Introduction: Saurauia plant has been widely used to treat a variety of diseases suffered by villagers at various places in the world. These species are widely used traditionally by the community as antidiabetic and digestive problems' remedy. This paper will present various uses and researches ever carried out by researchers in the world on various types of the genus Saurauia. Methods: The Information was collected from scientific journals, books, and reports. Results: This review summarizes the existing information on several species of Saurauia in relation to their chemical compounds and biological activity. There are some of chemical compounds present and identified in Saurauia, i.e. 3β-hydroxy-Olean-12-en-28oic acid; 3,19-Dihydroxyurs-12-en-28-oic acid; 3-hidroksi, 12(13)-en, 28-oleanolat acid; actinidin; several monoterpene lactones; seven triterpenoids, namely, cis-3-O-p-hydroxycinnamoyl ursolic acid; trans-3-O-p-hydroxycinnamoyl ursolic acid; ursolic acid; oleanolic acid; corosolic acid; maslinic acid; and β-amyrin; and two steroids, stigmasterol; and β-sitosterol. There are several biological activities afforded by Saurauia i.e. antioxidant activity, anti-cholesterol, antidiabetic activity, antihyperlipidemic, analgetic activity, antimicrobial activity, wound-healing activity and immunostimulatory activity.
The bioactively rich soursop leaf extract can be encapsulated inside several natural coating materials. The extract of soursop leaf has been found to contain many bioactive compounds such as various phenolic compounds that are beneficial for anticancer, antidiabetic and many other health benefits. However due to the sensitive nature of the bioactive molecules, encapsulation procedure was applied to prolong the activity of the biomolecules. Capsule materials used in this experiment were obtained from natural extract of Okra mucilage, Aloe vera mucilage and Maltodextrin-WPI mixture to protect the unstable bioactive compounds. Homogenation time using ultrasonication and Core to Coating ratio was differed to observe the optimum encapsulation process. The encapsulation efficiency, release factor ability, size distribution and its correlation with bioactive stability are observed using Total Phenolic methods and Antioxidant Activity before and after encapsulation. Aloe vera gave best encapsulation efficiency (88-91%) while microcapsule made with Okra gave the best antioxidant activity (DPPH IC50 633-710ppm), and maltodextrin-WPI gave best powder recovery (yield 70-73%). Keywords: aloe mucilage, antioxidant activity, encapsulation, okra mucilage, soursop tea extract
Resveratrol derivatives have been reported to have important bioactivities. Synthesis of monomeric resveratrol derivatives has been a challenging topic in both organic and medicinal chemistry. A Synthesis of prenylated resveratrol was developed through prenylation between resveratrol (3,5,4'-trihydroxystilbene) and prenyl bromide (3,3-dimethyl allyl bromide) using heterogeneous superbase catalyst γ-Al2O3/NaOH/Na. The aim of this research is to obtain prenylated resveratrol compound that has important bioactivity and to identify a type of prenylation, O-or C-prenylation. Characterization of the product was carried out using liquid chromatography-mass spectrometry (LC-MS) and nuclear magnetic resonance ( 1 H-NMR). The antioxidant activity of the samples was determined using DPPH radical scavenging assay. The results of LC-MS analysis of the product showed the molecular ion peak at m/z 365.38 [M+H] + that indicated the presence of prenylated resveratrol with two prenyl (C5H9-) substituent. The 1 H-NMR spectrum of the product indicated that the addition of two prenyl substituent occurs at the hydroxyl group on the structure of resveratrol (O-prenylation). Prenylation caused decreasing free radical scavenging activity of the product (IC50 = 102,75 ppm) compared to resveratrol (IC50 = 63,52 ppm) and it means that the addition of prenyl substituents occurs through O-prenylation.
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