TY - JOUR
T1 - Optimizing the extraction of phenolic antioxidants from peanut skins using response surface methodology
AU - Ballard, Tameshia S.
AU - Mallikarjunan, Parameswarakumar
AU - Zhou, Kequan
AU - O'keefe, Sean F.
PY - 2009/4/22
Y1 - 2009/4/22
N2 - Peanut skins are a byproduct of peanut blanching operations and contain high levels of phenolic antioxidants. The effect of solvent type (methanol MeOH, ethanol EtOH, and water), concentration (0, 30, 60, 90%), temperature (30, 45, 60 °C), and time (10, 20, 30 min) on total phenolic content (TPC), oxygen radical absorbance capacity (ORAC) level, and resveratrol content of peanut skins was investigated. Response surface methodology was used to estimate the optimum extraction conditions for each solvent. EtOH extracts had the highest TPC followed by MeOH and water. The maximum predicted TPC under the optimized conditions (30.8%, 30.9 °C, 12 min) was 118 mg of gallic acid equivalents (GAE)/g of skins. MeOH extracts had the highest ORAC activity of 2149 μmol of TE/g followed by EtOH and water under the optimized conditions of 30% MeOH, 52.9 °C and 30 min. Resveratrol was identified in MeOH extracts but was not found in samples extracted with EtOH or water.
AB - Peanut skins are a byproduct of peanut blanching operations and contain high levels of phenolic antioxidants. The effect of solvent type (methanol MeOH, ethanol EtOH, and water), concentration (0, 30, 60, 90%), temperature (30, 45, 60 °C), and time (10, 20, 30 min) on total phenolic content (TPC), oxygen radical absorbance capacity (ORAC) level, and resveratrol content of peanut skins was investigated. Response surface methodology was used to estimate the optimum extraction conditions for each solvent. EtOH extracts had the highest TPC followed by MeOH and water. The maximum predicted TPC under the optimized conditions (30.8%, 30.9 °C, 12 min) was 118 mg of gallic acid equivalents (GAE)/g of skins. MeOH extracts had the highest ORAC activity of 2149 μmol of TE/g followed by EtOH and water under the optimized conditions of 30% MeOH, 52.9 °C and 30 min. Resveratrol was identified in MeOH extracts but was not found in samples extracted with EtOH or water.
KW - Antioxidants
KW - Extraction
KW - ORAC
KW - Peanut skins
KW - Polyphenols
KW - Response surface methodology
KW - Resveratrol
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U2 - 10.1021/jf8030925
DO - 10.1021/jf8030925
M3 - Article
C2 - 19284759
AN - SCOPUS:65349154614
SN - 0021-8561
VL - 57
SP - 3064
EP - 3072
JO - Journal of agricultural and food chemistry
JF - Journal of agricultural and food chemistry
IS - 8
ER -