Cowpea proteins. 2. Characterization of water-extractable proteins

1979 ◽  
Vol 27 (6) ◽  
pp. 1244-1247 ◽  
Author(s):  
S. Sefa-Dedeh ◽  
D. Stanley
Keyword(s):  
Water Extractable ◽  
Cowpea Proteins

scholarly journals Characterization of arabinoxylan degrading enzymes during wheat malting

2020 ◽  
Vol 185 ◽  
pp. 04014
Author(s):  
Bao Chu ◽  
Yanan Chai ◽  
Yuhong Jin ◽  
Zhaoan Zhang ◽  
Xiao Yang ◽  
...  
Keyword(s):  
Significant Positive Correlation ◽  
Degradation Products ◽  
Xylanase Activity ◽  
Degrading Enzyme ◽  
Positive Correlation ◽  
Heat Stable ◽  
Decline Rate ◽  
Wheat Germination ◽  
Water Extractable

In this paper the arabinoxylanase activities and the content of water-extractable arabinoxylans (WEAXs) including their degradation products in wheat Yannong 24 during the malting process were studied. The results showed that the endo-β-1,4-xylanase activity had a large increase during the steeping process, endo-β-1,4-xylanase and α-L-arabinofuranosidase achieved the highest activity on day 4 of germination. During malt kilning, endo-β-1,4-xylanase and α-L- arabinofuranosidase were not heat stable, and the activity decline rate were 65.88% and 69.58%; whereas malt β-D-xylosidase was resistant to heat and it’s activity decline rate was only 18.74%. It is during steeping and the first day of germination that the content of WEAXs and it’s degradation products (WEAXs+DP) dramatically increased, and this corresponded to the greater improvement of endo-β-1,4-xylanase activity in the same phase. The WEAXs+DP content has a very significant positive correlation with the endo-β-1,4-xylanase activity (0.892, p<0.01). It can be indicated that endo-β-1,4-xylanase is the main degrading enzyme in the degradation of WUAXs and the increase of the WEAXs content during steeping and the first day of wheat germination.

Isolation and structural characterization of the water-extractable polysaccharides from Cassia obtusifolia seeds

2012 ◽  
Vol 90 (2) ◽  
pp. 827-832 ◽  
Author(s):  
Mingsheng Shang ◽  
Xiaoman Zhang ◽  
Qun Dong ◽  
Jian Yao ◽  
Qin Liu ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Cassia Obtusifolia ◽  
Water Extractable

Extraction and characterization of water-extractable and water-unextractable arabinoxylans from spelt bran: Study of the hydrolysis conditions for monosaccharides analysis

2011 ◽  
Vol 53 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Emmanuelle Escarnot ◽  
Mario Aguedo ◽  
Richard Agneessens ◽  
Bernard Wathelet ◽  
Michel Paquot
Keyword(s):  
Hydrolysis Conditions ◽  
Water Extractable

scholarly journals Chemical characterization of water extractable organic matter from plants: A better understanding of soil dissolved organic matter sources and path in permafrost thawing regions 

2021 ◽  
Author(s):  
Alienor Allain ◽  
Marie Anne Alexis ◽  
Yannick Agnan ◽  
Guillaume Humbert ◽  
Edith Parlanti ◽  
...  
Keyword(s):  
Organic Matter ◽  
Solid State ◽  
Dissolved Organic Matter ◽  
Vascular Plants ◽  
Inorganic Material ◽  
Bulk Sample ◽  
Permafrost Thawing ◽  
Extractable Organic Matter ◽  
Water Extractable

&lt;p&gt;In present permafrost thawing context, dissolved organic matter (DOM) is a key component that controls organic and inorganic material transfer from soil to hydrographic systems. In terrestrial environments, vegetation is the main source of DOM, before degradation by microorganisms. DOM stoichiometry, aromaticity, composition or quantity control its fate, and referential data characterizing the initial DOM originating from plant biomass leaching are scarce.&lt;/p&gt;&lt;p&gt;To better understand its dynamic, this study focuses on the characterization of water extractable organic matter (&amp;#8220;WEOM&amp;#8221;: a proxy of DOM) of main plant species belonging to different plant functional types typical of the subarctic region (lichen, willow, birch, and &lt;em&gt;Eriophorum&lt;/em&gt;).&lt;/p&gt;&lt;p&gt;Dissolved organic carbon (C) and dissolved nitrogen (N) contents of WEOM samples were measured, as well as organic C and total N contents of ground plant leaf samples (&amp;#8220;bulk&amp;#8221; samples). C/N ratio of bulk samples and WEOM fractions were compared to evaluate the potential extractability of C and N. The composition of both WEOM and bulk samples were characterized through solid state &lt;sup&gt;13&lt;/sup&gt;C Nuclear Magnetic Resonance (NMR) and compared. Absorbance and 3D fluorescence measurements were also performed on WEOM samples to characterize their optical properties.&lt;/p&gt;&lt;p&gt;WEOM is significantly more extractable in vascular plants compared to non-vascular ones. Moreover, N is more extractable than C in all lichen species and &lt;em&gt;Eriophorum&lt;/em&gt;, whereas C is as extractable as N in &lt;em&gt;Salix &lt;/em&gt;and &lt;em&gt;Betula pubescens&lt;/em&gt; samples.&lt;em&gt; Betula nana&lt;/em&gt; is the only species with C more extractable than N.&lt;/p&gt;&lt;p&gt;The solid state &lt;sup&gt;13&lt;/sup&gt;C NMR spectra of bulk sample are very similar to the spectra of corresponding WEOM, except for &lt;em&gt;Eriophorum&lt;/em&gt;. For this species, carbonyl C contributes to 5% of bulk sample spectrum, compared to 14% of the WEOM spectrum.&lt;/p&gt;&lt;p&gt;Based on absorbance measurements, optical index were calculated: E2/E3 is significantly higher for non-vascular plants, whereas E2/E4, E3/E4 and slope ratio (S&lt;sub&gt;R&lt;/sub&gt;) do not show significant difference between plant functional types. In 3D fluorescence spectra, the contribution of &amp;#8220;Protein-like&amp;#8221; peak is lower for vascular plants compared to lichens, and is maximum for &lt;em&gt;Eriophorum&lt;/em&gt;.&lt;/p&gt;&lt;p&gt;Our results highlighted the influence of plant species on the quantity and quality of produced DOM: WEOM production process is different between vegetation species due to the quality, especially hydrophobicity and extractability of bulk OM components. The high contribution of C-N bonds in WEOM of &lt;em&gt;Eriophorum &lt;/em&gt;might be especially important for potential complexation between DOM and trace elements like cadmium (Nigam et al., 2000). Likewise, aromatic C observed only in vascular plant WEOM samples are known to bond have a good affinity with many elements like iron, vanadium and chromium (Gangloff et al., 2014). Under climate change, vegetation cover of the Arctic region is evolving with the moving of the treeline northward and a local increase of the proportion of shrubs (Berner et al., 2013). Accordingly, significant change of DOM composition are expected with potential influence on organic and inorganic material dynamics.&lt;/p&gt;&lt;p&gt;Berner et al., (2013). Glob. Chang. Biol. 19:3449-3462&lt;/p&gt;&lt;p&gt;Gangloff et al., (2014). Geochim. Cosmochim. Ac. 130:21-41&amp;#160;&amp;#160;&lt;/p&gt;&lt;p&gt;Nigam et al., (2000). Chem. Speciation Bioavailability 12:125-132&lt;/p&gt;

scholarly journals Characterization of water-extractable dicarboxylic acids in Neogene sediments of the Shinjo basin, Japan.

1996 ◽  
Vol 30 (4) ◽  
pp. 251-260 ◽  
Author(s):  
Hajime Mita ◽  
Ryusuke Shigematsu ◽  
Akira Shimoyama
Keyword(s):  
Dicarboxylic Acids ◽  
Neogene Sediments ◽  
Water Extractable

Characterization of water extractable organic matter in a deep soil profile

Chemosphere ◽  
2006 ◽  
Vol 62 (10) ◽  
pp. 1583-1590 ◽  
Author(s):  
Maddalena Corvasce ◽  
Adam Zsolnay ◽  
Valeria D’Orazio ◽  
Raffaele Lopez ◽  
Teodoro M. Miano
Keyword(s):  
Organic Matter ◽  
Soil Profile ◽  
Deep Soil ◽  
Extractable Organic Matter ◽  
Water Extractable

Spectroscopic characterization of water extractable organic matter during composting of municipal solid waste

Chemosphere ◽  
2011 ◽  
Vol 82 (4) ◽  
pp. 541-548 ◽  
Author(s):  
Xiaosong He ◽  
Beidou Xi ◽  
Zimin Wei ◽  
Xujing Guo ◽  
Mingxiao Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Spectroscopic Characterization ◽  
Extractable Organic Matter ◽  
Water Extractable
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