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A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity.

ABSTRACT: The lignocellulosic biorefinery industry can be an important contributor to achieving global carbon net zero goals. However, low valorization of the waste lignin severely limits the sustainability of biorefineries. Using a hydrothermal reaction, we have converted sulfuric acid lignin (SAL) into a water-soluble hydrothermal SAL (HSAL). Here, we show the improvement of HSAL on plant nutrient bioavailability and growth through its metal chelating capacity. We characterize HSAL's high ratio of phenolic hydroxyl groups to methoxy groups and its capacity to chelate metal ions. Application of HSAL significantly promotes root length and plant growth of both monocot and dicot plant species due to improving nutrient bioavailability. The HSAL-mediated increase in iron bioavailability is comparable to the well-known metal chelator ethylenediaminetetraacetic acid. Therefore, HSAL promises to be a sustainable nutrient chelator to provide an attractive avenue for sustainable utilization of the waste lignin from the biorefinery industry.

SUBMITTER: Liu Q

PROVIDER: S-EPMC10421960 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity.

Liu Qiang Q Kawai Tsubasa T Inukai Yoshiaki Y Aoki Dan D Feng Zhihang Z Xiao Yihui Y Fukushima Kazuhiko K Lin Xianyong X Shi Weiming W Busch Wolfgang W Matsushita Yasuyuki Y Li Baohai B

Nature communications 20230811 1

The lignocellulosic biorefinery industry can be an important contributor to achieving global carbon net zero goals. However, low valorization of the waste lignin severely limits the sustainability of biorefineries. Using a hydrothermal reaction, we have converted sulfuric acid lignin (SAL) into a water-soluble hydrothermal SAL (HSAL). Here, we show the improvement of HSAL on plant nutrient bioavailability and growth through its metal chelating capacity. We characterize HSAL's high ratio of pheno ...[more]

PMID: 37567879

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Project description:Metal-catalyzed lipid oxidation is a major factor in food waste, as it reduces shelf life. Addressing this issue, our study investigates the potential of hydrolysates derived from potato protein, a by-product of potato starch production, as metal chelating antioxidants. Through sequential en-zymatic hydrolysis using Alcalase or Trypsin combined with Flavourzyme, we produced various hydrolysates, which were then fractionated via ultrafiltration. Using a combination of peptidomics and bioinformatics, we predicted the presence of metal-chelating and free radical scavenging pep-tides across all hydrolysate fractions, with a trend indicating a higher content of antioxidant pep-tides in lower molecular weight fractions. To validate these predictions, we utilized Surface Plas-mon Resonance (SPR) and a 9-day emulsion storage experiment. While SPR demonstrated poten-tial in identifying antioxidant activity, it faced challenges in differentiating between hydrolysate fractions due to significant standard errors. In the storage experiment, all hydrolysates showed li-pid oxidation inhibition, though not as effectively as EDTA. Remarkably, one fraction (AF13) was not significantly different (p < 0.05) from EDTA in suppressing hexanal formation. These results highlight SPR and peptidomics/bioinformatics as promising yet limited methods for antioxidant screening. Importantly, this study reveals the potential of potato protein hydrolysates as antioxi-dants in food products, warranting further research. The aim of this study was to evaluate the potential of SPR as a screening technique for potato protein hydrolysates (PPH) as metal chelating antioxidants. More specifically, the goal was to correlate the KD of the hydrolysates, determined by SPR, with development of different oxidation markers obtained during a storage experiment where the PPHs were added as antioxidants to 5 % fish oil-in-water emulsions at pH 7. Additionally, the effect of using different combinations of enzymes on antioxidant activity of the hydrolysates was investigated and peptidomics was applied to characterize the composition of the hydroly-sates. With the aim of achieving shorter peptides through a high degree of hydrolysis (DH%), this study utilized sequential hydrolysis, where Trypsin (Try) or Alcalase (Alc) was paired with Flavourzyme (Fla). Owing to its broad specificity as a heterogeneous combination of various endo- and exopeptidases [20], Flavourzyme is known to facilitate high DH% and the production of short peptides [21]. However, it has been reported that when used solely with a denatured substrate protein of limited solubility, Flavourzyme can yield a significantly lower DH% than anticipated [19]. Consequently, this study was designed to include substrate pre-digestion prior to Flavourzyme addition.

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A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity.

Publications

A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity.

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