West Java artisanal chocolate passes microbiological tests but cadmium flags EU export risk

Artisanal chocolate made by small-scale producers in West Java, Indonesia, has passed a battery of microbiological safety tests with flying colours, but a single white chocolate bar has exposed a quietly growing trade problem: cadmium levels that satisfy Indonesian rules yet fall just short of the European Union’s stricter limits. The finding comes from one of the first studies to examine both microbial and heavy-metal safety across multiple artisanal brands from the region, and it arrives as Indonesia’s small chocolate makers push aggressively into premium export markets.

The brands were drawn from four districts known for cocoa farming: Cianjur, Bandung, Sukabumi and Garut. Sampling took place between December 2024 and January 2025, with laboratory analyses conducted from January to May 2025 at laboratories in Bogor; the chemical analyses were carried out at a laboratory accredited under ISO/IEC 17025. The study used ISO methods for total viable count, yeast and mould enumeration, and Salmonella detection, while lead and cadmium were quantified by ICP-MS at an ISO/IEC 17025-accredited laboratory. Samples were analysed in triplicate (n = 3 per cell), yielding 48 observations per parameter across the eight brands and two chocolate types.

The microbiological results were uniformly reassuring. Every sample met BPOM’s microbiological limits, with total viable counts ranging from 2.5 × 10³ to 4.0 × 10³ colony-forming units per gram, well below the regulatory ceiling of 1.0 × 10⁴ CFU/g. Yeast and mould counts ranged from 1.2 × 10² to 8.5 × 10² CFU/g, again comfortably inside the limit of 5.0 × 10³ CFU/g. Salmonella was not detected in any of the sixteen samples, satisfying the requirement of absence in 25 grams and also meeting equivalent Codex, EU and FSANZ requirements.

Statistical modelling revealed patterns beneath the compliance headlines. A linear mixed-effects model treating chocolate type as a fixed effect and brand as a random effect found that chocolate type significantly influenced yeast and mould counts, with dark chocolate carrying higher fungal loads than white (p = 0.003), but had no significant effect on total viable count (p = 0.12). Brand-to-brand variation, by contrast, was significant for both measures (p < 0.001). The researchers attribute the higher fungal counts in dark chocolate to its richer organic substrate: cocoa solids contain residual proteins, polysaccharides and fermentable carbohydrates that can support fungal growth at trace moisture levels, whereas white chocolate’s cocoa butter is a nearly anhydrous lipid matrix inhospitable to fungal colonisation.

The absence of Salmonella is consistent with roasting functioning as the primary critical control point across all eight producer sites. Roasting at 120 °C or above for at least five minutes is reported to deliver a reduction of at least six log units in vegetative bacteria. The researchers caution, however, that without raw-material or in-process testing and without lot-level traceability, non-detection in finished products cannot on its own formally validate that lethality or rule out low-level post-roasting contamination. Chocolate’s low water activity, between 0.40 and 0.50, prevents Salmonella from multiplying but also encapsulates surviving cells within the fat matrix, extending their persistence and raising their thermal resistance relative to aqueous foods. A large 2022 multi-country outbreak linked to a Belgian facility, with 369 confirmed cases, illustrates that regulatory compliance alone does not guarantee protection against post-roasting contamination events.

On the chemical side, lead was the good news. All sixteen samples complied with lead limits across every applicable regulatory framework examined, including FSANZ Schedule 19’s 0.5 mg/kg limit for confectionery. Dark chocolate lead concentrations ranged from 0.052 ± 0.008 to 0.176 ± 0.024 mg/kg, with an overall mean of 0.104 ± 0.044 mg/kg, while white chocolate ranged from 0.022 ± 0.004 to 0.055 ± 0.010 mg/kg. These values are substantially lower than those reported from comparator markets, including mean lead concentrations of 0.22 to 1.85 mg/kg in United States commercial dark chocolates and 0.31 mg/kg in Nigerian artisanal samples. The researchers suggest the favourable profile likely reflects the relatively recent conversion of many West Java producers to covered concrete or tarpaulin drying surfaces, which reduce the soil-dust contact and atmospheric deposition that otherwise load lead onto bean surfaces during open sun-drying.

Cadmium told a more complicated story. All samples met BPOM’s tiered cadmium limits, which range from 0.30 to 0.90 mg/kg depending on declared cocoa-solid content, but one brand’s white chocolate, at 0.105 ± 0.015 mg/kg, marginally exceeded the EU Regulation 2023/915 threshold of 0.10 mg/kg for milk chocolate with less than 30% dry cocoa solids, an exceedance of roughly five percent. Because the bar complies with Indonesian rules, this is not a domestic safety violation, but it would render that product non-compliant for direct export to EU markets. The study’s authors frame it as a specific, addressable export barrier rather than a general food safety failure, and note that all dark chocolate samples from the sampled brands complied with both BPOM and EU limits.

The underlying driver of the cadmium pattern appears to be geology rather than hygiene. Cadmium is a geogenic contaminant absorbed from soil by cacao roots and translocated to the bean cotyledon, and no roasting, conching, tempering or refining step can remove it from finished chocolate. West Java’s volcanic and andosolic soils, derived from Quaternary volcanic activity, are characteristically enriched in geogenic cadmium at concentrations two to eight times the global soil average. The study found a very strong correlation between declared cocoa-solid content and cadmium concentration (r = 0.92, p < 0.05), and a similarly strong correlation for lead (r = 0.87, p < 0.05). Because cocoa content was taken from label declarations rather than measured analytically, and no soil was sampled at producer or farm level, the researchers emphasise that these are exploratory associations consistent with, rather than direct demonstrations of, the region’s volcanic-soil geochemistry.

The study’s scope carries important caveats. The eight brands were selected by purposive sampling; a provincial scoping exercise identified ten BPOM-registered small-scale producers meeting the eligibility criteria at the time, of which two had temporarily inactive production lines and were excluded, leaving the eight enrolled brands as a near-census of that defined population. Findings remain confined to West Java and to brands offering both dark and white chocolate lines, and should not be extrapolated to other Indonesian provinces. Lot-level traceability to specific fermentation or drying batches was unavailable at every site, no facility inspections were conducted, and ochratoxin A was not directly quantified, with yeast and mould counts serving only as a non-specific sentinel of fungal contamination risk.

The authors conclude that West Java’s artisanal chocolate producers show satisfactory microbiological safety and effective lead management, but that cadmium governance needs priority, particularly for European markets. They recommend bi-annual ICP-MS testing of finished products, pre-shipment verification for EU-bound lots through accredited laboratories, blending of lower-cadmium cocoa nibs into export formulations, raised drying platforms to further curb lead deposition, and formalised HACCP plans designating roasting and enclosed packaging as critical control points. Longer-term proposals include soil cadmium mapping across the volcanic arc, evaluation of low-cadmium-accumulating cacao genotypes, and assessment of total dietary cadmium exposure among Indonesian consumers, whose primary dietary cadmium sources are rice, vegetables and seafood rather than chocolate.

Subject of Research: Microbiological and heavy-metal safety of artisanal dark and white chocolate from small-scale producers in West Java, Indonesia

Article Title: Microbiological and chemical safety of artisanal dark and white chocolate bars from small-scale industries in West Java, Indonesia

Article References: Fabien, G., Hasanah, U., Kusumaningrum, H. D., & Lioe, H. N. (2026). Microbiological and chemical safety of artisanal dark and white chocolate bars from small-scale industries in West Java, Indonesia. Food Safety and Risk, 13(1), Article 42. https://doi.org/10.1186/s40550-026-00166-w

Image Credits: AI Generated

DOI: 10.1186/s40550-026-00166-w

Keywords: chocolate safety, cadmium, lead, West Java, artisanal chocolate, food microbiology, Salmonella, ICP-MS, EU regulation, cocoa, Indonesia, heavy metals