RESUMO
The study evaluated the bioactive components and antioxidant properties of sugarcane phenolic extracts (SCPE) against lipid oxidation in raw ground pork and beef during refrigerated storage conditions. Results showed that SCPE has a high total phenolic content of 35.9 g GAE/100 g sample majority of which are vanillic (799.77 mg/100 g), sinapic (434.38 mg/100 g), and coumaric (342.37 mg/100 g) acids. These phenolic compounds exhibited strong radical scavenging activities against DPPH (191.00 mg TE/g) and ABTS (359.80 mg TE/g) radical, ferric reducing capacity (97.80 mg TE/g), and lipid peroxidation inhibition (120.20 mg TE/g) activities which are comparable to BHT. Supplementation of SCPE at 400 mg/kg fresh weight of ground pork and ground beef improved the antioxidant activities of meat samples, leading to the delay in TBARS formation, lower reduction in heme iron content, and minimal increase in metmyoglobin content during 14-day refrigerated storage as compared to BHT-treated and control. Moreover, the redness of meat was preserved in SCPE- and BHT-treated samples as measured by a* color value. Correlation heat maps showed that TBARS, metmyoglobin, and ΔE are positively correlated with each other, and at the same time showed negatively correlated with heme iron and a*. This study revealed that antioxidant extracts from sugarcane presented a positive effect on the oxidative stability of raw ground pork and beef during refrigerated storage.
RESUMO
Pili (Canarium ovatum Engl.), an indigenous tree found in the Philippines, is highly regarded for its fruit due to its high economic value. During processing, the pulp is often discarded as waste but contains considerable amounts of oil and bioactive minor lipid components. The present study explored the antioxidant and antibacterial properties of saponified diethyl ether extract of pili pulp oil and related this activity to the nature of compounds present in the extract through GCMS. The extract indicated the elution of 18 major compounds which are mostly cyclic triterpenic (α-and ß-amyrin, lupenone, and ß-amyrone) and phytosterol (ß-sitosterol, brassicasterol, and stigmasterol) class of compounds. Characterization of the bioactivity of the extract showed high antioxidant activities measured by DPPH radical scavenging (EC50: 74.45 ± 1.29 µg/mL) and lipid peroxidation inhibition (EC50: 3.02 ± 0.06 µg/mL) activities that were comparable with that of α-tocopherol. Moreover, an observed bactericidal activity was demonstrated by the extract against E. coli and S. typhi with MIC values of 40 and 35 µg/mL, respectively. The observed bioactivity of the pili pulp oil extract can be attributed to these compounds which may provide desirable health benefits.