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3 protocols using urea

1

Moso Bamboo Powder Antioxidant Properties

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Moso bamboo powder was collected from Chengdu Shuxiang Co., Ltd. (Chengdu, China). Potato starch and 2,2-Diphenyl-1-picrylhydrazyl (DPPH) was purchased from Yuanye Biotechnology Co., Ltd. (Shanghai, China). The spectra/Por® 2 standard RC dry dialysis tube (8–14 kDa) was purchased from Spectrum Laboratories, Inc. (Compton, CA, USA). Choline chloride was purchased from Sigma-Aldrich. (Burlington, MA, USA) Urea, dimethyl sulfoxide (DMSO), HCl solution, KOH solution, and other reagents or solvents were purchased from Kelong Chemical Reagent Co., Ltd. (Chengdu, China).
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2

SPI-Based Composite Resin Synthesis

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SPI (91% protein, 2.5% fat, and 0.8% carbohydrate) was acquired from Linyi Shansong Biological Products Co., Ltd. (Shandong, China). Melamine (analytically pure), urea (analytically pure), formaldehyde solution (37 wt%), and other chemicals were acquired from Chengdu Kelong Chemical Co., Ltd. (Sichuan, China). Melamineurea–formaldehyde (MUF) resin with a molar ratio of 0.04 : 1 : 1.14 (Melamine/urea/formaldehyde) was synthesized by the laboratory. The 20 mm thick eucalyptus veneers were acquired from Xiangyi wood industry Co., Ltd. (Sichuan, China).
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3

Human Hair and Porcine Gastric Mucin Protocol

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Human hair was purchased from local barber shops in Chongqing, China. Porcine gastric mucin (PGM) was purchased from Sigma-Aldrich. (UK). N-ethylmaleimide (NEM) was purchased from Macklin Biochemical Co. Ltd. (Shanghai, China). Urea, Tween 20, Thioglycolic acid (TGA) and glacial acetic acid were purchased from Kelong Chemical Reagent Co. Ltd. (Chengdu, China). Amoxicillin sodium (AMO) was supplied by the Tuochukangyuan Pharm & Chem Co., Ltd. (Hubei, China). All other materials and reagents used in this study were analytical grade.
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