Amino acid contents and toxically relevant arsenic of rice varieties consumed in Portugal

Andreia Rego; Carla Mota; Sandra Gueifão; Marta Ventura; Inês Delgado; Joel Lopes; Ana Matos; Isabel Castanheira

doi:10.1016/j.measurement.2017.03.025

Amino acid contents and toxically relevant arsenic of rice varieties consumed in Portugal

Andreia Rego, Carla Mota, Sandra Gueifão, Marta Ventura, Inês Delgado, Joel Lopes, Ana Matos, Isabel Castanheira

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

This study evaluated amino acids, antioxidant capacity, and arsenic species present in Indica and Japonica rice cultivars (Oryza sativa L.) grown in similar regions, as well as brown rice. Essential amino acids in brown rice exhibited a greater abundance when compared to white rice. Lysine was the only essential amino acid with higher concentration in white rice than in brown rice. Results showed antioxidant activity of 0.46 IC₅₀ (mg mL⁻¹) and TPC 0.11 mg eq. GA/g of sample. Total arsenic content in rice samples was about 200 µg/kg. HPLC-ICP-MS determinations revealed iAs as the predominant species in bran samples. Through Spearman's correlation, negative correlations between six amino acids and total arsenic content in japonica white rice were observed. Sulphur amino acid cysteine presented the highest negative correlation (ρ = −0.758, p-value = 0.011). Based on our results, a regular benefit-risk assessment for rice products to enhance the consumption choice is recommended.

Original language	English
Pages (from-to)	189-195
Number of pages	7
Journal	Measurement: Journal of the International Measurement Confederation
Volume	113
DOIs	https://doi.org/10.1016/j.measurement.2017.03.025
Publication status	Published - Jan 2018
Externally published	Yes

Keywords

Amino acids
Antioxidant capacity
Arsenic speciation
Rice

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10.1016/j.measurement.2017.03.025

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title = "Amino acid contents and toxically relevant arsenic of rice varieties consumed in Portugal",

abstract = "This study evaluated amino acids, antioxidant capacity, and arsenic species present in Indica and Japonica rice cultivars (Oryza sativa L.) grown in similar regions, as well as brown rice. Essential amino acids in brown rice exhibited a greater abundance when compared to white rice. Lysine was the only essential amino acid with higher concentration in white rice than in brown rice. Results showed antioxidant activity of 0.46 IC50 (mg mL−1) and TPC 0.11 mg eq. GA/g of sample. Total arsenic content in rice samples was about 200 µg/kg. HPLC-ICP-MS determinations revealed iAs as the predominant species in bran samples. Through Spearman's correlation, negative correlations between six amino acids and total arsenic content in japonica white rice were observed. Sulphur amino acid cysteine presented the highest negative correlation (ρ = −0.758, p-value = 0.011). Based on our results, a regular benefit-risk assessment for rice products to enhance the consumption choice is recommended.",

keywords = "Amino acids, Antioxidant capacity, Arsenic speciation, Rice",

author = "Andreia Rego and Carla Mota and Sandra Gueif{\~a}o and Marta Ventura and In{\^e}s Delgado and Joel Lopes and Ana Matos and Isabel Castanheira",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2018",

month = jan,

doi = "10.1016/j.measurement.2017.03.025",

language = "English",

volume = "113",

pages = "189--195",

journal = "Measurement: Journal of the International Measurement Confederation",

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TY - JOUR

T1 - Amino acid contents and toxically relevant arsenic of rice varieties consumed in Portugal

AU - Rego, Andreia

AU - Mota, Carla

AU - Gueifão, Sandra

AU - Ventura, Marta

AU - Delgado, Inês

AU - Lopes, Joel

AU - Matos, Ana

AU - Castanheira, Isabel

PY - 2018/1

Y1 - 2018/1

N2 - This study evaluated amino acids, antioxidant capacity, and arsenic species present in Indica and Japonica rice cultivars (Oryza sativa L.) grown in similar regions, as well as brown rice. Essential amino acids in brown rice exhibited a greater abundance when compared to white rice. Lysine was the only essential amino acid with higher concentration in white rice than in brown rice. Results showed antioxidant activity of 0.46 IC50 (mg mL−1) and TPC 0.11 mg eq. GA/g of sample. Total arsenic content in rice samples was about 200 µg/kg. HPLC-ICP-MS determinations revealed iAs as the predominant species in bran samples. Through Spearman's correlation, negative correlations between six amino acids and total arsenic content in japonica white rice were observed. Sulphur amino acid cysteine presented the highest negative correlation (ρ = −0.758, p-value = 0.011). Based on our results, a regular benefit-risk assessment for rice products to enhance the consumption choice is recommended.

AB - This study evaluated amino acids, antioxidant capacity, and arsenic species present in Indica and Japonica rice cultivars (Oryza sativa L.) grown in similar regions, as well as brown rice. Essential amino acids in brown rice exhibited a greater abundance when compared to white rice. Lysine was the only essential amino acid with higher concentration in white rice than in brown rice. Results showed antioxidant activity of 0.46 IC50 (mg mL−1) and TPC 0.11 mg eq. GA/g of sample. Total arsenic content in rice samples was about 200 µg/kg. HPLC-ICP-MS determinations revealed iAs as the predominant species in bran samples. Through Spearman's correlation, negative correlations between six amino acids and total arsenic content in japonica white rice were observed. Sulphur amino acid cysteine presented the highest negative correlation (ρ = −0.758, p-value = 0.011). Based on our results, a regular benefit-risk assessment for rice products to enhance the consumption choice is recommended.

KW - Amino acids

KW - Antioxidant capacity

KW - Arsenic speciation

KW - Rice

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EP - 195

JO - Measurement: Journal of the International Measurement Confederation

JF - Measurement: Journal of the International Measurement Confederation

ER -

Amino acid contents and toxically relevant arsenic of rice varieties consumed in Portugal

Abstract

Keywords

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