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2 protocols using l lysine monohydrochloride

1

Insect Cell Culture Protocol

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TNM-FH insect medium and Fetal Bovine Serum (FBS) were purchased through Gemini Bio-products (Sacramento, CA). Hi Grace’s Insect Medium (Hi-GI) was purchased through Hi-Media (Mumbai, India). Citric acid was purchased through Fisher Scientific (Pittsburgh, PA), L-arginine hydrochloride through Calbiochem (San Diego, CA), L-lysine monohydrochloride through Acros-organics (Geel, Belgium), and methionine sulfoxide through Alfa Aesar (Haverhill, MA). All other reagents were obtained through Sigma-Aldrich (St. Louis, MO), unless specified. BM-7 and M15 media were prepared as described previously [8 (link), 10 (link)]. For M15 preparation, most components were dissolved with gentle stirring, except for L-tyrosine and three non-water soluble vitamins—biotin, folic acid and riboflavin. L-tyrosine was dissolved in 15 ml of 2 mM HCl prior to addition to M15. Biotin was dissolved in dimethyl sulfoxide, folic acid in 0.1 M NaOH, and riboflavin in 0.01 M NaOH. DL-serine of M15 was replaced by L-serine. Hi-Gi medium was prepared according to the manufacturer instructions. Briefly, 45.9 g of Hi-GI were dissolved in 950 mL of sterile, deionized water, slowly adjusting the pH to 5.92 by titration with 5 M KOH. After completing to 1 L, Hi-GI was sterilized through a 0.22 μm sterile filter. L. crescens strain BT-1 was used in all experiments.
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2

Aniseed Oil and Thymol Solubilization in Phosphate Buffer

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D-Glucose, L-Lysine monohydrochloride and linalool were purchased from Acros Organics, thymol from Applichem and anise oil from Sigma Aldrich (CAS: 8007-70-3, nature identical, synonym: aniseed oil). All solutions (glucose, lysine and the test compounds) were prepared in phosphate buffer 0.1 M, pH 7.2 ± 0.1 (PBS, Bectron, Dickinson and Company, Bergen County, NJ, USA) and Tween 80 (Serva Electrophoresis GmbH, Heidelberg, Germany) which helps to incorporate aniseed oil and thymol in phosphate buffer. As linalool possesses a very good aqueous solubility at pH 7.0, the use of Tween 80 was not necessary [26] (link).
2-Mercaptoethanol (MCE ≥ 99.0%), phthaldialdehyde (OPA ≥ 99.0%) and hydrochloric acid solution (0.1 N) were purchased from Sigma Aldrich (Steinheim, Germany). Sodium hydroxide (≥98%) and boric acid (≥99.5%) were purchased from Honeywell International Inc (Muskegon, MI, USA). Di-potassium hydrogen phosphate, potassium dihydrogen phosphate and sodium acetate trihydrate were purchased from MERCK (Darmstadt, Germany). Water, methanol and acetonitrile (HPLC grade) were purchased from Fisher Scientific (Loughborough, UK).
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