Physicochemical property,thermal characteristics and antioxidant activity of Macaranga adenantha Gagnep.seed oil
Aiming to provide a reference for further development and utilization of Macaranga adenantha Gagnep.seed oil,the oil was extracted from Macaranga adenantha Gagnep.seed with shell and without shell by Soxhlet extraction.The physicochemical properties,total polyphenol content,fatty acid composition,thermal characteristics and antioxidant activities of Macaranga adenantha Gagnep.seed oil with shell(HMGO)and without shell(NMGO)were determined.A comparative analysis between HMGO and NMGO was conducted to investigate their respective properties.The results showed that the oil content in Macaranga adenantha Gagnep.seed with shell was slightly lower than that without shell.The acid value,peroxide value,total polyphenols and unsaponified contents of NMGO were lower than those of HMGO,whereas the saponification value was higher for NMGO.A total of 21 and 20 fatty acids were detected from HMGO and NMGO,respectively,in which nervonic acid was the dominant fatty acid in both,with a content of 43.00％in NMGO and 41.10％in HMGO,followed by erucic acid with 30.20％in NMGO and 28.80％in HMGO.The melting peak temperatures of HMGO and NMGO low-temperature crystallisation were-4.19 ℃ and-3.68 ℃,respectively.Both oils had a rapid pyrolysis temperature range between 355-441 ℃(HMGO)and 363-440 ℃(NMGO),respectively.The maximum mass loss of both oils occurred at 407 ℃.Macaranga adenantha Gagnep.seed oil had different scavenging effects on DPPH and ABTS free radicals,and the scavenging ability increased with the increase of concentration.Furthermore,HMGO exhibited superior scavenging ability on DPPH and ABTS free radicals in comparison with NMGO.In conclusion,Macaranga adenantha Gagnep.seed oil can be developed and utilized as a source of nervonic and erucic acid.
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