Abstract:
:Esters were prepared by acylation of hydroxypropyl cellulose with fatty acid catalyzed by immobilized lipase from Candida antarctica in tert-butanol. The nature of the substrates used, the initial water activity of the system, and the molecular weight of the hydroxypropyl cellulose were investigated. Moreover, Fourier transform-infrared (FT-IR) spectroscopy was used for determination of ester content on hydroxypropyl cellulose. Specifically, a linear relationship was established between the peak height assigned to the absorption of the esterified carboxyl groups of the cellulose and the ester content. At optimum reaction conditions, the ester content on the hydroxypropyl cellulose was about 11%.
journal_name
Biotechnol Bioengjournal_title
Biotechnology and bioengineeringauthors
Sereti V,Stamatis H,Pappas C,Polissiou M,Kolisis Fdoi
10.1002/1097-0290(20010220)72:4<495::aid-bit1012>3subject
Has Abstractpub_date
2001-02-20 00:00:00pages
495-500issue
4eissn
0006-3592issn
1097-0290pii
10.1002/1097-0290(20010220)72:4<495::AID-BIT1012>3journal_volume
72pub_type
杂志文章abstract::This study addresses the characterization of human islet-like structures generated from a newly discovered sparse population of precursor cells (Petropavlovskaia and Rosenberg, 2002) in the human pancreas. These cells may be progenitor cells capable of producing pancreatic cells suitable for the treatment of type 1 di...
journal_title:Biotechnology and bioengineering
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doi:10.1002/bit.20801
更新日期:2006-04-05 00:00:00
abstract::The paper reviews the state-of-the-art in computational modeling of thrombus formation and growth and related phenomena including platelet margination, activation, adhesion, and embolization. Presently, there is a high degree of empiricism in the modeling of thrombus formation. Based on the experimentally observed phy...
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abstract::Autotrophic or mixotrophic use of one-carbon (C1) compounds is gaining importance for sustainable bioproduction. In an effort to integrate the reductive glycine pathway (rGP) as a highly promising pathway for the assimilation of CO2 and formate, genes coding for glycine synthase system from Gottschalkia acidurici were...
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journal_title:Biotechnology and bioengineering
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abstract::Several experimental data on continuous cultures of hybridoma cells show that monoclonal antibody productivity is a decreasing function of dilution rate. It has been suggested that this unusual behavior may be due to the arrest of a fraction of cycling cells at a critical point of Phase G(1). Although this hypothesis ...
journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.260421109
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abstract::Natural oxygen gradients occur in tissues of biological organisms and also in the context of three-dimensional (3D) in vitro cultivation. Oxygen diffusion limitation and metabolic oxygen consumption by embedded cells produce areas of hypoxia in the tissue/matrix. However, reliable systems to detect oxygen gradients an...
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
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journal_title:Biotechnology and bioengineering
pub_type: 杂志文章
doi:10.1002/bit.20749
更新日期:2006-02-20 00:00:00
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journal_title:Biotechnology and bioengineering
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更新日期:2018-03-01 00:00:00
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journal_title:Biotechnology and bioengineering
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