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3 protocols using 6 aminopenicillanic acid

1

Analytical HPLC Characterization of Compounds

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All standard compounds used (glucosamine, erythritol, arabitol and mannitol; purity ≥98%) as well as chemicals (acetic acid, ammonium acetate, 6-aminopenicillanic acid, etc.) and solvents (acetonitrile) were purchased from Sigma (St. Louis, MO, USA) or Merck (Darmstadt, Germany). HPLC-grade water for analysis was obtained from an Arium water purification system (Sartorius, Göttingen, Germany).
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2

Enzymatic Assays and Growth Studies

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For growth studies and enzymatic assays high purity penicillin G sodium salt (Sigma, P3032), (+)-6-aminopenicillanic acid (Sigma, A70909), phenylacetic acid (Sigma, W287806), and other antibiotics, were purchased. Dextro-(−)-benzylpenicilloic acid hydrate (Sigma, S341967) was purchased from the Sigma-Aldrich collection of rare and unique chemicals. p-Nitroacetanilide (Sigma, 130648), p-nitroaniline (Sigma, 185310), 6-nitro-3-(phenylacetamido)benzoic acid (aka NIPAB, Pfaltz and Bauer, N10625), N-phenylacetyl-p-aminobenzoate (Sigma, P8529), L-glutamate 1-(p-nitroaniline) (Sigma, 49622), L-glutamate γ-(p-nitroaniline) (Sigma, G1135) and Nα-benzoyl-DL-arginine p-nitroaniline (Sigma, B4875) were purchased as enzyme substrates and standards. For the kinetics assays p-nitrophenol (MP Biomedicals, 102461) and m-nitrophenol (Acros organics, 172300100) were purchased as indicators for monitoring of enzyme reaction kinetics in pH-shift assays. All other compounds and buffers used were of standard molecular biology grade.
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3

Enzymatic Assays and Growth Studies

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For growth studies and enzymatic assays high purity penicillin G sodium salt (Sigma, P3032), (+)-6-aminopenicillanic acid (Sigma, A70909), phenylacetic acid (Sigma, W287806), and other antibiotics, were purchased. Dextro-(−)-benzylpenicilloic acid hydrate (Sigma, S341967) was purchased from the Sigma-Aldrich collection of rare and unique chemicals. p-Nitroacetanilide (Sigma, 130648), p-nitroaniline (Sigma, 185310), 6-nitro-3-(phenylacetamido)benzoic acid (aka NIPAB, Pfaltz and Bauer, N10625), N-phenylacetyl-p-aminobenzoate (Sigma, P8529), L-glutamate 1-(p-nitroaniline) (Sigma, 49622), L-glutamate γ-(p-nitroaniline) (Sigma, G1135) and Nα-benzoyl-DL-arginine p-nitroaniline (Sigma, B4875) were purchased as enzyme substrates and standards. For the kinetics assays p-nitrophenol (MP Biomedicals, 102461) and m-nitrophenol (Acros organics, 172300100) were purchased as indicators for monitoring of enzyme reaction kinetics in pH-shift assays. All other compounds and buffers used were of standard molecular biology grade.
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