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Paclobutrazol enhances yield and secondary compound accumulation in Curcuma longa L.
(2024-11-01)
Montri, N.
;
Chauytam, S.
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Deewatthanawong, R.
;
Bunya-Atichart, K.
The results indicated that the application of different concentrations of PBZ at 60 days preharvest had an impact on yield after harvest at 9 months while the color of turmeric remained relatively consistent. In all treatments, the rhizome color was yellow to orange. The fresh weight of the rhizome showed no significant differences within the range of 0-800 mg/L PBZ treatments, with the lowest yield observed in 1,200 mg/L PBZ treatment. The dry weight percentage was highest when treated with 800 mg/L PBZ for the mother rhizome and 600 mg/L PBZ for the finger rhizome. Regarding the accumulation of secondary compounds, highly significant differences among the treatments were found for the content of total flavonoids and total phenolics while curcumin showed significant differences. The treatment with 1,200 mg/L PBZ had the highest total phenolics content at 78.18 mg GAE/gDW and total flavonoids at 295.54 mg QUE/gDW. PBZ-treated plants also showed higher curcumin content and percentage than the non-treated plants. These findings indicated that the application of PBZ has the potential to improve both the yield and quality of turmeric, which is advantageous for cultivating this valuable medicinal plant.
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Smartphone-based imaging colorimetric assay for monitoring the quality of curcumin in turmeric powder
(2024-07-01)
Jantra, Jongjit
;
Teepoo, Siriwan
;
Thananimit, Suchera
This research developed a colorimetric assay for semi-quantitative curcumin detection. The screening test was performed using a ferric chloride to form a brownish color which was further used to evaluate the amount of curcumin in the turmeric powder samples. The quantitative assay was performed based on the color intensity of the curcumin target using a smartphone digital image colorimetry with a developed lightbox constructed with a white light-emitting diodes (LED) light source as the measurement device. Images in red, green, and blue (RGB) color were processed to obtain relevant colors from the image and the color values were used to analyze curcumin concentrations. The intensity of the ΔB was correlated to the concentration of curcumin with high sensitivity. The method showed a linear range between 0.25 and 5 mg L−1 with the LOD and LOQ of 0.12 and 0.41 mg L−1, respectively. Sample analysis was carried out in turmeric powders. Curcumin in turmeric powder samples was simply extracted using acetonitrile followed by dilution 100 times for sample preparation. The accuracy was tested by spiking 0.25, 1.00, and 4.00 mg L−1 of standard curcumin into the turmeric sample solution. The average percentage recoveries were acceptable in all samples (90–104%). The method was validated by comparing the results obtained from the proposed method and high-performance liquid chromatography (HPLC). There was no statistically significant difference between the two methods (P = 0.05). Graphical Abstract: (Figure presented.).
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A rapid cotton swab for on-site screening of coloring curcumin on durian skin: food safety aspects
(2023-08-01)
Teerasong, Saowapak
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Boonyaratsewee, Phanaporn
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Aunruan, Panuwat
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Saard, Worawan
;
Saetear, Phoonthawee
Exported durians from Thailand are sometimes immersed in curcumin to give the fruits a good appearance. Curcumin is regarded as non-toxic additive, however some importing countries prohibited use of any additive to fresh fruits and vegetables. This work aims to develop a rapid, low cost and convenient cotton swab device for curcumin detection. The detection principle involves a colorimetric acid–base characteristic of curcumin. Curcumin in an acidic/neutral solution presents a bright yellow color, while it displays an intense orange–red color in basic solution. A cotton swab acted for both sample collection and as a sensing platform. A pre-moistened swab was used to wipe a durian surface. Afterward, a NaOH solution was dropped onto the swab. A distinct orange–red color appearing on the swab indicates the presence of curcumin. The cotton swab was applied for qualitative analysis of curcumin contaminated on durian husks via visual detection. The developed device provided good reliability, 93.75% (36 samples). Furthermore, the device was demonstrated for quantitative determination using camera detection. Two linear calibrations were obtained in ranges of 10–75 and 75–250 mg L−1, with a detection limit of 3.2 mg L−1. The method was also successfully applied to quantification of curcumin in durians (three samples) and dietary supplements (two samples). The test can be done in a few minutes. The developed device was established as an useful tool for food safety and control of contamination by curcumin in an on-site application. Graphical abstract: [Figure not available: see fulltext.]
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Curcumin-sensitized TiO2for enhanced photodegradation of dyes under visible light
(2014-01-01)
Buddee, Supat
;
Wongnawa, Sumpun
;
Sriprang, Pimpaporn
;
Sriwong, Chaval
Curcumin was coated on P25 TiO<inf>2</inf> by using impregnation method from freshly prepared curcumin solution. The resulting products (Cur-TiO <inf>2</inf>-P25) was studied by several techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier-transformed infrared spectroscopy, specific surface area by the Brunauer-Emmett-Teller method, and UV-Vis diffused reflectance spectroscopy. Experimental results revealed that impregnation of curcumin at 0.5, 3, 5, and 7 wt% did not affect the native phase of anatase and rutile in P25 significantly, however, it caused red shift of absorption onset in all curcumin-coated samples. The Cur-TiO<inf>2</inf>-P25 showed enhanced adsorption efficiency and increased photocatalytic activity under visible light with optimal result at 5 wt% curcumin content. Commercial anatase and rutile coated with curcumin (Cur-TiO<inf>2</inf>-an and Cur-TiO<inf>2</inf>-ru) were also prepared by the same method for the use in comparative studies of photodegradation of dyes. Cur-TiO<inf>2</inf>-an and Cur-TiO<inf>2</inf>-ru were also characterized with some selected equipment above but not as extensively as the Cur-TiO <inf>2</inf>-P25. Curcumin coating helped improve photocatalytic efficiencies of P25 and anatase but not for rutile. The mechanism of photocatalytic reaction was proposed that under visible light irradiation, curcumin molecule could act as dye sensitizing agent that injected electron into the conduction band of TiO<inf>2</inf> leading to photodegradation of dyes. © Springer Science+Business Media 2014.

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