Nuts have been a popular leisure food as they are rich in antioxidants and other bioactive compounds. This research was designed to investigate the contents of bioactive compounds and antioxidant activities of walnut kernels, almonds, ginkgo seeds, peanuts, sunflower seeds, wild and cultivated Torreya grandis cv. Merrillii seeds (TGMS). The results indicated that different nut extracts varied significantly in contents of phenolics, flavonoids, and triterpenoids, as well as antioxidant activities (P<0.05). Extracts of sunflower seeds and walnut kernels possessed the highest total flavonoids content (35.16 mg QuE/g DM) and total phenolics content (9.69 mg GAE/g DM), respectively, followed by cultivated TGMS extracts. Meanwhile, cultivated TGMS extracts had the highest total triterpenoids content (4.37 mg OAE/g DM), followed by walnut extracts. Antioxidant assays revealed that cultivated TGMS extracts showed the strongest DPPH· and ABTS+· scavenging abilities, with the IC50 values of 0.08 mg E./mL and 0.07 mg E./mL, respectively. However, the best Fe3+ reducing ability was detected in walnut kernels extracts, and the quercetin equivalent reducing power was 115.25 mg QuE/g E., followed by cultivated TGMS extracts. Therefore, cultivated TGMS possessed considerable bioactive compounds and high antioxidant activities, which was a better antioxidant resource than almonds, ginkgo seeds, peanuts and sunflower seeds. This study may provide references for selecting nuts and evaluating their nutritional values.
WANG Hao
,
TU Zongcai
,
LUO Yalin
,
WANG Hui
,
YE Yunhua
,
ZHANG Lu
,
SHA Xiaomei
,
XIE Yawen
. Contents of polyphenols and triterpenoids in seven types of nuts and their antioxidant activities[J]. Food and Fermentation Industries, 2019
, 45(6)
: 219
-224
.
DOI: 10.13995/j.cnki.11-1802/ts.018274
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