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
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
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
UR - http://www.scopus.com/inward/record.url?scp=85016000464&partnerID=8YFLogxK
U2 - 10.1016/j.measurement.2017.03.025
DO - 10.1016/j.measurement.2017.03.025
M3 - Article
AN - SCOPUS:85016000464
SN - 0263-2241
VL - 113
SP - 189
EP - 195
JO - Measurement: Journal of the International Measurement Confederation
JF - Measurement: Journal of the International Measurement Confederation
ER -