KARAYA, GUM (STERCULIA URENS ROXB.)

CAS: 9000-36-6 EMULSIFIER OR EMULSIFIER SALT, FLAVOR ENHANCER, FORMULATION AID, STABILIZER OR THICKENER, TEXTURIZER

Karaya gum is a natural plant‑derived gum obtained as an exudate from the Sterculia urens tree and related species. It functions as a polysaccharide thickener, stabilizer, emulsifier and texturizer used in foods under specific regulatory approvals.

What It Is

Karaya gum is a plant‑derived natural polysaccharide obtained from the dried exudate of Sterculia urens and related species of trees. It is identified by the CAS number 9000‑36‑6 and, under international food additive nomenclature, is associated with the INS number 416 as a gum additive that supports texturizing functions. According to the Joint FAO/WHO Expert Committee on Food Additives (JECFA), this ingredient belongs to the class of complex high‑molecular‑weight polysaccharides composed largely of acetylated sugars including galactose, rhamnose, and galacturonic acid. JECFA evaluations have categorized this substance functionally within thickening, stabilizing, and emulsifying roles in food processing, without allocating a numerical ADI because of its minimal systemic metabolism and long history of safe use at levels consistent with technological necessity. JECFA’s INS classification confirms the additive’s identity and functional designation for international regulatory reference. In the European Union, karaya gum carries the E number E416 and has been subject to re‑evaluation by the EFSA Panel on Food Additives and Nutrient Sources Added to Food. While specific numeric ADI values are not universally established in publicly accessible summaries, its authorized status reflects regulatory confidence in its safety when used as intended in food products. (European Food Safety Authority

Adi Example Calculation

Because karaya gum has an ADI of “not specified,” a numeric example calculation is not applicable. The ADI “not specified” reflects that safety assessments have not identified a threshold of concern for typical food additive exposures when used as intended in food products.

Safety And Health Research

Safety research on karaya gum encompasses toxicological evaluations in animals and observations in humans consistent with its extensive use as a food additive. JECFA and other expert bodies have concluded that karaya gum exhibits minimal systemic toxicity due to its nature as a high‑molecular‑weight polysaccharide that is largely not absorbed in the gastrointestinal tract. Mutagenicity and genotoxicity studies show no evidence of DNA damage at relevant exposures, and long‑standing historical use has not revealed specific hazard signals when the additive is used within technological necessity. Available short‑term feeding studies in rodents and limited human observations support the conclusion that karaya gum is not associated with adverse effects at doses consistent with food additive use. The designation of an “ADI not specified” by JECFA reflects this weight of evidence, implying that daily intake from food is not expected to pose health concerns for the general population under typical consumption scenarios. Attention has been given to respiratory exposure in occupational contexts, where powdered gums, like other natural polysaccharides, can act as respiratory sensitizers if inhaled as dust.

Acceptable Daily Intake Explained

An acceptable daily intake (ADI) is a regulatory concept used to indicate a level of daily exposure to a food additive that, based on available data, is not expected to cause harm over a lifetime. For karaya gum, JECFA has assigned an ADI of “not specified,” which means that studies and historical use suggest that typical dietary exposures do not raise safety concerns. This designation does not imply a specific numeric value but rather communicates that, within the scope of good manufacturing practices, intake from food is considered safe.

Comparison With Similar Additives

Karaya gum shares functional similarities with other natural hydrocolloid gums used in food formulation, such as guar gum and xanthan gum. Each of these ingredients serves to modify texture, provide viscosity and stabilize dispersed systems. Compared with guar gum, karaya gum can impart a different gel strength and water‑binding profile, which may be chosen based on specific formulation needs. Xanthan gum, often used for its shear‑thinning behavior, can complement or replace karaya gum in systems where freeze–thaw stability or suspension of particulates is critical. While all these gums function as thickening agents, the choice among them depends on the desired rheological and sensory attributes in the finished food product.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 184.1349

EFSA

  • Notes: Numeric EFSA ADI not explicitly found in the d opinion summary.
  • Approved: True
  • E Number: E416

JECFA

  • Notes: JECFA ADI not specified reflects available evaluations; specific year not explicitly shown on d page.
  • Ins Number: 416
  • Adi Display: ADI not specified

Sources

Comments

No comments yet. Be the first to share!