Purification of triolein for use in semipermeable membrane devices (SPMDs)

Lebo, Jon A.; Almeida, F.; Cranor, Walter L.; Petty, Jimmie D.; Huckins, James N.; Rastall, Andrew; Alvarez, David A.; Mogensen, Bent; Johnson, B. Thomas

doi:10.1016/j.chemosphere.2003.09.014

Cited by 29 publications

(13 citation statements)

References 15 publications

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“…β-Carotene was used as such, while triolein was purified by washing cycles with pure MeOH and freezing/partial crystallization of the mixture at T < −20 °C, followed by a phase separation, until the measured absorbance of triolein was equal to that of the previous washing cycle (minimum four cycles). 24 Lutein and zeaxanthin were obtained through HPLC semipreparative isolation/purification of methanol extracts of maize flour. The mobile phase was methanol.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Extraction of Pigment Information from Near-UV Vis Absorption Spectra of Extra Virgin Olive Oils

Domenici

Ancora

Cifelli

et al. 2014

J. Agric. Food Chem.

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This work reports a new approach to extract the maximum chemical information from the absorption spectrum of extra virgin olive oils (EVOOs) in the 390-720 nm spectral range, where "oil pigments" dominate the light absorption. Four most important pigments, i.e., two carotenoids (lutein and β-carotene) and two chlorophylls (pheophytin-a and pheophytin-b), are chosen as reference oil pigments, being present in all the reported analytical data regarding pigments of EVOOs. The method allows the quantification of the concentration values of these four pigments directly from the deconvolution of the measured absorption spectrum of EVOOs. Advantages and limits of the method and the reliability of the pigment family quantification are discussed. The main point of this work is the description of a fast and simple method to extract of such information in less than a minute, through the mathematical analysis of the UV-vis spectrum of untreated samples of oil.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Extraction of Pigment Information from Near-UV Vis Absorption Spectra of Extra Virgin Olive Oils

Domenici

Ancora

Cifelli

et al. 2014

J. Agric. Food Chem.

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“…The SPMDs used in this project consisted of 97‐cm‐long (86 cm between the lipid‐containment seals) by 2.5‐cm‐wide layflat LDPE tubing containing 1.0 mL of purified triolein (Huckins et al, 2006; Lebo et al, 2004). The membrane surface area to total SPMD volume ratio of SPMDs used in this study was ≈86 cm 2 /mL, and triolein represented ≈20% of the mass of the SPMDs conforming to a “standard SPMD” as defined by Huckins et al (2006) Five SPMDs were placed in each deployment canister.…”

Section: Methodsmentioning

confidence: 99%

Chemical and Toxicologic Assessment of Organic Contaminants in Surface Water Using Passive Samplers

et al. 2008

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Passive sampling methodologies were used to conduct a chemical and toxicologic assessment of organic contaminants in the surface waters of three geographically distinct agricultural watersheds. A selection of current-use agrochemicals and persistent organic pollutants, including polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and organochlorine pesticides, were targeted using the polar organic chemical integrative sampler (POCIS) and the semipermeable membrane device passive samplers. In addition to the chemical analysis, the Microtox assay for acute toxicity and the yeast estrogen screen (YES) were conducted as potential assessment tools in combination with the passive samplers. During the spring of 2004, the passive samplers were deployed for 29 to 65 d at Leary Weber Ditch, IN; Morgan Creek, MD; and DR2 Drain, WA. Chemical analysis of the sampler extracts identified the agrochemicals predominantly used in those areas, including atrazine, simazine, acetochlor, and metolachlor. Other chemicals identified included deethylatrazine and deisopropylatrazine, trifluralin, fluoranthene, pyrene, cis- and trans-nonachlor, and pentachloroanisole. Screening using Microtox resulted in no acutely toxic samples. POCIS samples screened by the YES assay failed to elicit a positive estrogenic response.

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“…The SPMDs used in this project consisted of 97 cm long (86 cm between the lipid-containment seals) by 2.5 cm wide, lay-flat, low-density polyethylene tubing containing 1.0 ml of purified triolein [17]. The membrane surface area to total SPMD volume ratio of SPMDs used in the present study was approximately 86 cm 2 /ml, and triolein represented approximately 20% of the mass of the SPMDs, conforming to a standard SPMD as defined by Huckins et al [7].…”

Section: Passive Sampler Constructionmentioning

confidence: 99%

Reproductive health of bass in the Potomac, USA, drainage: Part 2. Seasonal occurrence of persistent and emerging organic contaminants

Alvarez

Cranor

Perkins

et al. 2009

Enviro Toxic and Chemistry

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The seasonal occurrence of organic contaminants, many of which are potential endocrine disruptors, entering the Potomac River, USA, watershed was investigated using a two-pronged approach during the fall of 2005 and spring of 2006. Passive samplers (semipermeable membrane device and polar organic chemical integrative sampler [POCIS]) were deployed in tandem at sites above and below wastewater treatment plant discharges within the watershed. Analysis of the samplers resulted in detection of 84 of 138 targeted chemicals. The agricultural pesticides atrazine and metolachlor had the greatest seasonal changes in water concentrations, with a 3.1- to 91-fold increase in the spring compared with the level in the previous fall. Coinciding with the elevated concentrations of atrazine in the spring were increasing concentrations of the atrazine degradation products desethylatrazine and desisopropylatrazine in the fall following spring and summer application of the parent compound. Other targeted chemicals (organochlorine pesticides, polycyclic aromatic hydrocarbons, and organic wastewater chemicals) did not indicate seasonal changes in occurrence or concentration; however, the overall concentrations and number of chemicals present were greater at the sites downstream of wastewater treatment plant discharges. Several fragrances and flame retardants were identified in these downstream sites, which are characteristic of wastewater effluent and human activities. The bioluminescent yeast estrogen screen in vitro assay of the POCIS extracts indicated the presence of chemicals that were capable of producing an estrogenic response at all sampling sites.

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Purification of triolein for use in semipermeable membrane devices (SPMDs)

Cited by 29 publications

References 15 publications

Extraction of Pigment Information from Near-UV Vis Absorption Spectra of Extra Virgin Olive Oils

Extraction of Pigment Information from Near-UV Vis Absorption Spectra of Extra Virgin Olive Oils

Chemical and Toxicologic Assessment of Organic Contaminants in Surface Water Using Passive Samplers

Reproductive health of bass in the Potomac, USA, drainage: Part 2. Seasonal occurrence of persistent and emerging organic contaminants

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