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Removal of Ni(II) Ions by Citric Acid-Functionalised Aloe vera Leaf Powder – Characterisation, Kinetics, and Isotherm Studies

Al-Amrani Waheeba Ahmed, Abdullah Rohaizan, Megat Hanafiah Megat Ahmad Kamal, Suah Faiz Bukhari Mohd

Journal of Ecological Engineering

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2023

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Vol. 24, nr 4

217--227

EN

Aloe vera leaves (AVL), a by-product of agricultural waste, have been applied as a biosorbent for reducing Ni(II) ions in aqueous solutions. The biosorption capability of AVL powder was enhanced through chemical treatment with 0.10 M citric acid solution. Fourier-transform infrared (FTIR) spectrophotometer, scanning electron microscope coupled with energy dispersive X-ray (SEM-EDX), pH of point-zero-charge (pHPZC), and pHslurry analyses were used to study the surface, and chemical properties of citric acid-treated Aloe vera leaf powder (CAAVLP). The setting for experiments such as pH solution, CAAVLP dose, initial concentration, and biosorption time was investigated. Maximum Ni(II) ion biosorption capability was determined to be 48.65 mg/g based on the Langmuir model at pH 6, a CAAVLP dose of 0.02 g, initial Ni(II) concentrations of 5 to 50 mg/L and biosorption time of 120 min. The data for the isotherm and kinetics were well matched with the Freundlich and pseudo-second-order models, respectively, with high regression correlation (R2) and low chi-square (χ2) values. The presence of more-COOH groups after treating AVL with citric acid resulted in more Ni(II) ions being able to be removed.

2

Effects of plant extracts and disinfectant Huva-San TR 50 on the quality of carrot (Daucus carota L.) seeds

Górski Romuald, Szopińska Dorota, Dorna Hanna, Rosińska Agnieszka, Stefańska Zuzanna, Lisiecka Jolanta

Ecological Chemistry and Engineering. S

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2020

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Vol. 27, nr 4

617--628

EN

The aim of the study was to determine the effect of Aloe vera (L.) Burm.f. (Aloe) and Morinda citrifolia L. (Indian mulberry) plant extracts and disinfectant Huva-San TR 50 (hydrogen peroxide stabilized with silver ions) on carrot seed quality. The seeds of two carrot cultivars Amsterdam (sample I) and Berlikumer 2 (sample II), were soaked in solutions of Aloe and Indian mulberry extracts and Huva-San TR 50 at concentrations of 0.025 %, 0.05 % and 0.1 % for 30 min. Untreated seeds and seeds soaked in distilled water for 30 min were used as controls. Seed germination was assessed after 7 and 14 days of incubation. The speed and uniformity of seed germination (vigour) were evaluated. Mycological analysis was performed using a deep-freeze blotter test. Sample I was characterized by lower germination at the first and the final counts than sample II and higher seed infestation with Alternaria radicina. Treating seeds of sample I with Morinda citrifolia plant extract at concentrations of 0.025 and 0.05 % reduced their infestation with Alternaria alternata and A. radicina, increased germination at the first and the final counts, and did not affect seed vigour. The effects of Aloe extract and disinfectant Huva-San TR 50 on seed quality parameters varied depending on their concentration. Hence, further studies are necessary to establish the optimal conditions for carrot seed treatment.

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Wiedza konsumentów o aloesie i produktach aloesowych

Kukułowicz A.

Przemysł Spożywczy

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2018

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T. 72, nr 5

38--42

PL

Aloe vera ma najwyższą spośród wszystkich gatunków aloesu aktywność biologiczną. Miazga i sok uzyskane z jego liści przetwarzane są na szeroką skalę na całym świecie. Respondenci, pomimo że deklarowali stosowanie produktów aloesowych, wykazali się skromną wiedzą o składnikach biologicznie aktywnych w nim zawartych. Największą wiedzę na temat acemannanu wzmacniającego odporność i regenerującego komórki miały osoby deklarujące wykształcenie wyższe oraz należące do grupy wiekowej powyżej 56 lat. Najwięcej informacji o drażniących właściwościach antrachinonów miało niespełna 12% respondentów, natomiast ponad 30% badanych wiedziało, że podczas stosowania aloesu mogą wystąpić reakcje alergiczne. Najbardziej różnicującymi zmiennymi okazały się wykształcenie, a następnie wiek.

EN

Aloe vera is the species with the highest biological activity. Pulp and the juice obtained from its leaves are processed on a large scale all over the world. The respondents, although they declared to use aloe products, appeared to have insufficient knowledge of biologically active components present in aloe. The highest knowledge about the acemannan and its ability to strengthen the immune system and to regenerate cells was possessed by the people who declared to have higher education and were above the age of 56. Less than 12% of the respondents were aware of the irritating properties of anthraquinone, while over 30% of the polled knew that when applying Aloe Vera, allergic reactions may occur. The most discriminative variables were education and then, age.

4

Synthesis of bees’ chitosan based hydrogels containing Aloe vera

Kudłacik-Kramarczyk S., Drabczyk A., Tyliszczak B.

Infrastruktura i Ekologia Terenów Wiejskich

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2017

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nr IV/2

1687--1698

EN

Chitosan based hydrogels due to their specific properties and structure belong to the group of materials widely used in medicine. They are used as drug carriers with controlled release of active substances and in the preparation of innovative wound dressings. The main aim of the conducted research was the choice of the most favorable parameters for carrying the cross-linking reaction by means of UV radiation and microwaves. Subsequently, an adequate composition of the mixture containing chitosan and gelatin for further modification of such prepared the polymer matrix with Aloe vera extract was selected. Subsequently, an impact of introduction of Aloe vera extract into hydrogel on its physicochemical properties and structure was determined. The scope of the research included the measurement of swelling abilities of hydrogels in distilled water and selected simulated body fluids as well as incubation studies aimed at determination of tendency of prepared materials to degradation in previously mentioned fluids and their compatibility in relation to such environments. In order to characterize the chemical structure of the polymers and impact of incubation on this structure spectroscopic analysis was performed. Microscopic analysis was used to define the surface morphology of the hydrogels. Moreover, materials containing Aloe vera extract were subjected to the studies of release of additive from hydrogel matrix. Research was conducted both in acid and alkaline environment.

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Aloe vera – wybrane właściwości biologiczne

Matejczyk M., Golonko A., Chilmon E.

Budownictwo i Inżynieria Środowiska

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2017

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Vol. 8, no. 4

191--195

PL

Aloes jako ludowy medykament o wszechstronnych właściwościach prozdrowotnych jest znany ludzkości od setek lat. Ekstrakty aloesowe cieszą się ogromnym zainteresowaniem farmakologów, medyków oraz kosmetologów. Wykazano, że poszczególne składniki żelu aloesowego są antyoksydantami, stymulantami aktywności układu immunologicznego, mają właściwości antynowotworowe, obniżające poziom cukru i lipidów we krwi, a także wpływają pozytywnie na gojenie się ran czy oparzeń i działają przeciwzapalnie. Ostatnio opublikowano kilka znaczących prac, w których wykazano silne właściwości antyrakowe wybranych składników aloesu. Stąd, amerykańska FDA (ang. Food and Drug Administration) poparła projekty badań naukowych dotyczących zastosowania A. vera w leczeniu raka i AIDS u ludzi. W prezentowanej pracy przedstawiono ogólny skład żelu aloesowego wraz z najbardziej aktywnymi biologicznie substancjami. Scharakteryzowano aktywność antyoksydacyjną i przeciwdrobnoustrojową Aloesu, potencjalne działanie antynowotworowe oraz przedstawiono wpływ żelu aloesowego na przewód pokarmowy człowieka, przemiany węglowodanów, układ immunologiczny i proces gojenia się ran.

EN

Aloe as a folk medicine with comprehensive healthpromoting properties has been known to humanity for hundreds of years. Aloe extracts are very popular among pharmacologists, medics and cosmetologists. It was demonstrated that the individual components of the aloe gel are antioxidants, stimulants of the immune system, have anti-cancer properties, lower blood sugar and lipid levels, and have a positive effect on wound healing, burns and anti-inflammatory effects. Recently, several significant papers have been published in which strong anti-cancer properties of selected aloe components have been demonstrated. Hence, the American Food and Drug Administration (FDA) has endorsed scientific research on the use of A. vera in the treatment of cancer and AIDS in humans. In the presented review, the general properties of Aloe are discussed, biological activity and the potential anti-cancer activity of the main, most active components of this plant are presented.

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Application of Aloe vera gel instead of silicon dioxide as organic dielectric material in microelectronics

Rana S. M., Al-Amin R., Uz-Zaman A., Talukder S. H., Mia N. H., Tayyaba S., Hoq M.

Materials Science Poland

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2015

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Vol. 33, No. 3

635--638

EN

Organic materials are now being used in a wide range of microelectronic applications in parallel with inorganic materials, because of their superior properties, environmental safety, and low cost. This paper describes the characterization of Aloe vera gel (AVG), a new organic dielectric material. The surface morphology, spatial distribution of elements, and structural characteristics of an AVG layer were examined using scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD), respectively. The resistance of the AVG layer, determined using a four-probe station, was 640 Omega. EDX showed that the elements contained in the layer were carbon, oxygen, aluminum, silicon, calcium, potassium, and copper. The XRD results suggested that the sample primarily consisted of bornite (Cu5FeS4), geerite (Cu8S5), sal ammoniac (NH4Cl), and carobbite (KF).

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New thickening agent based on Aloe vera gel for disperse printing of polyester

El-Zairy E. M. R.

Autex Research Journal

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2011

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Vol. 11, no. 2

66--70

EN

The technical feasibility of using Aloe vera gel as a new thickener for printing polyester with disperse dyes was examined. The results indicate that the properties of the printed fabric samples (colour strength, K/S, overall fastness properties, handling and sharpness) were dependent on gel concentration, the type and concentration of additive (i.e. urea or citric acid), as well as the fixation conditions using the super-heated steam technique. The optimum conditions for printing polyester fibre with disperse dyes using Aloe vera gel as a thickener were as follows: 30 g/kg disperse dye, 50 g/kg urea, 15 g/kg citric acid, 500 g/kg Aloe vera thickener and 50% drying at 100°C for 3 min followed by steam fixation for 6 min at 180°C.