Zopf S, Neureiter D, Bouralexis S, Abt T, Glaser K, Okamoto K, Ganslmayer M, Hahn E, Herold C, Ocker M. Differential response of p53 and p21 on HDAC inhibitor-mediated apoptosis in HCT116 colon cancer cells in vitro and in vivo. Int J Oncol 2007. [DOI: 10.3892/ijo.31.6.1391] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Zopf S, Neureiter D, Bouralexis S, Abt T, Glaser KB, Okamoto K, Ganslmayer M, Hahn EG, Herold C, Ocker M. Differential response of p53 and p21 on HDAC inhibitor-mediated apoptosis in HCT116 colon cancer cells in vitro and in vivo. Int J Oncol 2007; 31:1391-1402. [PMID: 17982666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
We investigated the effect of a novel histone deacetylase inhibitor, A-423378.0, on the colon carcinoma cell line HCT116 and genetically modified derivatives lacking either p21(cip1/waf1) or p53. HCT116 cell lines were incubated with A-423378.0 at different concentrations for 3-120 h. Cell viability, proliferation and apoptosis rates were determined and verified by western blot, detection of mitochondrial membrane potential breakdown DeltaPsi(m), activation of caspases-3, -8 and cytokeratin 18 cleavage. A subcutaneous xenograft model was established in NMRI mice with daily intraperitoneal injections of 10 mg/kg for 14 days. All three HCT116 cell lines responded to A-423378.0 treatment in a dose- and time-dependent manner via induction of apoptosis as measured by breakdown of DeltaPsi(m) and BrdU incorporation. We identified that A-423378.0 induced the expression of TRAIL and TRAIL receptor, especially TRAIL-R2/hDR5, which was up-regulated in HCT116 cells after treatment with A-423378.0. In vivo, a growth inhibitory effect was observed with HDAC-I treatment, which was paralleled by a down-regulation of PCNA and a concomitant induction of apoptosis. Treatment of wild-type or knock-out HCT116 cells with A-423378.0 exerts potent anti-proliferative and pro-apoptotic effects in vitro and in vivo. A-423378.0 was able to induce apoptosis in both p21(WAF1) and p53 deficient tumour cells, which appeared to be mediated by the intrinsic cell death pathway. Interestingly, the effects of A-423378.0 on the extrinsic cell death pathway through activation of TRAIL and its signalling pathway indicate that A-423378.0 may be a potent new therapeutic compound for the treatment of advanced colorectal cancer.
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Affiliation(s)
- Steffen Zopf
- Department of Medicine 1, University Hospital Erlangen, D-91054, Erlangen, Germany
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Abt T, Hopfenmüller W, Mellerowicz H. [Shock wave therapy for recalcitrant plantar fasciitis with heel spur: a prospective randomized placebo-controlled double-blind study]. Z Orthop Ihre Grenzgeb 2002; 140:548-54. [PMID: 12226782 DOI: 10.1055/s-2002-34001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
AIM Efficacy of low-energy shock wave therapy for recalcitrant plantar fasciitis. METHOD 32 patients were randomly assigned into real and placebo ESWT groups, treatment comprised 1000 impulses of 0,08 mJ/mm 2 at 14 kV (OssaTron OSA 120, HMT AG, Switzerland) in 12 cases repeated after six weeks or placebo (energy-absorbing foil). Follow-up evaluation (19, 32 and 48 wks.) included specific questionnaire, clinical-functional examination and measurement of plantar pressure while walking (Emed AT-4. pedograph, Novel GmbH, Munich). Examiner and patients were blinded. RESULTS 88 % of the treatment group were pain free or had good results. None of the placebo group were pain free, 33.3 % had good results (Roles and Maudsley Score). The treatment group showed significantly better outcome for morning and resting pain, pressure stamp-tolerance and walking ability. Pedography did not show a clear correlation between pain relief and load pattern. CONCLUSION The results of this study corroborate the value of ESWT for recalcitrant plantar fascitis. As a non invasive technique with low side effects, it can complement the row of conservative treatments.
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Affiliation(s)
- T Abt
- Fachbereich Humanmedizin, Freie Universität Berlin, Germany
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