You are here

Technical articles

Products: konjac, carrageenan, agar

Products are sold under the tradenames: CongelK

Andi Johnson Group

Biosynth Carbosynth offer an impressive collection of specialty chemicals and offer custom chemical production. They manufacture and source chemical and biochemical products and in the carbohdyrate field offer monosaccharides, oligosaccharides and polysaccharides. They also specialise in nucleosides, antimicrobials, APIs, enzyme substrates and natural products.

COMMISSION REGULATION (EU) No 231/2012 of 9 March 2012


COMMISSION REGULATION (EU) No 231/2012 of 9 March 2012


Products: alginate, carrageenan, konjac, microcrystalline cellulose/cellulose gel, pectin, hyaluronic acid, systems 
Their products are sold under the tradenames: Seagel, Gelcarin, Lactarin, Viscarin for carrageenan, Nutricol for konjac and Protanal for alginates.

Products: agar, carrageenan, konjac, meat product solution, gummy candy powder, jelly powder, thickening agent


Hydrocolloids can be obtained from a wide variety of sources. The two most abundant polysaccharides are cellulose and starch. Cellulose is the key structural component of trees and is used on a huge scale globally in the pulp and paper industry.

Author: Weiping Wang, Andi Johnson Konjac Company Ltd, 5-403 Long Spring Garden,
118 Yang Bridge West Road, Fuzhou city, China, 350002.

What is Konjac Flour

Konjac flour is obtained from the tubers (roots) of various species of Amorphophallus, a plant that belongs to the family of the Araceae and was originally from South East Asia. It is the source of a water soluble fibre and has been consumed for more than 2,000 years in China and Japan as an important part of oriental dishes. Konjac is called JU RUO in Chinese, and called KONNYAKU by the Japanese in accordance with the Chinese pronunciation for JU RUO.

Cultivation and processing

Although there are more than 130 species of Amorphophallus defined, mainly from Africa and Asia.

Safety and health claims

Konjac is not only used as a traditional food in China, Japan and South-east Asia; it is also registered for food usage in USA and, more recently, in the EU.

Main Properties of Konjac

A gelling, thickening, suspending and film-forming agent.

Structure of Konjac Glucomannan

The primary component in Konjac

Young konjac plant ready for planting out.  Source Andi Johnson (2004)

Konjac plant

Konjac tubers. Source Andi Johnson (2004)

Konjac corms

Prepared at the 46th JECFA (1996), published in FNP 52 Add 4 (1996) superseding specifications prepared at the 39th JECFA (1993), published in FNP 52 Add 3 (1993). Metals and arsenic specifications revised at the 57th JECFA (2001). An ADI 'not specified' was established at the 46th JECFA (1996)

Konjac plantation in China. Source Andi Johnson (2004)

Konjac plantation

Sprouting konjac tubers.  Copyright Andi Johnson and CyberColloids (2004)

Konjac tubers

Products: konjac 
Their products are sold under the tradenames: Propol, Rheolex

Products: guar, locust bean gum, tara, knojac
Their products are sold under the tradenames: Vidogum, Vidocrem


Products: agar, carrageenan, konjac, alginate

Yantai Sheli Hydrocolloids Co., Ltd., is a wholly-owned subsidiary of Kam Yuen International Company