Modification of plant proteins by immobilized proteases

Lee, JW; Lopez, Anthony

doi:10.1080/10408398409527404

Cited by 8 publications

(11 citation statements)

References 242 publications

(225 reference statements)

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“…S C H E M E 1 Reported thiocracking of PET with geraniol in one step at 320 C to give SPG-320 (A) 14 or using a three-step process of glycolysis followed by esterification with oleoyl chloride then inverse vulcanization (B). 18 allowing for the use of HSMs as recyclable components in a panoply of applications. 15,26,49, In contrast to HSMs prepared by standard inverse vulcanization (usually ≤180 C), a high reaction temperature (320 C) was required to engage PET in the thermal degradation-transesterification-inverse vulcanization cascade route to SPG-320.…”

Section: (B)mentioning

confidence: 99%

Transesterification‐vulcanization route to durable composites from post‐consumer poly(ethylene terephthalate), terpenoids, and industrial waste sulfur

Derr,

Lopez,

Maladeniya

et al. 2023

Journal of Polymer Science

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Despite improvements in chemical recycling, most post‐consumer plastics are still deposited in landfills where they pose a significant threat to ecological health. Herein we report a two‐stage method for chemically recycling poly(ethylene terephthalate) (PET) using terpenoids and waste sulfur to yield composites. In this method, post‐consumer PET (from beverage bottles) undergoes transesterification with a terpenoid alcohol (citronellol or geraniol) to yield low‐molecular PET oligomers. The terpene‐derived alkenes in these PET oligomer derivatives then served as reaction sites for inverse vulcanization with 90 wt% elemental sulfur to form composite CPS (using citronellol) or GPS (using geraniol). Composition, mechanical, thermal, and morphological properties were characterized by NMR spectroscopy, MALDI, FT‐IR spectroscopy, compressive and flexural strength analysis, TGA, DSC, elemental analysis, and SEM/EDX. The composites CPS (compressive strength = 5.20 MPa, flexural strength = 3.10 MPa) and GPS (compressive strength = 5.8 MPa, flexural strength = 2.77 MPa) showed mechanical strengths comparable to those of commercial bricks (classification C62 for general building). The approach delineated herein thus represents a method to chemically recycle waste plastic with industrial waste sulfur and plant‐derived terpenoids to yield composites having favorable properties comparable to existing building materials.

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Section: (B)mentioning

confidence: 99%

Transesterification‐vulcanization route to durable composites from post‐consumer poly(ethylene terephthalate), terpenoids, and industrial waste sulfur

Derr,

Lopez,

Maladeniya

et al. 2023

Journal of Polymer Science

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“…59 The composite materials were allowed to stand at room temperature for 4 days prior to analysis. A sample of the same batch of GPET used in our previous report 60 was also used in the current study.…”

Section: Brown Grease (Supplied By the Animal Coproductsmentioning

confidence: 99%

“…Post-consumer PET bottles (M n = 44,000, M w = 82,000, PDI = 1.9) were processed and converted to GPET via glycolysis with diethylene glycol as previously reported. 60 GPET is a mixture comprising oligomers of 2-7 terephthalate units each and having ethylene glycol-or diethylene glycol-derived end groups. The next step in the process was the trans/esterification of GPET with brown grease.…”

Section: Depolymerization and Transesterificationmentioning

confidence: 99%

“…56,57 We recently reported additional uses of elemental sulfur in processes to recycle/upcycle waste plastic. [58][59][60] One of these applications involved the chemical recycling of poly(ethylene terephthalate) (PET) via sequential glycolysis, esterification with oleoyl chloride, and inverse vulcanization with elemental sulfur (Scheme 2). This process resulted in mPES, a HSM having compressive strength of 26.9 ± 0.6 MPa and flexural strength/moduli of 7.7/320 MPa.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, we report the transformation of postconsumer PET by glycolysis to give GPET 60 followed by trans/esterification with brown grease to give PGB, and finally reaction of 10-20 wt% PGB with elemental sulfur to yield composites GBS x (x = wt% S, varied from 80% to 90%). The chemical, thermal, and mechanical properties of these composites are detailed.…”

Section: Introductionmentioning

confidence: 99%

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Composites produced from waste plastic with agricultural and energy sector by‐products

Lopez,

Smith

2023

J of Applied Polymer Sci

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A three‐stage route to chemically upcycle post‐consumer poly(ethylene terephthalate) (PET) to produce high compressive strength composites is reported. This procedure involves initial glycolysis with diethylene glycol to produce a mixture (GPET) comprising oligomers of 2–7 terephthalate units followed by trans/esterification of GPET with fatty acid chains supplied by brown grease, an agricultural by‐product of animal fat of relatively low nutritional or fuel value. This process yields PGB comprising a mixture of mono‐terephthalate ester derivatives. The olefin units provided by unsaturated fatty acid chains in brown grease were crosslinked by an inverse vulcanization reaction with elemental sulfur to give composites GBSx (x = wt% S, varied from 80%–90%). The compressive strengths of GBS80 (27.5 ± 2.6 MPa) and GBS90 (19.2 ± 0.8 MPa) exceed the compressive strength required of ordinary Portland cement (17 MPa) for its use in residential building foundations. The current route represents a way to repurpose waste plastic, energy sector by‐product sulfur, and agricultural by‐product brown grease to give high strength composites with mechanical properties suggesting their possible use to replace less sustainably sourced legacy structural materials.

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Functional properties of safflower protein isolates: Water absorption, whipping and emulsifying characteristics

Paredes‐López¹,

Ordorica‐Falomir²

1986

J Sci Food Agric

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Safflower meal defatted at the laboratory (SML) and safflower cake provided by an industrial plant (SMI) were used for protein isolation. Isolates were obtained by micellisation (MP) and isoelectric precipitation (IP) techniques. The functional properties studied with these isolates were water and fat absorption, foam expansion and stability, and emulsion activity and stability. Within the experimental conditions of this research, it was observed that the various treatments received previously by the safflower meal, for oil extraction, seemed to have comparatively minor effects on the functional performance of the protein isolates. Only in the case of SML, did the MP isolates have a higher water and fat absorption, and foam expansion than IP samples. For both SML and SMI, the emulsion stability of MP was higher than that of IP.

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Modification of plant proteins by immobilized proteases

Cited by 8 publications

References 242 publications

Transesterification‐vulcanization route to durable composites from post‐consumer poly(ethylene terephthalate), terpenoids, and industrial waste sulfur

Transesterification‐vulcanization route to durable composites from post‐consumer poly(ethylene terephthalate), terpenoids, and industrial waste sulfur

Composites produced from waste plastic with agricultural and energy sector by‐products

Functional properties of safflower protein isolates: Water absorption, whipping and emulsifying characteristics

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