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35 protocols using acetonitrile

1

Protein Expression Protocol in E. coli

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NaCl, glycine, Tris, and HCl were analytical grade and purchased from Sinopharm Chemical Regent Co. LTD (Beijing, China). THF, NAD+, pyridoxal 5-phosphate monohydrate (PLP) were purchased from Sigma-Aldrich (Shanghai, China). Bicinchoninic acid (BCA) Protein Assay Kit was purchased from Beijing Solarbio Science & Technology Co. LTD (Beijing, China). Acetonitrile and trifluoroacetic acid (TFA) were chromatographic grade and purchased from J&K Scientific Ltd. (Beijing, China). Chemically competent cells of E. coli TOP10 and E. coli BL21(DE3) were purchased from Weidishengwu Ltd. (Beijing, China). In-fusion cloning was used for the ligation of sequence fragments to vector with the In-fusion HD Cloning Kit (Clontech Laboratories, Inc., US). Luria–Bertani (LB) liquid medium (tryptone 10 g/L, yeast extract 5 g/L and NaCl 10 g/L) and solid medium (1.5% agar) with kanamycin (100 μg/mL), ampicillin (100 μg/mL) were used for transformation, screening and cell growth.
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2

Quantitative Analysis of Astragalus Compounds

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Seeds of A. mongholicus were purchased from AnGuo Chinese Herbal Medicine Base in HeBei Province of China. Astragaloside IV, cycloastragenol, calycosin-7-O-β-d-glucoside, calycosin, ononin, formononetin, scutellarin (IS, internal standard) and sodium chloride were purchased from Chengdu Must Bio-technology Co., LTD. (Chengdu, China). Sodium chloride (NaCl) was of analytical reagent grade. Water used for the UPLC–MS/MS analysis was prepared with a Milli-Q water purification system procured from Millipore (Milford, MA, USA). Acetonitrile (J & K Scientific Ltd. Beijing, China) was of HPLC grade. All other chemicals used in the method were of analytical grade.
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3

HPLC Analysis of Dihydroquercetin Standards

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Dihydroquercetin (DHQ) standards (1257117-20607065, 98% purity) were purchased from the National Institute for the Control of Pharmaceutical and Biological Products (Beijing, China). Deionized water was purified using a Milli-Q Water Purification system (Millipore, Billerica, MA, USA). Acetonitrile and acetic acid of HPLC grade were purchased from J&K Chemical Ltd. (shanghai, China). The rest of the solvents and chemicals used in this study were of analytical grade and purchased from Beijing Chemical Reagents Co. (Beijing, China). All solutions prepared for HPLC were filtered through 0.45-µm membranes (GuangFu Chemical Reagents Co., Tianjin, China) before use.
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4

Optimized Avermectin B2 Formulations

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Avermectin B2 technical material (TC, 95%, w/w), EC (5%, w/w), emulsion in water (EW, 2.5%, w/w) and water dispersible granule (WDG, 3.5%, w/w) were provided by Hebei Xingbai Agricultural Technology Co., Ltd. (Hebei, China). Sodium benzoate, α-lactose, glucose and sucrose were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Styryl phenol polyoxyethylene ether (emulsifier 600) and alkylphenol formaldehyde resin polyoxyethylene ether (emulsifier 700) were provided by Cangzhou Hongyuan Agrochemical Co., Ltd. (Hebei, China). Ethyl acetate, chromatographic grade methanol and acetonitrile were bought from J&K Scientific Ltd. (Beijing, China). Parafilm was purchased from Sigma-Aldrich Shanghai Trading Co., Ltd. (Shanghai, China). All the chemicals were used as received. Milli-Q water (18.2 MΩ.cm, TOC ≤ 4 ppb) was used in all analytical experiments.
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5

Electrochemical Cellulose Film Fabrication

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Dopamine hydrochloride (98%), TEMPO (99%), ammonia aqueous solution (25 to 28 wt %), NaCl (99%), acetonitrile (99.9%), tetrabutylammonium hexafluorophosphate (Bu4NPF6) (99%), and ferrocene (99.5%) were all purchased from J&K Scientific Ltd. (Beijing, China). The cellulose film was obtained from Fushun city civil affairs filter paper factory. All chemicals were freshly used without further purification. Deionized water was used in all experiments.
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6

Synthesis of Bromooxoindole Derivatives

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6–Bromooxoindole–2–dione (98%), tetrahydrofuran (AR; THF), acetate (99.5%), 1–iodododecane (AR), and 6–bromoindoline–2,3–dione (98%) were purchased from Shanghai Vita Chemical. Hydrochloric acid (AR; HCl), 1–bromohexane (AR), acetonitrile (99%; ACN), tributyltin chloride (97%), 3–hexylthiophene (AR), and n–butyllithium solution (1.6 M in hexanes; n–BuLi) were obtained from J&K Scientific. Tetrakis (triphenyphosphine) palladium (99%; Pd(PPh3)4) and dichloromethane (99%; DCM) were acquired from Energy Chemical and Xilong Chemical, respectively. All other chemicals were of analytical grade and directly used as received.
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7

Monosaccharide Analysis of Lung Cancer Cells

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The monosaccharide standards (D-arabinose, L-rhamnose, D-mannose, D-ribose, D-glucose, D-xylose, D-galactose, D-glucuronic acid, and D-galactose acid), human lung cancer cell line A549, DEAE-52 cellulose, deuterium oxide (D2O), 1-phenyl-3-methyl-5-pyrazolone (PMP, M70800-100G) dimethyl sulfoxide (DMSO), dialysis bag (8–14 kDa), total antioxidant activity kit (T-AOC), 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azino-bis 3-Ethylbenzothia-zoline-6-sulfonic acid (ABTS), total antioxidant capacity kit (T-AOC), and Cell Counting Kit-8 (CCK-8) were provided by Solable Technology Co., Ltd. (Beijing, China). A series of dextran standards (5 k, 50 k, 150 k, 650 k, and 1100 k) were obtained from Aladdin Reagent Int. (Shanghai, China). High-performance liquid chromatography (HPLC) grades of methanol, acetonitrile, and formic acid were purchased from J&K Scientific Ltd. (Shanghai, China). The other chemicals of analytical grade were purchased from Beilian Chemical Co., Ltd. (Tianjin, China).
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8

Analysis of α-Dicarbonyl Compounds

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Glucose, disodium hydrogen phosphate, sodium dihydrogen phosphate, methanol, and ammonia (all of analytical grade) were purchased from Xilong Scientific Co., Ltd. (Guangdong, China). L-lysine (analytical grade) was purchased from Sinopharm Chemical Reagent Co., Ltd. (Beijing, China). Trifluoroacetic acid and acetonitrile (all of chromatographic grade) were purchased from J&K Scientific Ltd. (Beijing, China). Pyrraline (standard) was purchased from Beijing Pinellia Technology Development Co., Ltd. (Beijing, China). The analytical-grade standards of α-dicarbonyl compounds of 3-DG, GO, and MGO were purchased from Sigma-Aldrich (Zwijndrecht, The Netherlands).
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9

Aflatoxin B1 Quantification Protocol

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Rice husk was obtained from Cofco Engineering Technology Company (Wuxi, China) and stored at room temperature before treatment. Cooking oil was purchased at supermarkets. Ultrapure water (resistivity ≥18 MΩ/cm) was generated using a Millipore-Q SP system (Millipore, Bedford, MA, USA) and prefiltered through 0.22-μm filters. The AFB1 reference standard (2,3,6a,9a-tetrahydro-4-methoxycyclopenta[c]furo[2,3:4,5]furo[2,3-h]chromene-1,11-dione; C17H12O6; ≥98% purity) was purchased from Alexis Corporation (Lausen, Switzerland). HPLC-grade methanol, toluene, and acetonitrile were purchased from J&K Scientific (Zhejiang, China). All other analytical grade chemicals and reagents were obtained from Sinopharm Chemical Reagent Company (Beijing, China).
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10

Adsorption of Diphenhydramine on Natural Sands

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The natural sand samples SS and DS were collected from Shenzhen ocean beach and Tenggeli desert in China, respectively (Fig. S1). The diphenhydramine hydrochloride (DP) was obtained from Sinopharm Chemical Reagent Co., Ltd (Shanghai, China), with a purity >98%. Acetonitrile, acetic acid, triethylamine, isopropanol (IPA) and p-benzoquinone (BQ) were of high-performance liquid chromatography (HPLC) grade, and purchased from J&K Chemical Co., Ltd (Beijing, China). The spin trapping reagent 5,5-dimethyl-1-pyrroline N-oxide (DMPO) was obtained from Tokyo Chemical Industry Co., Ltd (Tokyo, Japan). All aqueous solutions were prepared with Milli-Q ultrapure water.
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