The same propolis sample that was analyzed by GC-MS in 1997 and 2012 was examined again after being frozen for 15 years. No qualitative changes were seen in its composition; artepilin C, prenyl-p-coumaric acid, dihydrocinnamic acid, caffeic acid were the major compounds.
BurdockGA. (1998) Review of the biological properties and toxicity of bee propolis (propolis). Food and Chemical Toxicology, 36, 347–363.
2.
BankovaV, de CastroSL, MarcucciMC. (2000) Propolis: recent advances in chemistry and plant origin. Apidologie, 31, 3–15.
3.
BankovaV, PopovaM, TrushevaB. (2006) Plant sources of propolis: an update from a chemist's point of view. Natural Product Communications, 1, 1023–1028.
4.
SforcinJM, BankovaV. (2011) Propolis: is there a potential for the development of new drugs?Journal of Ethnopharmacology, 133, 253–260.
5.
TeixeiraEW, MessageD, NegriG, SalatinoA, StringhetaPC. (2010) Seasonal variation, chemical composition and antioxidant activity of Brazilian propolis samples. Evidence-Based Complementary and Alternative Medicine, 7, 307–315.
6.
BankovaV. (2005) Chemical diversity of propolis and the problem of standardization. Journal of Ethnopharmacology, 100, 114–117.
7.
BankovaV, Boudourova-KrastevaG, PopovS, SforcinJM, FunariSRC. (1998) Seasonal variations in essential oil form Brazilian propolis. Journal of Essential Oil Research, 10, 693–696.
8.
BankovaVS, Boudourova-KrastevaG, SforcinJM, FreteX, KujumgievA, Maimoni-RodellaR, PopovS. (1999) Phytochemical evidence for the plant origin of Brazilian propolis from São Paulo state. Zeitschrift für Naturforschung, 54, 401–405.
9.
Boudourova-KrastevaG, BankovaV, SforcinJM, NikolovaN, PopovS. (1997) Phenolics from Brazilian propolis. Zeitschrift für Naturforschung, 52c, 676–679.
10.
BankovaV, Boudourova-KrastevaG, PopovS, SforcinJM, FunariSRC. (1998) Seasonal variations of chemical composition of Brazilian propolis. Apidologie, 29, 261–267.
