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4 protocols using vacutainer blood collection tubes

1

Cytogenetic Analysis of CHT Exposure

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The IUPAC name of CHT is: Tetrachloroisophthalonitrile (CAS no. 1897-45-6). The CHT (obtained from Labservices, Bologna, Italy) was first dissolved in dimethyl sulfoxide (DMSO) (CAS no. 67-68-5) at a final concentration of 0.6 mg/mL (stock solution) and was kept at 4 °C until prepared for the final exposure solutions in culture medium. Gibco RPMI 1640 cell culture media supplemented with L-glutamine, foetal calf serum, phytohemagglutinin (PHA), and antibiotics were purchased from Invitrogen-Life Technologies, Milan, Italy. Cytochalasin-B, colchicine and Mitomycin-C (MMC) were obtained from Sigma-Aldrich, Milan, Italy. Methanol, Acetic acid, Giemsa stain solution, and conventional microscope slides were purchased from Carlo Erba Reagenti, Milan, Italy. Potassium chloride (KCl) and Sörensen buffer were obtained from Merck S.p.A., Milan, Italy. Vacutainer blood collection tubes were from Terumo Europe, Rome, Italy. Distilled water was used throughout the experiments.
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2

Genotoxicity Assessment of Oxybenzone

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The IUPAC name of Oxybenzone (CAS n. 131-57-7) is 2-Hydroxy-4-methoxybenzophenone or BP-3.
The BP-3 was dissolved in dimethyl sulfoxide (DMSO, . Gibco RPMI 1640 cell culture media supplemented with L-glutamine, foetal calf serum, phytohemagglutinin (PHA), and antibiotics were purchased from Invitrogen-Life Technologies, Milan, Italy. Cytochalasin-B, Mitomycin-C (MMC), DMSO, BP-3 and Giemsa stain solution were obtained from Sigma-Aldrich, Milan, Italy. Methanol, Acetic acid, and conventional microscope slides were purchased from Carlo Erba Reagenti, Milan, Italy. Potassium chloride (KCl) and Sörensen buffer were obtained from Merck S.p.A., Milan, Italy. Vacutainer blood collection tubes were from Terumo Europe, Rome, Italy.
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3

Bisphenol A Cytogenetic Assay Protocol

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The IUPAC name of bisphenol A (BP-A, CAS n. 80-05-7) is 4,4 0 -(propane-2,2-diyl)diphenol. The BP-A was dissolved in dimethyl sulfoxide (DMSO, CAS no. 67-68-5). Gibco RPMI 1640 cell culture media supplemented with L-glutamine, foetal calf serum (FCS), phytohaemagglutinin (PHA) and antibiotics were purchased from Invitrogen-Life Technologies, Milan, Italy. Cytochalasin-B, mitomycin-C (MMC), BP-A and Giemsa stain solution were obtained from Sigma-Aldrich, Milan, Italy. Methanol, acetic acid and conventional microscope slides were purchased from Carlo Erba Reagenti, Milan, Italy. Potassium chloride (KCl) and So ¨rensen buffer were obtained from Merck S.p.A., Milan, Italy. Vacutainer blood collection tubes were from Terumo Europe, Rome, Italy.
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4

Oxybenzone Stability and Photodegradation

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The IUPAC name of Oxybenzone (CAS n. 131-57-7) is 2-Hydroxy-4-methoxybenzophenone or BP-3.
BP-3 and Giemsa stain solution were obtained from Sigma-Aldrich, Milan, Italy. Methanol, acetic acid, and conventional microscope slides were purchased from Carlo Erba Reagenti, Milan, Italy. Potassium chloride (KCl) and Sörensen buffer were obtained from Merck S.p.A., Milan, Italy. Vacutainer blood collection tubes were from Terumo Europe, Rome, Italy.
As for its stability and photodegradation, BP-3 was found to degrade only about 4% after 28 days in water and to remain persistent after 24 h of simulated sunlight irradiation [43 (link)].
The chemistry of the tap water used for L. stagnalis experiments was as follows: pH: 7.3; dry residue at 180 °C: 313 mg/L; calcium: 71 mg/L; magnesium: 13 mg/L; ammonium: <0.05 mg/L; chlorides: 17 mg/L; sulfates: 35 mg/L; potassium: 2 mg/L; sodium: <10 mg/L; arsenic: <1 mg/L; bicarbonates: 238 mg/L; free residual chlorine: 0.1 mg/L; fluorides: <0.1 mg/L; nitrates: 21 mg/L; nitrites: <0.05 mg/L, and manganese: <1 µg/L. The BP-3 was not found [44 ].
The artificial seawater used for the experiments on O. diadema was made in the laboratory starting from deionized water, to which the necessary quantity of salts was added to reach the final salinity of 35‰.
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