Neohesperidin dihydrochalcone

Neohesperidin dihydrochalcone is a dihydrochalcone, a class of compounds formed by hydrogenation of chalcones. Its structure consists of a neohesperidose disaccharide (rhamnose-glucose) attached to a phloretin aglycone. The compound is synthesized by catalytic hydrogenation of neohesperidin, a bitter flavonoid abundant in the peel of Citrus aurantium (Seville orange) and other citrus species.¹ The process yields a white crystalline powder with a high sweetness potency and a slow-onset, lingering sweetness profile. NHDC is stable under typical food processing conditions, including heat and acidic pH, but can degrade under prolonged exposure to strong alkaline conditions.

NHDC exhibits a sweetness that is 1500–1800 times that of sucrose, with a taste profile that includes a slight menthol-like cooling sensation and a bitter aftertaste at high concentrations. It is often used in combination with other sweeteners, such as aspartame or acesulfame K, to improve flavor synergy and mask off-notes. In foods and beverages, NHDC serves as a flavor enhancer and bitterness masker, particularly in citrus-flavored drinks, chewing gum, dairy products, and confectionery. It also finds use in pharmaceutical formulations to mask the bitter taste of active ingredients, such as antibiotics and analgesics.² Its low use levels (typically 0.1–0.5 ppm in beverages) make it cost-effective despite its relatively high price per kilogram.

Neohesperidin dihydrochalcone is approved as a food additive in the European Union (E number E959) and in several other countries, including Japan and Australia. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) established an acceptable daily intake (ADI) of 5 mg/kg body weight per day, based on toxicological studies showing no adverse effects in animal models. In the United States, NHDC is not generally recognized as safe (GRAS) for use as a sweetener, but it is permitted as a flavoring agent under certain conditions. Studies have shown that NHDC is not metabolized to neohesperidin and is largely excreted unchanged, indicating low systemic absorption.

Beyond its role as a sweetener, NHDC has been investigated for potential bioactivities. Research suggests it may have antioxidant and anti-inflammatory properties, although these effects are not yet clinically established. NHDC also exhibits a synergistic sweetness-enhancing effect when combined with other high-intensity sweeteners, allowing for reduced total sweetener usage. Historically, the discovery of NHDC's sweetness was serendipitous, arising from studies on the bitterness of citrus flavonoids in the 1960s.¹ Interestingly, NHDC is one of the few sweeteners that can enhance the perception of saltiness, which has potential applications in sodium-reduced foods. Additionally, NHDC is used in some animal feed to improve palatability, and it has been studied as a potential insect antifeedant.³

Dihydrochalcone

A class of flavonoids characterized by a chalcone structure with a saturated double bond, often used as sweeteners.

Neohesperidose

A disaccharide composed of rhamnose and glucose, found in citrus flavonoids.

ADI

Acceptable Daily Intake, the maximum amount of a substance that can be consumed daily over a lifetime without appreciable health risk.

GRAS

Generally Recognized As Safe, a US FDA designation for substances considered safe for their intended use.