scholarly journals Comparison between Two Solid-Liquid Extraction Methods for the Recovery of Steviol Glycosides from Dried Stevia Leaves Applying a Numerical Approach

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 105 ◽  
Author(s):  
Monica Gallo ◽  
Andrea Formato ◽  
Gaetano Formato ◽  
Daniele Naviglio
Keyword(s):  
Stevia Rebaudiana ◽  
Value Added ◽  
Numerical Approach ◽  
Extraction Process ◽  
Extraction Methods ◽  
Liquid Extraction ◽  
Steviol Glycosides ◽  
Stevia Rebaudiana Bertoni ◽  
Solid Liquid Extraction ◽  
Solid Liquid

Abstract: Stevia rebaudiana Bertoni is a perennial shrub belonging to the Asteraceae family. The leaves contain a mixture of steviol glycosides with extraordinary sweetening properties, among which the most important are stevioside and rebaudioside A. These components have a high sweetening power, which is about 300 times that of sucrose, and a negligible calorie content. However, their extraction and purification are not easy. In this paper, the extraction technique under cyclic pressure, known as rapid solid-liquid dynamic extraction (RSLDE), was compared using a Naviglio extractor (NE) with conventional maceration. The aim was to identify an efficient and economically viable method for obtaining high amounts of steviol glycosides in a short time. Furthermore, a numerical model was set up for the solid-liquid extraction process of value-added compounds from natural sources. Several parameters must be evaluated in relation to the characteristics of the parts of the plant subjected to extraction. Therefore, since diffusion and osmosis are highly dependent on temperature, it is necessary to control the temperature of the extraction system. On the other hand, the final aim of this work was to provide a scientific and quantitative basis for RSLDE. Therefore, the results obtained from stevia extracts using the corresponding mathematical model allowed hypothesizing the application of this model to the extraction processes of other vegetable matrices.

scholarly journals EKSTRAKSI SILIKA DARI ABU SEKAM PADI DENGAN PELARUT KOH

Konversi ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 28
Author(s):  
Galang Fajar Agung M ◽  
Muhammad Rizal Hanafie Sy ◽  
Primata Mardina
Keyword(s):  
Raw Materials ◽  
Operation Time ◽  
Extraction Process ◽  
Liquid Extraction ◽  
Waste Material ◽  
Alkali Solution ◽  
Rice Husks ◽  
Solid Liquid Extraction ◽  
The One ◽  
Solid Liquid

Sekam padi sebagai limbah yang berlimpah khususnya di negara agraris, adalah salah satu sumber penghasil silika terbesar. Sekam padi mengandung sekitar 90%-98% silika setelah mengalami pembakaran sempurna. Pengambilan silika dari abu sekam padi dilakukan dengan proses ekstraksi padat cair menggunakan larutan alkali sebagai pelarut. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh konsentrasi larutan alkali dan waktu operasi terhadap yield dari silika. Proses ekstraksi dilakukan dalam skala laboratorium. Sepuluh gram abu sekam padi dimasukkan ke dalam 60 mL larutan alkali dengan konsentrasi tertentu (5%w/w, 10% w/w dan 15% w/w) untuk diekstrak kandungan silika dengan waktu operasi tertentu (30, 60 dan 90 menit). Setelah proses ekstraksi selesai, larutan tersebut ditambahkan larutan HCl 1 N untuk mengendapkan silika. Silika yang terbentuk kemudian dipisahkan dari sisa larutan dengan penyaringan. Untuk menghilangkan kelembaban pada silika yang dihasilkan, maka dilanjutkan dengan proses pengeringan. Hasil penelitian menunjukkan yield silika terbesar adalah 50,49% terjadi pada KOH 10% dan waktu ekstraksi 90 menit.  Keywords: abu sekam padi, silika, KOH  Rice husks, the most abundant waste material in agricultural country, is the one of the silica rich raw materials. Rice husks contain about 90%-98% of silica after completed combustion. Recovery silica from ash of  rice husks was done by solid-liquid extraction using alkali solution. Different concentration of alkali solution (5% w/w, 10% w/w and 10% w/w) and different operation time (30, 60 and 90 minutes) were used to investigate their influence on yields of silica. The extraction process was carried out in laboratory scale. After extraction, process was continued by acidic solidification, filtration and drying. The result showed the biggest yield of  silica was 50, 49% at 10% KOH for 90 minutes . Keywords: ash of rice husks, silica, KOH

scholarly journals Chemistry and analytical techniques for ent-kaurene-glycosides of Stevia rebaudiana Bertoni - A review

2017 ◽  
Vol 9 (4) ◽  
pp. 2114-2126 ◽  
Author(s):  
Neena Kumari ◽  
Suresh Kumar
Keyword(s):  
Quantitative Estimation ◽  
Stevia Rebaudiana ◽  
Analytical Techniques ◽  
Extraction Methods ◽  
Estimation Methods ◽  
Steviol Glycosides ◽  
Rebaudioside A ◽  
Stevia Rebaudiana Bertoni ◽  
The World ◽  
Low Calorie Sweetener

The Stevia genus encompasses about 200 herbs and shrubs species. Stevia rebaudiana, one of the members has gained commercial importance as a natural low calorie sweetener, due to the presence of high con-centration of stevioside and rebaudioside - A (25% to 45% of stevioside content) in the leaves. The major processes involved in the production and quantification of steviol glycosides are extraction, purification and estimation. Various extraction methods have been used for extraction of steviol glycosides in the world. The extraction methods of steviol glycosides mostly differed at the stage of clarification of extracts. The present study is an attempt to summarize the scattered literature and reports on a single podium. Moreover, it also depicts up to date literature regarding numerous extraction, purification and quantitative estimation methods for steviol glycosides

scholarly journals Natural sweeteners: health benefits of stevia

2018 ◽  
Vol 6 (2) ◽  
pp. 392-402 ◽  
Author(s):  
Sukhmani Gandhi ◽  
Sukhmani Gandhi ◽  
Yogesh Gat ◽  
Yogesh Gat ◽  
Shalini Arya ◽  
...  
Keyword(s):  
Food System ◽  
Stevia Rebaudiana ◽  
Value Added ◽  
Current Status ◽  
Steviol Glycosides ◽  
Artificial Sweetener ◽  
Stevia Rebaudiana Bertoni ◽  
Food Properties ◽  
Perennial Shrub ◽  
Health Promoting

Stevia rebaudiana (Bertoni), a perennial shrub, is the sweetest plant belonging to the Asteraceae family. Stevia leaves are an excellent source of diterpene glycosides stevioside, rebaudioside A-F, dulcoside, and steviolbioside, which are responsible for sweetness and have been utilized commercially for sugar substitution in foods, beverages, and medicines. To the best of our knowledge, a large number of studies have been carried out on composition, health implications, and safety of steviol glycosides. However, commercial production of stevia-incorporated food products needs further research in order to meet the huge global demand. Stevia-incorporated products possess better sweetening potency and maximum consumer acceptability, when compared with other sugar substitutes. Hence, the current research attempts to review the health promoting effects of stevia with special emphasis on its application in the food system. The paper majorly features 1) the anti-hyperglycemic, anti-hypertensive, anti-caries, anti-inflammatory, and anti-cancer benefits of stevia, 2) value-added stevia-incorporated products, e.g. bakery, dairy, and beverages, 3) the effect of incorporation of stevia on physicochemical, rheological, and nutritional food properties, 4) the current status and regulatory perspective of utilizing stevia at national and international level. Due to legislative actions and growing consumer awareness, public interest in natural sweeteners has significantly increased. Since the use of artificial sweetener has recently been questioned, the data the present article provides will be useful for consumers and manufacturers that seek an alternative.

Kinetics of the Solid-Liquid Extraction Process of Phenolic Antioxidants and Antioxidant Capacity from Hop (Humulus lupulus L.)

2014 ◽  
Vol 50 (11) ◽  
pp. 1658-1664 ◽  
Author(s):  
Dušan Đ. Paunović ◽  
Snežana S. Mitić ◽  
Gordana S. Stojanović ◽  
Milan N. Mitić ◽  
Branka T. Stojanović ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Extraction Process ◽  
Liquid Extraction ◽  
Humulus Lupulus ◽  
Phenolic Antioxidants ◽  
Humulus Lupulus L ◽  
Solid Liquid Extraction ◽  
Solid Liquid ◽  
Kinetics Of

scholarly journals The estimation of kinetic parameters of the solid-liquid extraction process of the lavender flower (Lavandula x hybrida L.)

2018 ◽  
Vol 10 (1) ◽  
pp. 64-72 ◽  
Author(s):  
ANA-MARIJA CVETKOVIC ◽  
◽  
TAMARA JURINA ◽  
DAVOR VALINGER ◽  
ANA JURINJAK TUSEK ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Extraction Process ◽  
Liquid Extraction ◽  
Solid Liquid Extraction ◽  
Solid Liquid

scholarly journals Modelling of solid-liquid extraction process of total polyphenols from soybeans

2010 ◽  
Vol 28 (No. 3) ◽  
pp. 206-212 ◽  
Author(s):  
S. Jokić ◽  
D. Velić ◽  
M. Bilić ◽  
A. Bucić-Kojić ◽  
M. Planinić ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Aqueous Ethanol ◽  
Extraction Process ◽  
Extraction Yield ◽  
Liquid Extraction ◽  
Ethanol Solution ◽  
Aqueous Ethanol Solution ◽  
Total Polyphenols ◽  
Solid Liquid Extraction ◽  
Solid Liquid

The influence of the solvent, temperature, and extraction time on the extractability of total polyphenols from milled soybeans variety Ika was investigated. The study was performed in order to select the most suitable solvent (water; 50, 60, 70, and 80% aqueous ethanol) for achieving the highest yield of total polyphenols. The most effective solvent (50% aqueous ethanol solution) was used for monitoring the kinetics and modelling of solid-liquid extraction of total polyphenols from soybeans, average particle size 0.459 mm, at solid-liquid ratio of 20 ml/g (ratio of the solvent volume per g of raw material). The total polyphenols content in the soybean extract was determined spectrophotometrically using Folin-Ciocalteu micro-methods at 765 nm. The applicability of different mathematical models (Peleg, Page, and Logarithmic models) to describe the kinetics of the solid-liquid extraction process of total polyphenols from soybeans was studied as well. The results exhibited a significant influence of the solvent and temperature on the kinetics and extraction yield of total polyphenols from soybeans. The best extraction yield of total polyphenols was obtained using 50% aqueous ethanol solution at 80&deg;C after 120 min (4.322 mg GAE/g<sub>db</sub>). The extraction yield of total polyphenols in soybean extracts increased by increasing the extraction temperature and extending the duration of the extraction process. The mathematical models applied showed a good agreement with the experimental results, which allows their application in modelling and optimisation of solid-liquid extraction process for the extraction of total polyphenols from soybeans.

scholarly journals Microwave-Assisted Subcritical Water Extraction of Steviol Glycosides From Stevia rebaudiana Leaves

2019 ◽  
Vol 14 (6) ◽  
pp. 1934578X1986000 ◽  
Author(s):  
Zheng Yang ◽  
Brandon Uhler ◽  
Tristan Lipkie
Keyword(s):  
Subcritical Water ◽  
Stevia Rebaudiana ◽  
Cost Effective ◽  
Extraction Methods ◽  
Water Extraction ◽  
Steviol Glycosides ◽  
Subcritical Water Extraction ◽  
Steviol Glycoside ◽  
Stevia Rebaudiana Bertoni ◽  
Green Approach

A rapid method that combines microwave heating and subcritical water extraction to extract steviol glycosides from Stevia rebaudiana (Bertoni) or stevia leaves was developed and compared to conventional thermal solvent extraction methods. Within only 1 minute after subcritical water condition at 140°C being reached, the yields of major steviol glycoside, rebaudioside A and stevioside, and less polar steviol glucoside, rebaudioside C, from stevia leaves were comparable to conventional extraction method that used 70% ethanol under sonication for 45 minutes. This new hybrid extraction technique may provide a cost-effective and green approach for commercial production of high-purity steviol glycoside sweeteners and their “organic” versions without the use of highly expensive “organic” ethanol.

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