Fresh Neem Leaves (Azadirachta indica A. Juss) Extraction and
Application: An Optimization using Response Surface Methodology

Rahayuningsih, Edia; Subagya, I.S.; Setiawan, Felix Arie; Petrus, Himawan Tri Bayu Murti

doi:10.14233/ajchem.2019.22207

Cited by 7 publications

(7 citation statements)

References 24 publications

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“…RSM provides a means to explain the effect of each parameter studied on the retention percentage. Indeed, this method has been used in many previous research studies (Rahayuningsih et al 2018(Rahayuningsih et al , 2019(Rahayuningsih et al , 2020. The validation was also conducted using specified independent variables to generate the response at 80°C and 100°C.…”

Section: Discussionmentioning

confidence: 99%

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Microencapsulation of betacyanin from red dragon fruit (Hylocereus polyrhizus) peels using pectin by simple coacervation to enhance stability

et al. 2020

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Betacyanin is a red natural dye pigment widely used in food products. However, the pigment is also unstable and easily degraded by temperature during storage and food processing. This research aims to increase the stability of betacyanin obtained from dragon fruit peels using pectin as a wall medium via the coacervation method. Due to the efficiency and shell integrity, the coacervation method was selected instead of spray drying to enhance betacyanin's stability. Coacervation was conducted in a three-necked round-bottomed flask fitted with a mercury-sealed stirrer and reflux condenser. An accelerated stability test was conducted at 80°C and 100°C for 30 min and considered completed after obtaining a stable absorbance. Two full factorials, three-level design, for 80°C and 100°C, were analyzed by Response Surface Methodology using MinitabÒ 19. The core/wall ratio, agitation speed, and pH were the continuous variables, with temperature as the categorical variables. The models were yielded high R-square and low coefficient of variance on the validation process. Simple coacervation is selected because of a superior method such as simplicity, low-cost, high efficiency, and high shell integrity.

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Section: Discussionmentioning

confidence: 99%

“…Degradation is one of the key issues encountered in the use of food colorants. As natural dyes' potential and drawback, some innovation is necessary to minimize natural dyes' disadvantages as food colorants (Rahayuningsih et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Microencapsulation of betacyanin from red dragon fruit (Hylocereus polyrhizus) peels using pectin by simple coacervation to enhance stability

et al. 2020

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“…The filtrate samples were taken at 1, 10, 30, 60, and 120 min. Acid leaching is carried out at three temperature variations (30,60, and 90 °C) and three HCl concentration variations (1, 5, and 9 M). The composition of the filtrate is analyzed using inductive coupled plasma (ICP) Plasma Quant 9000 Elite.…”

Section: Methodsmentioning

confidence: 99%

Low-Grade Ilmenite Leaching Kinetics Using Hydrochloric Acid: RSM and SCM Approaches

Supriyatna,

Prasetya,

Astuti

et al. 2024

Indones. J. Chem.

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Minerals containing TiO2 are common in Indonesia, such as ilmenite in iron sand deposits scattered along the country's coasts. Ilmenite is an important source of titanium. One method for making TiO2 from ilmenite is by solubilizing both the Fe and Ti elements in HCl and then immediately hydrolyze the Ti. The leaching of low-grade ilmenite (ground to 0.177-0.149 mm) is studied kinetically by HCl in a stirred reactor. The research was conducted using the caustic fusion method followed by HCl leaching. The leaching reaction kinetics at the optimum conditions are analyzed using response surface methodology (RSM) with a second-order polynomial equation model and SSE with the shrinking core model (SCM). The results showed that HCl concentration and leaching time were directly proportional to the leached titanium concentration. In contrast, the leaching temperature was inversely proportional. The optimum operating conditions were obtained at a temperature of 30 °C, 9 M HCl, and 120 min of leaching time. The shrinking core model is a better representation of the kinetics than RSM with a second-order polynomial equation model. Based on SCM, the rate of the leaching reaction of titanium from low-grade ilmenite is controlled by diffusion through the ash layer.

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“…Ecofriendly natural dyes with minimal impacts on the environment have gained increased research attention. Natural dyes present the advantages of high renewability, biodegradability, and nontoxicity (Rahayuningsih et al, 2019). Indigo is a popular natural dye that can be extracted from various plants, such as Indigofera tinctoria, Indigofera arecta, Strobilanthes flaccidifollus, Isatis tinctoria, and other indigoid plants.…”

Section: Introductionmentioning

confidence: 99%

Photofading of Natural Indigo Dye in Cotton Coated with Zinc Oxide Nanoparticles Synthesized by Precipitation Method

Reningtyas¹,

Rahayuningsih²,

Kusumastuti³

et al. 2022

IJTech

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Blue dye (indigo) from Indigofera tinctoria leaves is a popular natural dye used worldwide. The lower light fastness of natural indigo dyes compared to that of synthetic blue dyes is one of the drawbacks of the former, limiting its utilization in the textile industry. In this study, zinc oxide nanoparticles (ZnONPs) were synthesized and characterized, and their effect on the photofading of cotton fabric dyed with natural indigo was investigated. ZnO was produced by simple precipitation. Fourier transform infrared spectroscopy (FTIR), X-ray powder diffractometry (XRD), and Brunauer-Emmett-Teller analysis were employed to characterize the composition, shape, crystallinity, size, and surface area of the resulting NPs. The optical characteristics and bandgap energy of the ZnONPs were also determined using a UV-Vis spectrophotometer. XRD and scanning electron microscopy (SEM) confirmed the synthesis of ZnONPs. The ZnONPs were applied to cotton fabrics via the dip-coating method. The transmittance of cotton coated with ZnONPs was lower than that of the uncoated sample. Photofading tests with UV-A irradiation were conducted, and the fading rate of natural indigo dye in cotton showed first-order kinetics. Overall, the synthesized ZnONPs provided excellent UV protection to reduce the photofading of cotton dyed with natural indigo.

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Fresh Neem Leaves (Azadirachta indica A. Juss) Extraction and Application: An Optimization using Response Surface Methodology

Cited by 7 publications

References 24 publications

Microencapsulation of betacyanin from red dragon fruit (Hylocereus polyrhizus) peels using pectin by simple coacervation to enhance stability

Microencapsulation of betacyanin from red dragon fruit (Hylocereus polyrhizus) peels using pectin by simple coacervation to enhance stability

Low-Grade Ilmenite Leaching Kinetics Using Hydrochloric Acid: RSM and SCM Approaches

Photofading of Natural Indigo Dye in Cotton Coated with Zinc Oxide Nanoparticles Synthesized by Precipitation Method

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