Characterization of Tannin-Based Resins from the Barks of &amp;lt;i&amp;gt;Ficus platyphylla&amp;lt;/i&amp;gt; and of &amp;lt;i&amp;gt;Vitellaria paradoxa&amp;lt;/i&amp;gt;: Composites’ Performances and Applications

Ntenga, Richard; Pagore, Frederic Djoda; Pizzi, A.; Mfoumou, Etienne; Ohandja, Louis-Max Ayina

doi:10.4236/msa.2017.812066

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…The bending vibration of C-O-C groups detected carbohydrates at a frequency of 1007 cm ₋1 . The aromatic rings' skeletal stretching vibration and the C-O-C group of the flavonoids were both matched by the band at 1352 cm ₋1 [32]. Phenolic compounds, identified as cyanidin compounds by the absorption spectra of anthocyanins, are confirmed to be present in the microcapsules as O-H symmetric stretching vibration at 3100-3400 cm ₋1 , C-H aliphatic at 2900-2840 cm ₋1 , C-H aromatic at 675-870 cm ₋1 , and C=C aromatic at 1660 cm ₋1 [33].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 82%

In Vitro Antioxidant Activity, Bioaccessibility, and Thermal Stability of Encapsulated Strawberry Fruit (Fragaria × ananassa) Polyphenols

Seke,

Adiamo,

Sultanbawa

et al. 2023

Foods

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Bioactive compounds in red fruits, such as strawberries, are vulnerable to digestion, and encapsulation has become an alternative for their protection. This study aims at encapsulating strawberry juice (SJ) by freeze-drying with pea protein and okra mucilage (SJPO), pea protein and psyllium mucilage (SJPP), and pea protein, psyllium mucilage, and okra mucilage (SJPPO) and investigating the in vitro release. The highest encapsulation efficiency was observed in capsule SJPPO (95.38%) and the lowest efficiency in SJPO (82.45%). Scanning electron microscopy revealed an amorphous glassy structure for the structure of the strawberry microcapsules, and X-ray diffraction confirmed that observation. However, X-ray diffraction further showed that SJPPO was crystalline, indicating a tighter crosslinking density than the other microcapsules. Fourier transform infrared spectroscopy showed peaks at 3390 and 1650 cm−1, confirming the presence of polyphenols and polysaccharides in the strawberry microcapsules. Thermal stability was higher for SJPPO, and the observed thermal transitions were due to the bonds formed between the polymers and polyphenols. Pelargonidin 3-glucoside, cyanidin 3-glucoside, cyanidin, delphinidin, malvidin 3-glucoside, ellagic acid, chlorogenic acid, catechin, and kaempferol were identified in the strawberry microcapsules. Digestion affected the compounds’ content; the bioaccessibility for SJ was 39.26% and 45.43% for TPC and TAC, respectively. However, encapsulation improved the bioaccessibility of both TPC (SJPP, 51.54%; SJPO, 48.52%; and SJPPO, 54.39%) and TAC (SJPP, 61.08%; SJPO, 55.03%; and SJPPO, 71.93%). Thus, encapsulating pea protein isolate, psyllium mucilage, and okra mucilage is an effective method to facilitate targeted release and preserve the biological activities of fruits.

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Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 82%

In Vitro Antioxidant Activity, Bioaccessibility, and Thermal Stability of Encapsulated Strawberry Fruit (Fragaria × ananassa) Polyphenols

Seke,

Adiamo,

Sultanbawa

et al. 2023

Foods

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“…The peaks observed at 1,567 cm -1 for M. caesalpiniifolia and A. indica, 1,468 cm -1 for M. tenuifl ora and 1,566 cm -1 for A. mangium confi rm the stretching vibration of C=C aromatic ring bonds present in condensed tannins (Ntenga et al, 2017;Sartori et al, 2018). The peaks located at 1,450 cm -1 (M. caesalpiniifolia), 1,447 cm -1 (A. indica) and 1,454 cm -1 (A. mangium) particularly result from the combination of aromatic bending of C-H, stretching of C-O and deformation of C-OH (Konai et al 2017).…”

Section: 2ftir Characterizationmentioning

confidence: 94%

Extraction, Quantification, and Ftir Characterization of Bark Tannins of Four Forest Species Grown in Northeast Brazil

et al. 2021

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Condensed tannins are chemical compounds derived from the secondary metabolism of plants. They are of particular interest due to their broad range of technological uses and applications. The objective of this study was to extract, quantify, and characterize by Fourier-transform infrared spectroscopy (FTIR) the bark tannins of four forest species grown in Northeast Brazil: Acacia mangium, Azadirachta indica, Mimosa tenuiflora, and Mimosa caesalpiniifolia. Bark samples were collected from 5 trees of each species grown in a five-year-old forest stand. Samples were collected, grounded, and submitted to extraction with hot water, then measured to determine total solids content (TSC), Stiasny number (SN), and condensed tannins content (CTC). FTIR spectra were acquired from tannin samples fixed in potassium bromide pellets. Among the four species, M. tenuiflora presented the highest CTC, equal to 23.4%, and the purest crude hot-water extract with SN of 91.27%. Based on FTIR characterization, tannins from M. caesalpiniifolia, A. indica, and A. mangium barks were classified as proanthocyanidins and those from M. tenuiflora bark as prodelphinidins.

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“…For both types of tannins (before and after cationization), the spectral bands from 1,580 to 1,615; and 1,450 to 1,510 cm -1 of aromatic stretching (C=C from aromatic rings) were observed with peaks of strong and medium intensities. According to Ntenga et al (2017), intense peaks of aromatic C=C bonds combined with a high Stiasny number can be considered an indicator of the purity of tannic extracts. However, despite the presence of similar strong peaks in the spectra of the cashew tree bark observed in Figure 1, high purity was not detected, since the Stiasny number in the hot-water extracts was 59.5% (Table 1).…”

Section: Ftir Analysesmentioning

confidence: 99%

Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification

Anjos¹,

Azevêdo²,

Silva³

et al. 2022

Rev. ambiente água

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Concern about the overexploitation of natural resources has increased in recent decades, especially involving water and its treatment. Paradoxically, one of the sources of water pollution is the treatment itself, due to the use of chemical flocculants, which end up generating sludge that may be highly aggressive to the environment. One of the ways to solve this problem is to use natural flocculants for this purpose, since they are biodegradable and do not harm nature. This study evaluated the efficiency of a natural flocculant produced from tannins extracted from the bark of the cashew tree (Anacardium occidentale) and compared it with two commercial coagulants, Tanfloc® and iron chloride. The water for treatment was collected from a weir. The cashew trees’ bark was collected, ground, and submitted to hot-water extraction to yield the tannins, and the extraction product was cationized. The flocculation tests were carried out using the jar test with solutions having concentrations of 33.3, 66.7, and 100 mg L-1. Turbidity and pH were analyzed before and after flocculation. Among the assessed flocculants, the cationized tannins produced the best responses both for removal of turbidity and final pH of the treated water. Tanfloc® also produced satisfactory results regarding turbidity removal. The iron chloride, besides not properly clarifying the water, left it very acidic. Since the cationized tannins practically did not change the pH and were effective in the removal of turbidity, they represent an interesting, sustainable alternative product to treat the water. Keywords: cationized tannins, natural flocculating agente, removal of turbidity, water treatment.

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Characterization of Tannin-Based Resins from the Barks of <i>Ficus platyphylla</i> and of <i>Vitellaria paradoxa</i>: Composites’ Performances and Applications

Cited by 4 publications

References 45 publications

In Vitro Antioxidant Activity, Bioaccessibility, and Thermal Stability of Encapsulated Strawberry Fruit (Fragaria × ananassa) Polyphenols

In Vitro Antioxidant Activity, Bioaccessibility, and Thermal Stability of Encapsulated Strawberry Fruit (Fragaria × ananassa) Polyphenols

Extraction, Quantification, and Ftir Characterization of Bark Tannins of Four Forest Species Grown in Northeast Brazil

Tannins from cashew tree (Anacardium occidentale) bark as a flocculant for water clarification

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