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11 results for “Sporopollenin”
Fig. 4 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 4. ATR-FTIR spectra of (i) P. ponderosa pollen, (ii) enzymatically-isolated sporopollenin, (iii) sporopollenin isolated by acidolysis with phosphoric acid, and (iv) sporopollenin isolated by acetolysis. Original data files are deposited with the accompanying Data in Brief article (Lutzke et al., 2019).
Fig. 6 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 6. ATR-FTIR spectra of (i) enzymatically-isolated sporopollenin, (ii) trans- 4-hydroxycinnamic acid, (iii) trans-4-hydroxy-3-methoxycinnamic acid, (iv) trans-4-methoxycinnamic acid, and (v) methyl trans-4-hydroxycinnamate. Original data files are deposited with the accompanying Data in Brief article (Lutzke et al., 2019).
Fig. 2 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 2. Examples of (a) α-pyrone biosynthesis in the exine and (b) carotenoids that may be oxidatively polymerized to form sporopollenin according to the hypothesis of Brooks and Shaw (1968).
Fig. 7 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 7. Scheme depicting the synthesis of acetonides (cyclic ketals) from 1,2- or 1,3-diols naturally present in sporopollenin, followed by hydrolysis under acidic conditions. This process corresponds to the spectroscopic changes observed in Figure S21.
Fig. 1 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 1. Scheme depicting enzymes involved in sporopollenin synthesis and selected degradation products. (a) Mid-chain oxidation of fatty acid substrates by CYP703A2, ω-oxidation by CYP704B1 and CYP704B2, and reduction of an activated fatty acid substrate by MS2. (b) Proposed sporopollenin monomer identified by Li et al. (2019). (c) The sporopollenin degradation products trans-4-hydroxycinnamic acid, trans-4-hydroxy-3-methoxycinnamic acid, and 7-hydroxyhexadecanedioic acid.
Fig. 8 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 8. ATR-FTIR spectra of (i) enzymatically-isolated sporopollenin, (ii) trans- 4-hydroxycinnamic acid, (iii) trans-4-hydroxy-3-methoxycinnamic acid, (iv) trans-4-methoxycinnamic acid, and (v) methyl trans-4-hydroxycinnamate. Original data files are deposited with the accompanying Data in Brief article (Lutzke et al., 2019).
Fig. 9 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 9. The relationship between IR band assignments and hypothesized structural components of sporopollenin.
Fig. 5 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 5. ATR-FTIR spectra of (i) enzymatically-isolated sporopollenin, (ii) sporopollenin isolated by acidolysis with phosphoric acid, and (iii) sporopollenin isolated by acetolysis. Distinct bands or shoulders with diagnostic importance are assigned a unique identifier in Table 3. Original data files are deposited with the accompanying Data in Brief article (Lutzke et al., 2019).
Data from: New sporopollenin-based β-cyclodextrin functionalized magnetic hybrid adsorbent for magnetic solid-phase extraction of nonsteroidal anti-inflammatory drugs from water samples.
A magnetic solid-phase extraction (MSPE) procedure on the newly synthesized magnetic β-cyclodextrin functionalized with toluene diisocyanate (TDI) as a linker and was further modified with bio-polymeric spores of sporopollenin (MSp-TDI-βCD) was developed for the extraction of nonsteroidal anti-inflammatory drugs (NSAIDs) namely indoprofen (INP), ketoprofen (KTP), ibuprofen (IBP) and fenoprofen (FNP) from water samples prior to their HPLC-DAD determination. The newly synthesised MSp-TDI-βCD was comprehensibly characterized using FT-IR, XRD, SEM-EDX, BET and VSM analyses. The separation of selected NSAIDs on MSp-TDI-βCD from aqueous solution was simply achieved by applying an external magnetic field via a permanent magnet. The MSPE parameters affecting extraction performance i.e., sorbent dosage, sample volume, extraction and desorption time, type of organic eluent and volume and solution pH were investigated and optimized. The proposed method showed linear range between 0.5 - 500 ng/mL, low limit of detection at S/N = 3 (0.16 - 0.37 ng/mL) and limit of quantification at S/N = 10 (0.53 - 1.22 ng/mL). The interday (n = 15) and intraday (n = 5) precision for the proposed methods given by relative standard deviation (RSD%) in the range of 2.5 - 4.0 and 2.1 - 5.5 respectively. The extraction recoveries of NSAIDs from environmental samples (tap, drinking and river water) ranged from 92.5 - 123.6%, with satisfactory precision (RSD% less than 12.4%).
Fig. 3 in Detailed characterization of Pinus ponderosa sporopollenin by infrared spectroscopy
Fig. 3. Model compounds used in the infrared characterization of sporopollenin.
Data from: New sporopollenin-based β-cyclodextrin functionalized magnetic hybrid adsorbent for magnetic solid-phase extraction of nonsteroidal anti-inflammatory drugs from water samples.
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