ORCID Profile
0000-0001-5173-1178
Current Organisations
Nanchang University
,
Shiraz University
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Publisher: Elsevier BV
Date: 10-2019
Publisher: Hindawi Limited
Date: 20-11-2201
DOI: 10.1111/JFPP.12650
Publisher: Hindawi Limited
Date: 02-11-2020
DOI: 10.1111/JFPP.14964
Publisher: Hindawi Limited
Date: 20-11-2015
DOI: 10.1111/JFPP.12644
Publisher: Oxford University Press (OUP)
Date: 14-09-2023
Publisher: Oxford University Press (OUP)
Date: 31-08-2023
Abstract: GW190814 was reported during LIGO’s and Virgo’s third observing run with the most asymmetric component masses (a ∼23 M⊙ black hole and a ∼2.6 M⊙ compact object). Under the assumption that this event is a binary black hole (BBH) merger formed through the isolated binary evolution channel, we reanalyze the publicly released data of GW190814 with the modified astrophysical priors on the effective spin χeff, and further explore its formation history using detailed binary modeling. We show that GW190814 is likely to have been formed through the classical common envelope channel. Our findings show that the properties inferred using the modified astrophysical priors are consistent with those inferred by the uniform priors. With the newly-inferred properties of GW190814, we perform detailed binary evolution of the immediate progenitor of the BBH (namely a close binary system composed of a BH and a helium star) in a large parameter space, taking into account mass-loss, internal differential rotation, supernova kicks, and tidal interactions between the helium star and the BH companion. Our findings show that GW190814-like events could be formed in limited initial conditions just after the common envelope phase: a ∼23 M⊙ BH and a helium star of MZamsHe ∼ 8.5 M⊙ at solar metallicity (∼ 7.5 M⊙ at 10% solar metallicity) with an initial orbital period at around 1.0 day. Additionally, the inferred low spin of the secondary indicates that the required metallicity for reproducing GW190814-like events should not be too low (e.g., Z ≳ 0.1 Z⊙).
Publisher: MDPI AG
Date: 07-11-2018
DOI: 10.3390/NANO8110919
Abstract: In this work, hybrid gliadin electrospun fibers containing inclusion complexes of ferulic acid (FA) with hydroxypropyl-beta-cyclodextrins (FA/HP-β-CD-IC) were prepared as a strategy to increase the stability and solubility of the antioxidant FA. Inclusion complex formation between FA and HP-β-CD was confirmed by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC), and X-ray diffraction (XRD). After adjusting the electrospinning conditions, beaded-free fibers of gliadin incorporating FA/HP-β-CD-IC with average fiber diameters ranging from 269.91 ± 73.53 to 271.68 ± 72.76 nm were obtained. Control gliadin fibers containing free FA were also produced for comparison purposes. The incorporation of FA within the cyclodextrin molecules resulted in increased thermal stability of the antioxidant compound. Moreover, formation of the inclusion complexes also enhanced the FA photostability, as after exposing the electrospun fibers to UV light during 60 min, photodegradation of the compound was reduced in more than 30%. Moreover, a slower degradation rate was also observed when compared to the fibers containing the free FA. Results from the release into two food simulants (ethanol 10% and acetic acid 3%) and PBS also demonstrated that the formation of the inclusion complexes successfully resulted in improved solubility, as reflected from the faster and greater release of the compounds in the three assayed media. Moreover, in both types of hybrid fibers, the antioxidant capacity of FA was kept, thus confirming the suitability of electrospinning for the encapsulation of sensitive compounds, giving raise to nanostructures with potential as active packaging structures or delivery systems of use in pharmaceutical or biomedical applications.
Publisher: Elsevier BV
Date: 02-2019
DOI: 10.1016/J.FOODRES.2018.10.027
Abstract: This paper presents a comprehensive study on the electrohydrodynamic processing of gliadin to develop food-grade delivery systems with different morphologies. The effects of biopolymer concentration, applied voltage and solution flow-rate on particle morphology, molecular organisation, crystallinity and thermal properties were investigated. Gliadin concentration influenced the apparent viscosity and conductivity of the solutions, giving raise to particle morphologies at 10 wt% gliadin and beaded-free fibers above 25 wt% gliadin. In general, increasing the voltage resulted in smaller average sizes of the obtained structures, while no significant differences in morphology were observed among the tested flow rates. Interestingly, the amide I position in the FTIR reflected changes in protein conformation which could be correlated with the final morphology attained. Moreover, the acetic acid used for solution preparation disrupted the original amino acid chain packing of the gliadin fraction, being the electrospun/electrosprayed s les amorphous. These gliadin-based microparticles and microfibers obtained could serve as food-grade delivery vehicles.
Publisher: Walter de Gruyter GmbH
Date: 10-2017
Abstract: In this study, the effects of salt concentration (1, 3 and 6% w/v) and ultrasound pretreatment (50 W for 5, 10 and 15 minutes) on extraction parameters and extracted essential oil from peppermint by ohmic-assisted hydrodistillation (OAHD), a recently innovated extraction technique, have been studied. The results showed that salt concentration significantly affected the extraction parameters of OAHD, while ultrasound pretreatment had negligible effect. Sudden eruption of essential oil glands was observed in scanning electron micrographs of all OAHDs mint leaves. GC-MS analysis did not indicate any noticeable change in the compounds of all the extracted essential oils. The results of this study showed that increase of electrolyte concentration could speed up OAHD process without any adverse effect on essential oil quality, while ultrasound pretreatment neither reduced process time nor increased extraction yield of OAHD.
No related grants have been discovered for Mohammad-Taghi Golmakani.