Effects of pretreatment methods on sensory profile and toxic compounds in groundnuts (Arachis hypogaea) meant for ready-to-use therapeutic food (RUTF) production

Abstract

Aim: Ready-to-use therapeutic food (RUTF) is central to the Integrated Community-Based Management of Acute Malnutrition (ICMAM) but is largely imported, making it costly and inaccessible in developing countries. Consequently, nutrient-rich groundnuts are commonly used in local RUTF formulation; however, their susceptibility to contamination necessitates pretreatment. This study evaluated the effects of various pretreatments on aflatoxin and heavy/trace metals levels and sensory attributes of three groundnut cultivars (SAMNUT-23, SAMNUT-24, and SAMNUT-26) commonly used in RUTF formulation in Sokoto, Nigeria. Methods: Groundnut consumption was assessed using a structured questionnaire and oral interviews among 800 randomly selected participants (500 adults and 300 children), with intake data collected via a 7-day 24-hour dietary recall. Sensory evaluation was conducted by a 100-member panel using a nine-point hedonic scale, followed by pretreatment and laboratory analyses (anti-nutrients, heavy metals, and aflatoxins) using standard analytical methods. Results: Sensory evaluation showed that SAMNUT-23 had the highest acceptability (7.57), with superior color, taste, and texture. Normal saline soaking followed by roasting further enhanced sensory qualities, yielding the highest scores for taste (8.00), aroma (7.13), texture (7.26), and overall acceptability (7.86). This pretreatment significantly reduced aflatoxin B1, B2, and G2, as well as anti-nutrients (phytate and oxalate), thereby improving nutritional quality and mineral bioavailability. Heavy metal concentrations (Cd, Cr, Ni, Zn, and Pb) were within FAO/WHO permissible limits. Estimated daily intakes of aflatoxins and heavy metals were below tolerable limits for both children and adults. Although untreated SAMNUT-23 posed a marginal non-carcinogenic risk for children due to Cd exposure [hazard index (HI) > 1], pretreatment reduced all risk indices to safe levels. Margin of exposure values for aflatoxins exceeded 10,000, indicating low public health concern. Conclusions: Normal saline soaking followed by roasting effectively improves the safety and sensory quality of SAMNUT-23, supporting its suitability for RUTF production.

Keywords

aflatoxin / estimated daily intake (EDI) / heavy metals / ready-to-use therapeutic food (RUTF) / SAMNUT-23

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