Source: FLORIDA INTERNATIONAL UNIVERSITY submitted to NRP
SUSTAINABLE LIGNIN-BASED PH-RESPONSIVE MATERIAL FOR SEED COATING APPLICATIONS
Sponsoring Institution
National Institute of Food and Agriculture
Project Status
COMPLETE
Funding Source
Reporting Frequency
Annual
Accession No.
1023740
Grant No.
2021-67022-33468
Cumulative Award Amt.
$198,960.00
Proposal No.
2019-06306
Multistate No.
(N/A)
Project Start Date
Nov 15, 2020
Project End Date
Nov 14, 2023
Grant Year
2021
Program Code
[A1531]- Biorefining and Biomanufacturing
Recipient Organization
FLORIDA INTERNATIONAL UNIVERSITY
(N/A)
MIAMI,FL 33199
Performing Department
(N/A)
Non Technical Summary
The seed project, to be conducted at Florida International University, a Hispanic Serving Institution, aims to develop a lignin-based, pH-responsive material that could be used in a seed coating/encapsulation system with advanced benefits to plant growth. Soils are treated to exhibit a slightly acidic pH, beneficial to many crops both at planting and as the plant develops. The project will explore a novel way to engineer lignin into a pH-responsive material, embedding bonds that break apart upon exposure to acidic pH. The material will be amenable to seed coating applications, contributing to lignin valorization. Replacement of plastic-based polymeric seed coatings with a biodegradable material will mitigate potential environmental threats posed by microplastics.
Animal Health Component
50%
Research Effort Categories
Basic
50%
Applied
50%
Developmental
0%
Classification

Knowledge Area (KA)Subject of Investigation (SOI)Field of Science (FOS)Percent
2045240202050%
2045240200050%
Goals / Objectives
Seed Project Goal: This seed project aims to develop a lignin-based, pH-responsive material that could be used as a seed coating/encapsulation system with advanced benefits to plant growth. This pH-responsive biomaterial will serve as polymer base for applications such as seed coating material.The strategy includes lignin engineering into two components: (i). Catechol functionalized lignin, named Catechol-Lignin, and (ii) Boronic acid-functionalized lignin named BA Lignin. The functional groups on the two components enable a pH-sensitive covalent attachment by ligation to form the pH-responsive lignin (called pH-lignin). The project objectives are listed below.Objective 1. Demonstrate lignin engineering to obtain Catechol-Lignin and BA lignin.Objective 2. Demonstrate coupling of Catechol Lignin and BA lignin (catechol-boronic acid ligation).Objective 3. Analyze pH-responsiveness of pH-responsive lignin product: pH-Lignin.Objective 4: Analyze data and prepare Standard Research proposal in response to NIFA AFRI Foundational and Applied Science Program.
Project Methods
EFFORTS:MethodsMaterials to be used in the project: Lignin--be obtained from the USDA Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA. (Dr. Ryan Stoklosa, letter of collaboration included);Chemical reagentswill be purchased from chemical vendors (Sigma Aldrich, Fisher, VWR).Task 1.Lignin engineering via demethylation, to obtain lignin A (catechol functionalized)Toward achieving many accessible catechol groups, synthetic modification of Kraft lignin will follow the chemistry reported by Sawamura et al. 2with potential further optimizations, given the variability in molecular structure of lignin. In a typical experiment, cycloalkyl iodide (ex. cyclohexane iodide) will be reacted with Kraft lignin to generate catechol groups. The product will be dried and characterized to validate the presence of catechol groups. Two assays, one quantitative, and one qualitative will be used.Qualitative assay.A qualitative assay using nitrous acid will involve mixing of suspended Catechol-Lignin in DMF by ultrasonication and treated successively with sodium nitrite (10% NaNO2 aqueous solution), urea aqueous solution, and acetic acid (10% CH3COOH aqueoussolution). Upon treatment with sodium hydroxide (2M aqueous solution), and three minutes stirring at ambient temperature the appearance of red color in the supernatant will indicate the presence of catechol groups.Quantitation assay. While there are no current quantitative methods to identify catechol groups, an increase in the total free phenolic-OH content upon demethylation reaction could be attributed to the increase in catechol groups, per cited literature. The Folin-Ciocalteu assay is the currently reported assay used for the determination of free phenolic groups in Kraft lignins and will be utilized in this project. The reagent, consisting of a mixture of phosphomolybdate and phosphotungstate, will be mixed with dioxane/water in predetermined amounts according to theassay protocol, and the mixture kept at ambient temperature for 15 min. The samples will be also dissolved in a dioxane/water to form a solution (90:10 v/v). Upon centrifugation (to remove precipitates), the freshly prepared sample solutions will be further mixed with the Folin-Ciocalteu reagent and upon 3 minutes mixing, will be further combined with a 7.5% Na2CO3 aqueous solution. The final mixture will be stirred at ambient temperature for 54 h, followed by supernatant collection and subjected to UV−vis measurement at 765 nm, the absorption corresponding to the complex of phenols with the Folin−Ciocalteu reagent.Task 2.Lignin engineering via functionalization with boronic acidIn a typical experiment, the thiols within the lignin will be activated with 2,2′-Dipyridyl disulfide (Aldrithiol), toward enabling the formation of a reactive disulfide bond. To avoid pH limitations when reacting lignin with Aldrithiol, the reactions will be conducted in tetrahydrofuran (THF). Mercaptophenylboronic acid will be activated by reacting it with Aldrithiol. The reaction completion could be monitored by quantifying the amount of byproduct (2-thiopyridine), a yellow product, with characteristic adsorption at 343 nm. Further, the Kraft lignin, which is rich in -SH groups will be further reacted with the activated 4-mercaptophenylboronic acid to give Lignin B, boronic acid derivatized lignin. The functionalization efficiency of BA Lignin (amount of boronic acid in the final product) will be quantified by monitoring the quantity of byproduct in reaction 2, proportional with the absorbance of the reaction solution at 343 nm.Task 3Synthesize pH-responsive lignin (pH-Lignin) through chemical condensationSynthesis of pH-Lignin will be conducted in slightly basic conditions, at pH>7. Based on the quantification of functional groups in the two components, catechol-Lignin and BA lignin, equivalent quantities of each will be suspended in water at pH 10 and reacted for 24 hours under stirring, in ambient conditions. The product will be collected and dried followed by characterization. MALDI-ToF analysis will be performed for evaluating the molecular weight of the resulting polymer.Task 4.Evaluate pH responsiveness of pH-LigninPellets of the drypH-Ligninwill be formed at different thicknesses for simulating a coating thickness (0.2-1 mm) in potential seed coating applications. The pH responsiveness will be measured by exposing the pellet at different pH values in Petri dishes, (pH from 5 to 6.5) for time intervals between 6 and 24 hours. Identical non-treated pellets will be evaluated for the number of catechol groups (Folin-Ciocalteu assay and nitrous assay). The results will be compared with catechol concentration in identical pellets that have been acid-treated: upon exposure to acidic pH for 24 hours, the pellet or remaining materials (might be dispersed in the acidic aqueous solution) will be collected, dried and evaluated for catechol groups density in the same manner as non- exposed pellets. All experiments will be done in triplicate.Task 5.Prepare grant proposal. We will interpret and organize the preliminary data and prepare a grant proposal for a standard grant to be submitted to USDA NIFA.EVALUATION:The timeline of task completion and milestones are shown below.Year 1 Objective 1: Demonstrate lignin engineering to obtain lignin A and lignin B Task 1 milestone: complete catechol derivatization Task 2 milestone: Complete boronic acid ligninYear 2 Objective 2: Demonstrate coupling of lignins A and B by chemical condensation (catechol-boronic acid) Task 3 milestone : Demonstrate at least one type of pH-lignin Objective 3: Analyze pH-responsiveness of AB lignins Task 4 milestone: demonstrated pH responsive ligninObjective 4: Analyze data and prepare Standard Research proposal in response to NIFA AFRI Foundational and Applied Science Program Task 5 milestone: Complete proposal preparation in collaboration with USDA ARSPotential Pitfalls Aggregation of lignin because of coupling could be envisioned as a potential occurrence and generating a large molecular weight. This aspect will be controlled by operating at diluted conditions and with significant stirring.Limitation of proposed procedures. Due to non-covalent hydrophobic interactions, some of the functional groups in both Catechol-Lignin and BA-Lignin might not be accessible for the coupling reaction facilitated by the groups present at the surface of the aggregate. Therefore, we will study the correlation between the targeted concentration of functional groups and the actual functionality that is accessible for coupling.Expected results. We will demonstrate the feasibility of fabricating the modified lignins and their successful coupling, as well as pH responsiveness in the pH interval 5.5-7. The project will generate preliminary data for a future standard grant request, to accomplish Stage 2 of the project, seed coating application.Plans to communicate results. The results of this project will be used in preparing a standard grant proposal. In addition, significant findings will be communicated through peer-reviewed publications and conference presentations.

Progress 11/15/20 to 11/14/23

Outputs
Target Audience:The project outcomes address a large number of stakeholders, including: - USDA NIFA and USDA Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA. (Dr. Ryan Stoklosa-collaborator) - Graduate and undergraduate students working on the project, especially with focus on engaging minority students and women in the project. - Division of Agricultural Chemistry and Division of Inorganic Chemistry, American Chemical Society - Conference participants at the ACS Southeastern Regional Meeting, San Juan, Puerto Rico, October 19-22, 2022 -American Chemical Society National Meeting, March 17-22, 2024 New Orleans, LA; 2 oral presentations (graduate student presenters) accepted in the division of Cellulose and Renewable Materials. - National Renewable Energy Laboratory (NREL) (https://www.nrel.gov/research/re-biomass.html) Changes/Problems: Nothing Reported What opportunities for training and professional development has the project provided?The project involved training ofgraduate students and undergraduate students. The students synthesized the lignin derivatives,cellulose-aldehyde, lignin nanospheres and developed the seed coating experiments. The PD has submitted and has received USDA NIFA approval for a budget revision request in Year 2 for purchasing of an HPLC with Size exclusion chromatography feature, to complete the characterization of the chemically modified lignin and cellulose products. Both graduaate and undergraduate students in PD and key personnel groups received training on this important instrument. Two students will present at the ACS National meeting Spring 2024 (oral presentations accepted) and two publications were prepared (one submitted and one in preparation for submsission), thus providing opportunities for professional development in both oral and written scientific communication. How have the results been disseminated to communities of interest?A. Publications. Two publications were prepared (one submitted and one in preparation for submsission), thus providing opportunities for professional development in both oral and written scientific communication. 1. Fei Zhang, Ha Na, Jake Carrier, Chen-Yu Chang, Daniela Radu, and Cheng-Yu Lai "Lignin-Based Nanospheres as Environmental Remediation Platform for Anionic Dye Contaminants", Under revision, ACS Omega, Submitted December 8th, 2023; revision requested December 28th, 2023, revision to be submitted by February 1st, 2024. 2. Jake Carrier, Daniela Radu, Cheng-Yu Lai Lignin-Based Framework as a Potential Low-Cost Sorbent for the Direct Air Capture of CO2, To be submitted by February 15th, 2024 B. Conference presentations. Two oral presentations accepted forACS National Meeting Spring 2024 to be presented by students; 1.PAPER ID: 3988193, Fei Zhang (Ph.D. Student) PAPER TITLE: "Synthesis, characterization of polyethylenimine lignin and its adsorption of dye sulforhodamine B sodium salt from aqueous solution" 2.PAPER ID: 3985021, Jake Carrier (Ph.D. Student) PAPER TITLE: "Harnessing lignin's potential: Steps towards a sustainable sorbent for carbon capture" What do you plan to do during the next reporting period to accomplish the goals? Nothing Reported

Impacts
What was accomplished under these goals? This seed project aimed to develop a lignin-based, pH-responsive material that could be used as a seed coating/encapsulation system with advanced benefits to plant growth. This pH-responsive biomaterial is envisioned to serve polymer base for applications such as seed coating material. Lignin was modified with amine groups and coupled with cellulose dialdehyde, which also leads to a pH sensitive linkage engaging another renewable biomass derived material, cellulose. This slight detour was meant to demonstrate the feasibility of the concept. We successfully demonstrated that the linkage was accomplished and that the application of the two components (lignin-amine and cellulose-dialdehyde) on corn seeds via spray-coating of the components in solution, led to seeds with a uniform coupled materials, in a uniform coating. The planting of coated seeds demonstrated biocompatibility of the lignin-cellulose hybrid material and just-in-time germination. The data processing is ongoing and a manuscript in preparation for publication. Synthesis of lignin derivatives resulted in a side product which surprisingly rendered lignin nanospheres, a product that could be further utilized in agricultural and environmental applications. A proof-of-concept was already demonstrated and a publication submitted and is currently under final revision. The data collection is ongoing toward a new proposal preparation.

Publications

  • Type: Journal Articles Status: Under Review Year Published: 2024 Citation: Fei Zhang, Ha Na, Jake Carrier, Chen-Yu Chang, Daniela Radu, and Cheng-Yu Lai Lignin-Based Nanospheres as Environmental Remediation Platform for Anionic Dye Contaminants, Under revision, ACS Omega, Submitted December 8th, 2023; revision requested December 28th, 2023, revision to be submitted by January 15th, 2024.
  • Type: Journal Articles Status: Other Year Published: 2024 Citation: Jake Carrier, Daniela Radu, Cheng-Yu Lai Lignin-Based Framework as a Potential Low-Cost Sorbent for the Direct Air Capture of CO2, To be submitted by February 15th, 2024


Progress 11/15/21 to 11/14/22

Outputs
Target Audience:The project outcomes address a large number of stakeholders, including: - USDA NIFA and USDA Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA. (Dr. Ryan Stoklosa-collaborator) - Graduate and undergraduate students working on the project, especially with focus on engaging minority students and women in the project. - Division of Agricultural Chemistry and Division of Inorganic Chemistry, American Chemical Society - Conference participants at theACS Southeastern Regional Meeting, San Juan, Puerto Rico, October 19-22,2022 - National Renewable Energy Laboratory (NRE) (https://www.nrel.gov/research/re-biomass.html) Changes/Problems:Testing of the new materials as explained in the Accomplishmentssection will require an additional project year. The PD requested and has been approved a No-cost extension year for the project. This change is already reflected in the REEPORT portal and therefore a regular progress report (this report) was prepared in lieu of the final report. What opportunities for training and professional development has the project provided?-The project involved training of two graduate students who synthesized and characterized the lignin amine, and an undergraduatestudent who designed and useda seed germination testbed. One of the graduate students has been funded by the project and the other is a recipient of the University Veteran Graduate Fellowship which covers his stipend and tuition. -As a result of the extensive reserach training and gained experience, theundergraduate student was recruited by Boston Scientific as a Co-op intern for Fall 2022-Spring 2023. -The equipment, HPLC with size exclusion chromatography (SEC)feature, was succesfullyinstalled in PD's lab in November 2021 to complete the characterization of the chemically modified lignin products. Both graduate and undergraduate students in PD and key personnel groups received training on this important instrument. How have the results been disseminated to communities of interest? ACS Southeastern Regional Meeting, San Juan, Puerto Rico, October 19th, 2022,Presentation by PDCheng-Yu Lai FIU Undergraduate Research Symposium, Poster presentation, Undergraduate Student What do you plan to do during the next reporting period to accomplish the goals?The project team plans to accomplish the following: Validatethenew process for synthesis ofaminated lignin products and completetheircomprehensivecharacterization. Evaluate concentration of amine via the new in-house fluorescence assisted method. Publish at least one journal article with graduate and undergraduate student participation and present results at least at onenational conference in the field. Interpret and organize the preliminary data and prepare a grant proposal for a standard grant to be submitted to USDANIFA, in addition to the two proposals planned to be resubmitted.

Impacts
What was accomplished under these goals? This seed project aims to develop a lignin-based, pH-responsive material that could be used as a seed coating/encapsulationsystem with advanced benefits to plant growth. This pH-responsive biomaterial will serve as polymer base for applicationssuch as seed coating material. The strategy includes lignin engineering into two components: (i). Catechol functionalized lignin, named Catechol-Lignin, and(ii) Boronic acid-functionalized lignin named BA Lignin. The functional groups on the two components enable a pH-sensitivecovalent attachment by ligation to form the pH-responsive lignin (called pH-lignin). This linkage is pH-labile at a pH 5 whichcorresponds to seed germination. In the previous reporting period, personnel shortages due to COVID-19 pandemic as well as limited facilitiesaccess during this time, led to slight modifications of the following objectives: Objective 1. Demonstrate lignin engineering to obtain Catechol-Lignin and BA lignin. Objective 2. Demonstrate coupling of Catechol Lignin and BA lignin (catechol-boronic acid ligation). The modification allowed to demonstrate the proof-of-concept.In the new approach, the lignin was modified with amine groups and coupled with cellulose dialdehyde, which also leads to apH sensitive linkage engaging another renewable biomass derived material, cellulose. This detour was meant todemonstrate the feasibility of the concept. During this project period we attempted the Objective 1 again. However, the boronic acid functionalization to obtainBA lignin was not successful as the product mixture could not be purified and the NMR study did not reveal the functionalization. Therefore, the approach used in the previous project period, was deemed more feasible as this seed project aims to get the proof of concept,and we focused on developing afacile new process for synthesis ofaminated lignin products and on theirextensivecharacterization. The following were accomplished: Amination via a Manich reaction to embed functionality with varying number of amine groups to increase aminecontent was completed. Characterization of the products was conducted by Attenuated Total Reflection(ATR)Infrared spectroscopy. Concentration of the total amine content was accomplished by elemental analysis. To evaluate the concentration of the accessible amine group content, a ninhydrin test was adapted from published methodologies used for amine group detection, usingUV-Vis method as readout. However, the scattering due to lignin aggregation lead to inconclusive data. Therefore an in-house fluorescence assisted method is currently in testing. In addition, PD has submitted two proposals to USDA NIFA, listed below. Unfortunatelly, both were declined. However, the reviews were positive and PD plans to resubmit the proposals in the next cycle. Funding Opportunity: USDA NIFA Hispanic Serving Institutions Education Grants ProgramUSDA-NIFA-HSI-008701 Proposal Title:Experiential Learning of Elemental Analysis for Food, Water and Environmental Samples by Using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) Proposed Project Period 8/1/2022-7/31/2026 Funding Opportunity: USDA-NIFA Equipment Grants Program (EGP) Proposal Title:Micro X-Ray Fluorescence (m-XRF) for Bio-Renewable Materials and Environmental Applications Proposed Project Period 09/30/2022-09/29/2026

Publications


    Progress 11/15/20 to 11/14/21

    Outputs
    Target Audience:The project outcomes address a large number of stakeholders, including: - USDA Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA. (Dr. Ryan Stoklosa-collaborator) - Graduate and undergraduate students working on the project, especially with focus on engaging minority students and women in the project. - Conference participants: American Chemical Society (ACS) National Meeting with the theme: "Sustainability in a Changing World" August 21-25 Chicago, IL (hybrid in person/online format); abstract in preparation. - Division of Agricultural Chemistry, American Chemical Society - National Renewable Energy Laboratory (NRE) (https://www.nrel.gov/research/re-biomass.html) Changes/Problems: Nothing Reported What opportunities for training and professional development has the project provided?The project involved training of a graduate student who synthesized the lignin amine assisted by PD, and an undergraduate student who synthesized the cellulose-aldehyde and developed the seed coating experiment. The PD has submitted and has received USDA NIFA approval for a budget revision request for purchasing of an HPLC with Size exclusion chromatography feature, to complete the characterization of the chemically modified lignin and cellulose products. The equipment arrived in September 2021 and will be installed in PD's lab in November 2021. Both graduaate and undergraduate students in PD and key personnel groups will receive training on this important instrument. One student will present at the ACS National meeting Fall 2022 (in preparation). How have the results been disseminated to communities of interest?A manuscript is in preparation for publication in a peer reviewed journal and a conference presentation at ACS National Meeting 2022, Fall. What do you plan to do during the next reporting period to accomplish the goals?The project team plans to accomplish the following: a. Lignin engineering to obtain catechol functionalized lignin (cathecol-Lignin) and use the Folin-Ciocalteu assay to determine the free phenolic groups in Kraft lignins. b. Lignin engineering via functionalization with boronic acid (BA lignin synthesis). c. Accomplish pH-responsive lignin (pH-Lignin) through chemical condensation of the two components, catechol-Lignin and BA lignin. d. Evaluate pH responsiveness of pH-Lignin. e. Publish at least one journal article with graduate and undergraduate student participation and present results at least at one national conference in the field. f. Interpret and organize the preliminary data and prepare a grant proposal for a standard grant to be submitted to USDA NIFA.

    Impacts
    What was accomplished under these goals? This seed project aims to develop a lignin-based, pH-responsive material that could be used as a seed coating/encapsulation system with advanced benefits to plant growth. This pH-responsive biomaterial will serve as polymer base for applications such as seed coating material. The strategy includes lignin engineering into two components: (i). Catechol functionalized lignin, named Catechol-Lignin, and (ii) Boronic acid-functionalized lignin named BA Lignin. The functional groups on the two components enable a pH-sensitive covalent attachment by ligation to form the pH-responsive lignin (called pH-lignin). This linkage is pH-labile at a pH 5 which corresponds to seed germination. However, personnel shortages due to COVID-19 pandemic as well as limited facilities access during this time, led to slight modifications of the following objectives, Objective 1. Demonstrate lignin engineering to obtain Catechol-Lignin and BA lignin. Objective 2. Demonstrate coupling of Catechol Lignin and BA lignin (catechol-boronic acid ligation). modification which still allowed to demonstrate the proof-of-concept. In the new approach, the lignin was modified with amine groups and coupled with cellulose dialdehyde, which also leads to a pH sensitive linkage engaging another renewable biomass derived material, cellulose. This slight detour was meant to demonstrate the feasibility of the concept. One graduate student (on TA Program) was leveraged to complete this part of the project. We successfully demonstrated that the linkage was accomplished and that the application of the two components (lignin-amine and cellulose-dialdehyde) on corn seeds via spray-coating of the components in solution, led to seeds with a uniform coupled materials, in a uniform coating. The planting of coated seeds demonstrated biocompatibility of the lignin-cellulose hybrid material. A new student who will join the project in January 2022 will complete the original O1 and O2 above, while the results of the current work, involving lignin-amine and cellulose dialdehyde are in preparation for publication (manuscript in preparation).

    Publications