Can you help us in providing information about small scale steviosisde extraction unit (up to 100 kg dried leaf processing/day)? thank you for your help
Dear Sir. Concerning your issue about the small scale steviosisde extraction unit. The sweet diterpene glycosides of stevia have been the subject of a number of reviews (Kinghorn and Soejarto 1985, Crammer and Ikan 1986, and Hanson and De Oliveira 1993). Although interest in the chemistry of the sweet principles dates from very early in the century, significant progress towards chemical characterization was not made until 1931, with the isolation of stevioside (Bridel and Lavieille 1931a). The water extract is clarified by electro-coagulation Steviol glycoside is extracted from the aqueous extract in a continuous countercurrent liquid liquid extraction column with a water immiscible alcohol mixture. For more details about the extraction techniques you can see the following below links may help you in your extraction:
http://www.steviashantanu.com/resin-free-stevia-extraction-technology
Thanks
Thank you so much for you soonest and comprehensive response. Lets keep in touch.
Dear Beemnie
The answer to your question is YES, there is a stevia extractor for 100kg dried leaf per day. But the question is : Do we call this small scale? Because I have known other extractors even below that like 50 kg. Among these, the normal solvent based extractor (water or alcohol) is almost 96% efficient and doesn't consume much energy. The 100 kg extractor has an optimum capacity of extracting 1000 lit.(Extraction tank size). There are extractors (Based on a researched 1:10 dried leaf to solvent ratio where the solvent is water. There are also Ultrasonic extractors more efficient but energy consuming. They operate with an extra ultrasonic transducers. I never remember any company using ultrasonic machines for the purpose of extraction. The extraction of Stevioside is a bit deeper than steviol glycosides (A combination of Stevioside and other glycosides). Let alone the stevioside, even the process of extracting highly purified liquid stevia follows a series of production lines and steps rather than a single machine. It follows the steps of for instance water extraction, followed by, Flocculation, Filtration, Adsorption and decolourization through Ion exchange,Concentration, micro filtration,sterilization and spray drying. (Even this step if not sufficient for the extraction of stevioside....rather yields bleached and white crystalline steviol glycosides). For More details you can contact Mr. Shantanu Chakraborty as per the link forwarded by Mr. Isam Eldin Hussein Elgailani. But I am afraid that the information provided as you go through the link is not even 10% of the knowledge needed to run the whole extraction facility. Thank You Beemnie and lets keep in touch
Thank you Mr. Yared Mesfin for your reply. But, do we have practical experience on the issue that you explained? If so please forward your experiences and challenged faced while doing it. Thank you for your response.
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