Rambutan Fruit Peel Research Articles

A novel bio-mimetic approach for the fabrication of Bi2O3 nanoflakes from rambutan (Nephelium lappaceum L.) peel extract and their photocatalytic activity

This paper describes a highly efficient and robust solar photocatalytic treatment for the degradation of methyl orange dye over bio-synthesized Bi2O3 nanoflakes. Bio-mimetic way is adapted to synthesis Bi2O3 nanoflakes from the plant source of rambutan (Nephelium lappaceum L.) fruit peel extract. The bio-synthesized nanoflakes were characterized using X-ray diffraction studies, ultra-violet-visible diffuse reflectance spectra, field emission scanning electron microscope, high resolution transmittance electron microscope, energy dispersive X-ray spectroscopy, BET Surface area, ultra-violet-visible spectrophotometer and FT-IR spectroscopy. The photocatalytic activity of Bi2O3 nanoflakes were investigated using methyl orange dye under direct sunlight illumination in open atmosphere. The result shows that Bi2O3 nanoflakes were effectively degrading the dye to about 94.66% at 10h of exposure time. The decreases in chemical oxygen demand values from 88.8mg/l to 16.2mg/l, shows the mineralization of methyl orange dye along with color removal.

Pengaruh Variasi Ekstrak Metanol Kulit Buah Rambutan (Nephelium lappaceum L.) Terhadap Kestabilan Fisik Krim Antioksidan

ABSTRACT A research on influence methanol extracts concentration of fruit peel rambutan ( N. lappaceum L.), concerning physical stability of creams antioxidant had been done. This research aims to obtain an antioxidant cream formulation O/W type from rambutan fruit peel extracts and compares activity of the antioxidant cream with extract from fruit peel rambutan with using free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity. A total of 500 grams of fruit rambutan peel extracted with 80% methanol by maceration method and then extract obtained made antioxidant cream O/W type with the variation of the concentration of extract 1%, 2%, and 3% to the total weight of the cream. Evaluation of physical stability of creams includes organoleptic testing, creaming, viscosity testing and drop size of dispersed phase inversion before and after the storage conditions during the 12-hour accelerated alternately at 5°C and as many as 10 cycles of 35°C. Organoleptic observations show no change in color and odor on the third-cream formula. The research was used a completely randomized design and the data obtained were analyzed statistically distinguished by ansira on the confidence level. Statistical analysis shows that the concentration of rambutan fruit peel extracts give significant effect on the viscosity cream before and after accelerated storage conditions, while the size of the drops dispersed showed no significant effect. In this study, showed that no phase of inversion and creaming from all of cream. Formulation of skin creams with methanol extract of the fruit rambutan 1% cream can be categorized as the most stable, continuing antioxidant activity test showed that the cream with a concentration of extract 12,359 ppm, which inhibits 50% of free radicals.

Comparative Evaluation of Antimicrobial Properties of Red and Yellow Rambutan Fruit Peel Extracts

Background and Aims: Rambutan fruits are native to the humid tropical regions of the Peninsular Malaysia in Southeast Asia. Its antimicrobial properties are well known. There are two varieties of rambutan fruits available in Malaysian market i.e. red and yellow rambutan. Methodology: In the present study, a qualitative phytochemical analysis along with antibacterial properties of methanolic extract of both the varieties of rambutan peels were carried out by disc diffusion method against Streptococcus pyogenes, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Results: The methanolic extract of yellow rambutan peels showed more potency than red rambutan peels against Streptococcus pyogenes and Staphylococcus aureus ranged from 7-10mm and 5-12mm, respectively in different concentrations. At the same time both the extracts do not showed zone of inhibition against Escherichia coli and Pseudomonas aeruginosa. Conclusion: These results showed that methanolic extract of yellow rambutan peels are good candidate for further investigation against gram positive bacteria. Short Research Article Annual Research & Review in Biology, 4(24): 3869-3874, 2014 3870

Antioxidant activity and chemical constituents of some Indonesian fruit peels

The ethanolic extracts and their fractions of some Indonesian fruit peels were screened for their free radical scavenging properties using vitamin-E as standard antioxidant. Free radical scavenging activity was evaluated using 1, 1-diphenyl-2-picrylhydrazyl (DPPH) free radical. The strongest antioxidant activity was shown by the Rambutan (Nephelium lappaceum Linn.), followed by Kelengkeng (Euphoria longan Lour. Steud) and Durian (Durio zibethinus Murr.) with IC50 values of 7.74, 11.85, and 28.83 μg/mL, respectively comparable to vitamin-E (IC50 = 8.48 ± 0.1 μg/mL). The ethyl acetate fraction of these fruit peels extracts demonstrated the most active antioxidant activity compared with hexane, chloroform and methanol fractions. The chemical constituents of Rambutan and Durian were successfully isolated using vacuum liquid chromatography and radial chromatography technique, and these structures were characterizated based on the proton (1H) and carbon (13C) NMR spectra. The isolated compounds were ethyl gallate (1) from Rambutan (Nephelium lappaceum Linn.) rind, 4, 4-dimethylporiferasta-18(19)-en-3-ol (2) and 3α-E-ferulyloxy-lup-20(29)-en-28-oic acid (3) from Durian (Durio zibethinus Murr.) peels. The results showed that prospective antioxidant contents in Rambutan's fruit peel extract was higher than Kelengkeng and Durian fruit peel extracts.