Plant Uptake of Xenobiotics

Collins, Chris; Martín, I. Sáiz; Doucette, William J.

doi:10.1007/978-90-481-9852-8_1

Cited by 35 publications

(31 citation statements)

References 63 publications

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“…Translocation of organic compounds within plants generally decreases with increasing hydrophobicity (Trapp and Legind, 2011). Also, roots have higher lipid content than most other plant tissues, and neutral compounds have been shown to be preferentially distributed in tissues with high lipid content (Collins et al, 2011). In addition, the rapid conversion of 14 C residue to the non-extractable form, as discussed above, may be another important factor for the negligible transfer from roots to other plant tissues.…”

Section: Resultsmentioning

confidence: 99%

Uptake and accumulation of four PPCP/EDCs in two leafy vegetables

Dodgen

Parker

et al. 2013

Environmental Pollution

179

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Many pharmaceutical and personal care products (PPCPs) and endocrine-disrupting chemicals (EDCs) are present in reclaimed water, leading to concerns of human health risks from the consumption of food crops irrigated with reclaimed water. This study evaluated the potential for plant uptake and accumulation of four commonly occurring PPCP/EDCs, i.e., bisphenol A (BPA), diclofenac sodium (DCL), naproxen (NPX), and 4-nonylphenol (NP), by lettuce (Lactuca sativa) and collards (Brassica oleracea) in hydroponic culture, using 14C-labeled compounds. In both plant species, plant accumulation followed the order of BPA > NP > DCL > NPX and accumulation in roots was much greater than in leaves and stems. Concentrations of 14C-PPCP/EDCs in plant tissues ranged from 0.22±0.03 to 927± 213 ng/g, but nearly all 14C-residue was non-extractable. PPCP/EDCs, particularly BPA and NP, were also extensively transformed in the nutrient solution. Dietary uptake of these PPCP/EDCs by humans was predicted to be negligible.

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Section: Resultsmentioning

confidence: 99%

Uptake and accumulation of four PPCP/EDCs in two leafy vegetables

Dodgen

Parker

et al. 2013

Environmental Pollution

179

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“…Biodistribution Emerging contaminants Reclaimed water Recent research investigating the uptake of contaminants of emerging concern into plants from reclaimed irrigation water [27][28][29] has revealed conflicting ideas on how best to describe and predict how these emergent chemicals will enter and be distributed within a particular plant [16,18,21,23,24,[29][30][31][32][33][34][35][36][37][38][39]. Traditional models of organic contaminant uptake in plants suggested that compounds that were too hydrophobic would not undergo significant passive transport in the transpiration stream [21,40].…”

Section: Abstract: Bioaccumulationmentioning

confidence: 99%

Accumulation of contaminants of emerging concern in food crops—part 2: Plant distribution

Hyland

Blaine

Higgins

2015

Enviro Toxic and Chemistry

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Arid agricultural regions often turn to using treated wastewater (reclaimed water) to irrigate food crops. Concerns arise, however, when considering the potential for persistent contaminants of emerging concern to accumulate into plants intended for human consumption. The present study examined the accumulation of a suite of 9 contaminants of emerging concern into 2 representative food crops, lettuce and strawberry, following uptake via the roots and subsequent distribution to other plant tissues. Calculating accumulation metrics (concentration factors) allowed for comparison of the compartmental affinity of each chemical for each plant tissue compartment. The root concentration factor was found to exhibit a positive linear correlation with the pH-adjusted octanol-water partition coefficient (DOW ) for the target contaminants of emerging concern. Coupled with the concentration-dependent accumulation observed in the roots, this result implies that accumulation of these contaminants of emerging concern into plant roots is driven by passive partitioning. Of the contaminants of emerging concern examined, nonionizable contaminants, such as triclocarban, carbamazepine, and organophosphate flame retardants displayed the greatest potential for translocation from the roots to above-ground plant compartments. In particular, the organophosphate flame retardants displayed increasing affinity for shoots and fruits with decreasing size/octanol-water partition coefficient (KOW ). Cationic diphenhydramine and anionic sulfamethoxazole, once transported to the shoots of the strawberry plant, demonstrated the greatest potential of the contaminants examined to be then carried to the edible fruit portion.

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“…The existence of conflicting models describing uptake of water soluble contaminants necessitates further examination of the preexisting assumptions and concepts [20][21][22][23]. For example, hydrophobic and neutral organic chemicals are known to accumulate in plant roots; some anionic pharmaceuticals have been shown to accumulate in alfalfa leaves from reclaimed irrigation water [24], and the behavior of some ionic and zwitterionic compounds was found to be governed by their hydrophobicity [12][13][14][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Accumulation of contaminants of emerging concern in food crops—part 1: Edible strawberries and lettuce grown in reclaimed water

Hyland

Blaine

Dickenson

et al. 2015

Enviro Toxic and Chemistry

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Contaminants of emerging concern present in domestic waste streams include a highly diverse group of potentially biologically active compounds that can be detected at trace levels in wastewater. Concerns about potential uptake into crops arise when reclaimed water is used in food crop production. The present study investigated how 9 contaminants of emerging concern in reclaimed water are taken up into edible portions of two food crops. Two flame retardant chemicals, tris(1-chloro-2-propyl) phosphate (TCPP) and tris(2-chloroethyl) phosphate (TCEP) and several polar pharmaceuticals (carbamazepine, diphenhydramine, sulfamethoxazole, and trimethoprim) accumulated in a linear, concentration-dependent manner in lettuce (Lactuca sativa) irrigated with reclaimed water, suggesting passive uptake of both neutral and ionizable chemical contaminants in lettuce. Furthermore, concentration-dependent accumulation of TCEP and TCPP from reclaimed water was also observed in strawberry fruits (Fragaria ananassa). Collectively, these data suggest that highly polar or charged contaminants can be taken up by crops from water bearing contaminants of emerging concern and can be accumulated in the edible portions. Using these data, however, estimates of human exposure to these contaminants from reclaimed water food crop accumulation suggest that exposure to the contaminants of emerging concern examined in the present study is likely substantially lower than current exposure guidelines.

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Plant Uptake of Xenobiotics

Cited by 35 publications

References 63 publications

Uptake and accumulation of four PPCP/EDCs in two leafy vegetables

Uptake and accumulation of four PPCP/EDCs in two leafy vegetables

Accumulation of contaminants of emerging concern in food crops—part 2: Plant distribution

Accumulation of contaminants of emerging concern in food crops—part 1: Edible strawberries and lettuce grown in reclaimed water

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