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61 protocols using sodium hydroxide (naoh)

1

Stereospecific Lactide Synthesis

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l-Lactide and d-lactide
were produced from l-lactic acid (Purac, India) and d-lactic acid (Musashino, Japan), respectively, by a two-step polymerization
and depolymerization procedure. l-Lactic acid or d-lactic acid was dehydrated to obtain oligomeric PLLA or PDLA, which
was further depolymerized in the presence of tin oxide to obtain l-lactide or d-lactide, respectively, and used after
purification. Tin oxide (SnO) and stannous octoate (tin octoate) were
procured from Sigma-Aldrich. Catalyst solution was prepared by dissolving
1 g of tin octoate in 10 mL of toluene (Merck, India). high-performance
liquid chromatography (HPLC)-grade chloroform and hydrochloric acid
(HCl) were purchased from Merck, India. Sodium hydroxide (NaOH) was
obtained from HiMedia Laboratories, India. All of the chemicals were
used as received.
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2

Lignin-Modified Wood Composite Preparation

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The basic substrates i.e., tangential veneers of two species one under the low-density category (i.e., Ailanthus wood density—330–435 kg m−3) and the other a medium density timber (i.e., Rubberwood density—density 560–640 kg m−3) were collected from the plywood and matchwood industries of Kerala, India. The chemicals such as sodium hydroxide (NaOH) (SD fine-chemicals limited), disodium salt of ethylenediaminetetraacetic acid (EDTA) (HiMedia), magnesium sulfate (MgSO4) (Fischer scientific), and hydrogen peroxide (H2O2) (SD fine-chemicals limited) were used in the lignin modification of wood. A type of commercially available unsaturated polyester resin (UPR) named as ‘Roof Light’ (chiefly consisting of a combination of phthalic anhydride, maleic anhydride, propylene glycol, and methyl methacrylate crosslinked or diluted with styrene monomers in the ratio 60:40), methyl ethyl ketone peroxide (MEKP) initiator and cobalt octoate (Co. Oct.) accelerator were supplied by Annapurna agencies, Bangalore. Based on the repeated trial and error experiments, a formulation consisting of 0.5% Co. Oct. and 0.25% MEKP in 100 gm of resin was found to be ideal for TW preparation and processing.
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3

Synthesis of Gold Nanoparticles for Cell Culture

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PCL (average Mn 80 kDa), CHT (<200 mPa), formic acid and acetic acid were purchased from Sigma Aldrich, USA and were used as received, without further purification. Gold (III) chloride trihydrate (HAuCl4·3H2O) was purchased from SD fine chemicals, India. C3H10T1/2 cells were procured from National Centre for Cell Science (NCCS), India and FBS was purchased from Gibco, USA. BSA, sodium hydroxide (NaOH) and all other cell culture reagents were purchased from HiMedia, India, unless specified otherwise.
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4

Dioscorea abyssinica Tuber Analysis

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At its maturity age (7 months after planting), Dioscorea abyssinica fresh tubers were collected from Saula, Gamogofa Zone, Southern Ethiopia. Sodium metabisulphite 99.5% (Sigma Chemicals Ltd., St. Louis, USA), propionic anhydride 98% (Sigma Aldrich, Germany), hydrochloric acid 37% (Guangzhou Jinhaunda Chemical Reagent Co. Ltd, China), NaOH 99.9% (HiMedia, Mumbai, India), and isopropanol 99% (Sigma-Aldrich, Germany) were used as received. Other chemicals, namely, pyridine99.8%, methanol 98%, ethanol 96.5%, KOH 99.9%, and phenolphthalein indicator 1% were obtained from Fine Chemicals Limited, Mumbai, India and were used as received.
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5

Ciprofloxacin-Chitosan Nanoparticle Formulation

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Ciprofloxacin was obtained from Himedia, Mumbai, (India), chitosan, sodium triphosphate pentabasic (TPP), fluorescein isothiocyanate (FITC) dye, and phorbol myristate acetate (PMA). Glacial acetic acid; NaOH; dimethyl sulphoxide(DMSO); trehalose; phosphate buffer saline (PBS); syringe filter (0.22 μ pore size);and RPMI culture media were obtained from Himedia, Mumbai (India).
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6

Preparation of P. aeruginosa culture media

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C4-HSL (N-Butyryl-DL-homoserine lactone, ≥96.0%) and 3-Oxo-C12-HSL [N-(3-oxododecanoyl)-homoserine lactone, ≥96.0%] were obtained from Sigma Aldrich, USA. The stock solutions of 1 M were prepared in dimethyl sulfoxide (DMSO, Sigma Aldrich).
The bacterial strain P. aeruginosa (MCC 3101) was maintained as a glycerol stock at −80°C. The AUM was prepared by adding the components (Supplementary Table S1) in the sterile distilled water and filter sterilized (Brooks and Keevil, 1997 (link)). The pH of the media was adjusted using 1 M NaOH (HiMedia Laboratories, USA) and concentrated hydrochloric acid solution (SRL, India).
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7

Catalase-Mediated Hydrogen Peroxide Decomposition

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Hydrogen peroxide was used as a substrate and obtained from Fisher Scientific, Bovine liver catalase (15,200 U/mg), Glutaraldehyde, Acetic acid, Chitosan, Bentonite, NaOH were obtained from HIMEDIA.
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8

Formulation of CEL film III

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CEL form III was provided as a gift sample by Jubilant Generics Ltd. (Noida, Uttar Pradesh, India). PVP-VA 64, manufactured by BASF (Germany) and HPMCAS-MF grade, manufactured by Shin Estu (Japan) was generously provided by Signet Chemical Corporation Pvt. Ltd. (Mumbai, India). NaOH and KOH were procured from Himedia Laboratories Pvt. Ltd. (Mumbai, India). All other chemicals used in the experiments were of analytical grade and used as such.
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9

Comprehensive Reagents and Cell Lines

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Unless otherwise mentioned all chemicals used are of the highest quality available and purchased from Sigma Aldrich (St. Louis, MO, USA). agarose, agar, ethidium bromide, catalase, methanol, ethanol, isopropanol, DMSO, NaCl, EDTA, Tris-HCl, Triton-X 100, NaOH, paraformaldehyde, bovien serum albumin (BSA), biotin, histidine, ampicillin, oxoid nutrient broth No. 2, and protease inhibitor cocktail were obtained from HiMedia (Mumbai, India), sodium fluoride and orthovandate from MP Biomedicals, LLC (Solon Ohio, USA), CellROX Deep Red and Nuc Blue (Hoechst 33342) from ThermoFisher Scientific (Santa Clara, CA), Salmonella typhimurium TA100 from Microbial Type Culture Collection and Gene Bank (MTCC, Chandigarh, India), thalidomide and DMEDA from Tokyo Chemical Industry (Tokyo, Japan), nitrocellulose membranes from MDI Membrane Technologies (Ambala. India), LMPA and LE agarose from Lonza (Rockland, ME, USA), γ-H2AX Alexa Fluor 488 from Biolegend (San Diego, CA, USA), and PAD-PARP antibody from Abcam (MA, USA). The 293T cell line was purchased from National Centre for Cell Culture (Pune, India) and authenticated by Short Tandem Repeat DNA profiling from Life Code Technology, Delhi, India. HepG2 cells were a generous gift from Dr. Soumya Sinha Roy at the CSIR Institute of Genomics and Integrative Biology, New Delhi. HUVEC was procured from HiMedia (Mumbai, India).
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10

Natural Antimicrobial Polymer Formulations

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Sodium alginate with a medium viscosity and high mannuronic acid without inulin were purchased from Hi-media (Mumbai). They were prepared in distilled water and autoclaved at 121 °C for 15 min. The low-molecular-weight chitosan (deacetylated chitin, Hi-Media, Laboratories Mumbai), was prepared in distilled water and pure hydrochloric acid (Loba Chemie, Pvt Ltd.—Mumbai, India). Xanthan gum, gum acacia, and carrageenan were purchased from Loba Chemie, Pvt Ltd.—Mumbai, India. Starch, sodium caseinate, pepsin, trypsin, calcium chloride, sodium chloride, sodium bicarbonate, trisodium citrate, sodium hydroxide, potassium chloride, phosphate buffer saline (pH 7.2), and hydrochloric acid were purchased from Hi-media Laboratories (Mumbai, India). Glacial acetic acid with molar mass of 60.05 g mol−1 was bought from Merck (Darmstadt, Germany). Pancreatin, peptone, and bile salt were obtained from Loba Chemie, Pvt Ltd. (Mumbai, India). The De Man Rogosa and Sharpes (MRS) broth and MRS agar used in this work were purchased from Hi-media Laboratories (Mumbai). Indicator microorganisms used for the antimicrobial activity; i.e., Escherichia coli (MTCC No-432), Staphylococcus aureus (MTCC No-96), and Bacillus cereus (MTCC No-430), were procured from the Institute of Microbial Technology (IMTECH; Chandigarh, India).
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