Laccases: catalytic and functional attributes for robust biocatalysis

Noreen, Sadia; Perveen, Sofia; Bilal, Muhammad; Iqbal, Hafiz M.N.

doi:10.1016/b978-0-12-824436-4.00018-6

Cited by 5 publications

(3 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All tested samples revealed ineffective against Gram-negative P. aeruginosa and E. coli, which was equally reported by El-Toumy et al with aqueous, methanolic, and ethyl acetate extracts of A. saligna leaves [24].The tested samples were also ineffective against C. albicans yeast, as observed by Silva et al with aqueous and methanolic extracts of A. dealbata leaves [30], by Ramli et al with ethanolic extract of A. farnesiana leaves [16], or by Cock and van Vuuren with aqueous and methanolic extracts of A. karroo leaves [17]. Antibacterial effects against Gram-negative E. coli bacteria [22,25,26,29,30] and C. albicans yeast [24,26,30,31] were detected in leaves extracts of Acacia spp., but, in some cases, using extract concentrations that were more than double [31] or even twenty times higher [26] than the ones used in this work. In general, a positive correlation was observed between the antimicrobial activity of extracts from leaves and twigs of A.dealbata, and their total phenolic content, but this association should be confirmed by additional quantitative studies.…”

Section: Antimicrobial Activitymentioning

confidence: 87%

“…has been focused mainly on the bark, flower, wood, and leaves as reviewed by Correia et al [15]. Concerning the leaves fraction, antioxidant or antimicrobial activities have been determined for A. farnesiana [16], A. karroo [17][18][19][20], A. longifolia [21], A. pycnantha [22,23], A. saligna [24][25][26][27], or A. nilotica [28]. The antioxidant and antimicrobial activities of A. dealbata leaves were evaluated by Borges et al [29], for acetonic and ethanolic extracts of fresh A. dealbata leaves, obtained with different extraction methods.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical and Functional Characterization of Extracts from Leaves and Twigs of Acacia dealbata

et al. 2022

View full text Add to dashboard Cite

The purpose of this work was to evaluate the recovery of bioactive extracts from Acacia dealbata leaves and twigs and to characterize their chemical composition and functional properties. Fresh and air-dried samples were extracted by maceration at room temperature and by hot extraction at 60 °C using aqueous solutions of acetone, ethanol, and methanol. The highest extraction yields (14.8 and 12.0% for dried leaves and twigs, respectively) were obtained with 70% acetone, for both extraction procedures. Extracts were characterized for total phenolics content (TPC), total flavonoid content (TFC) and total proanthocyanidin content (TPrAC). Bioactive extracts with high TPC (526.4 mg GAE/g extract), TFC (198.4 mg CatE/g extract), and TPrAC (631.3 mg PycE/g extract) were obtained using maceration, a technically simple and low-energy process. The non-polar fraction of selected extracts was characterized using gas chromatography and time of flight mass spectrometry (GC-TOFMS). The main components detected were phytol, squalene, a-tocopherol, lupenone, and lupeol. The antioxidant activity of the extracts was characterized through DPPH and FRAP assays. Antimicrobial activity of the extracts against different bacteria was also determined. The highest DPPH and FRAP activities were obtained from dried twigs from Alcobaça (1068.3 mg TE/g extract and 9194.6 mmol Fe2+/g extract, respectively). Extracts from both leaves and twigs showed antimicrobial properties against Staphylococcus aureus, Staphylococcus epidermidis, methicillin resistant Staphylococcus aureus (MRSA), Enterococcus faecalis, Bacillus cereus, Streptococcus mutans, and Streptococcus mitis. The results obtained demonstrate the feasibility of recovering valuable components from these biomass fractions that may be further valorized for energy production in a biorefinery concept.

show abstract

Section: Antimicrobial Activitymentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Chemical and Functional Characterization of Extracts from Leaves and Twigs of Acacia dealbata

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The polymer remains fixed on the material, avoiding the loss of color with time [74]. Laccases are metallo-enzymes with four copper atoms in the reaction center which transport the electron during the redox process [75]. The huge number of applications of Laccase (dyeing and finishing of wool, discoloration of wastewaters) leads to the optimization of preparation procedures for obtaining a mass production of this enzyme [76].…”

Section: Enzymes For Wool Processingmentioning

confidence: 99%

Eco-Friendly Processing of Wool and Sustainable Valorization of This Natural Bioresource

Popescu,

Stanescu

2024

Sustainability

View full text Add to dashboard Cite

The environmental invasion of plastic waste leads to, among other things, a reassessment of natural fibers. Environmental pollution has shown the importance of the degradability, among other properties, of the raw materials used by the textile industry or other industrial fields. Wool seems to be a better raw material than the polymers that generate large quantities of micro- and nano-plastics, polluting the soil, water, and air. However, the usual processing of raw wool involves a number of chemically very polluting treatments. Thus, sustainable procedures for making wool processing environmentally friendly have been considered, leading to the reappraisal of wool as a suitable raw material. Besides their applications for textile products (including smart textiles), new directions for the valorization of this natural material have been developed. According to the recent literature, wool may be successfully used as a thermal and phonic insulator, fertilizer, or component for industrial devices, or in medical applications, etc. In addition, the wool protein α-keratin may be extracted and used for new biomaterials with many practical applications in various fields. This review makes a survey of the recent data in the literature concerning wool production, processing, and applications, emphasizing the environmental aspects and pointing to solutions generating sustainable development.

show abstract

Biocatalytic Versatilities and Biotechnological Prospects of Laccase for a Sustainable Industry

et al. 2022

View full text Add to dashboard Cite

Laccases: catalytic and functional attributes for robust biocatalysis

Cited by 5 publications

References 105 publications

Chemical and Functional Characterization of Extracts from Leaves and Twigs of Acacia dealbata

Chemical and Functional Characterization of Extracts from Leaves and Twigs of Acacia dealbata

Eco-Friendly Processing of Wool and Sustainable Valorization of This Natural Bioresource

Biocatalytic Versatilities and Biotechnological Prospects of Laccase for a Sustainable Industry

Contact Info

Product

Resources

About