# Java Blawan (Coffea arabica) **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/java-blawan **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-24 **Evidence Score:** 2 / 10 **Category:** Coffee Cultivars **Also Known As:** Coffea arabica var. Java Blawan, Blawan Estate Coffee, Ijen Plateau Arabica, East Java Blawan, Indonesian Arabica Blawan, Washed Java Blawan ## Overview Java Blawan is a historic Coffea arabica cultivar grown on the slopes of Mount Ijen in East Java, Indonesia, prized for its distinctive cup profile shaped by volcanic soil mineral composition and processing methods. Like all Arabica coffees, its primary bioactive compounds include caffeine and chlorogenic acids, though no clinical research has isolated health outcomes specific to this cultivar. ## Health Benefits • No clinical health benefits documented - available research only describes agricultural and sensory characteristics • General coffee consumption benefits cannot be specifically attributed to this cultivar without clinical data • No evidence quality can be assigned due to absence of biomedical studies • No therapeutic effects have been investigated in human trials • No pharmacological properties have been characterized in the available literature ## Mechanism of Action Caffeine, the primary psychoactive alkaloid present in Java Blawan as a Coffea arabica cultivar, acts as an adenosine receptor antagonist, blocking A1 and A2A receptors to promote wakefulness and reduce perceived fatigue. Chlorogenic acids, particularly 5-caffeoylquinic acid, inhibit glucose-6-phosphatase and may modulate postprandial glucose absorption by slowing intestinal glucose transport via SGLT1. These general Arabica-class mechanisms have not been studied in isolation for the Blawan cultivar specifically, so compound concentrations and downstream effects may differ from published Arabica averages. ## Clinical Summary No clinical trials, observational studies, or pharmacokinetic studies have been conducted specifically on Java Blawan coffee. Available literature is limited to agricultural reports, geographical indication documentation, and sensory evaluation studies describing its flavor as earthy with herbal and low-acid characteristics due to wet-hulling processing. General health associations drawn from broad coffee research — such as reduced type 2 diabetes risk or [cognitive performance](/ingredients/condition/cognitive) benefits — cannot be reliably extrapolated to this cultivar without cultivar-specific phytochemical profiling and human intervention data. The evidence quality for any health claim attributed directly to Java Blawan must currently be rated as insufficient. ## Nutritional Profile Java Blawan (Coffea arabica) nutritional composition is based on general Arabica coffee bean data, as cultivar-specific nutritional analysis is not documented in available literature. Raw green beans contain approximately 10-13% water, 10-12% protein (primarily storage proteins and enzymes), 15-18% total lipids (dominated by diterpenes cafestol and kahweol, triglycerides, and free fatty acids), and 38-42% total carbohydrates (including sucrose ~6-9%, polysaccharides, and dietary fiber ~20-25% in dry matter). Chlorogenic acids (primary bioactive compounds) are present at approximately 6-10% of dry weight in green beans, with 5-caffeoylquinic acid being the dominant isomer; these degrade significantly during roasting to 1-4% in light roasts and further in dark roasts. Caffeine content is approximately 1.2-1.5% of dry weight, typical for Arabica cultivars (lower than Robusta). Trigonelline is present at 0.6-1.2%, partially converting to niacin (vitamin B3) during roasting. Roasted beans contain measurable niacin (~10-15 mg per 100g), small amounts of potassium (~1600-1800 mg/100g in dry grounds), magnesium (~150-200 mg/100g), and trace manganese. Brewed coffee (240ml serving) delivers approximately 70-140mg caffeine, 70-200mg chlorogenic acids, 2-5mg niacin, and 100-150mg potassium. Bioavailability of chlorogenic acids from brewed coffee is estimated at 30-60%. Java Blawan's high-altitude volcanic soil origin (Ijen Plateau, East Java) may influence mineral uptake and chlorogenic acid concentrations, but no quantified cultivar-specific data exists to confirm deviation from standard Arabica ranges. ## Dosage & Preparation No clinically studied dosage ranges are available for Java Blawan coffee. Standard coffee preparation methods apply for culinary use. Consult a healthcare provider before starting any new supplement. ## Safety & Drug Interactions As a Coffea arabica product, Java Blawan carries the standard safety profile of caffeinated coffee: doses exceeding 400 mg of caffeine daily (roughly 4 cups) are associated with anxiety, tachycardia, [insomnia](/ingredients/condition/sleep), and gastrointestinal distress in healthy adults. Caffeine interacts with adenosine-based medications, can potentiate sympathomimetics, reduce lithium clearance, and may diminish the efficacy of benzodiazepines. Pregnant individuals are advised to limit total caffeine intake to under 200 mg per day due to associations with reduced fetal growth at higher doses. Individuals with hypertension, arrhythmias, anxiety disorders, or GERD should consult a healthcare provider before regular consumption. ## Scientific Research No clinical trials, RCTs, or meta-analyses were found in the available research for Java Blawan coffee. The search results contain only agricultural production information and sensory profiles, lacking any biomedical or clinical literature. ## Historical & Cultural Context No traditional medicinal or cultural health applications are documented in the available research. The sources only describe Java Blawan as a specialty coffee cultivar valued for its sensory characteristics. ## Synergistic Combinations No synergistic ingredients identified due to lack of biomedical research ## Frequently Asked Questions ### What is Java Blawan coffee and where does it come from? Java Blawan is a Coffea arabica cultivar grown on the Blawan Estate near Mount Ijen in East Java, Indonesia, at elevations between 900 and 1,600 meters. The estate is one of the oldest Dutch colonial coffee plantations in Indonesia, and the coffee's flavor profile is influenced by volcanic basaltic soil, high rainfall, and traditional wet-hulling processing known as Giling Basah. ### Does Java Blawan coffee have proven health benefits? No clinical studies have documented health benefits specific to Java Blawan. While Coffea arabica broadly contains caffeine and chlorogenic acids associated with benefits like improved alertness and antioxidant activity in general coffee research, none of these findings have been validated for this specific cultivar. Any health claims for Java Blawan remain speculative without cultivar-specific biomedical studies. ### How much caffeine does Java Blawan coffee contain? No published laboratory analysis has reported the precise caffeine content of Java Blawan specifically. Coffea arabica varieties generally contain between 0.9% and 1.7% caffeine by dry weight, yielding approximately 80–120 mg of caffeine per 8-ounce brewed cup depending on roast level, grind size, and brew method. Until cultivar-specific assays are published, these general Arabica ranges remain the best available estimate. ### Can Java Blawan coffee interact with medications? As a caffeinated Coffea arabica product, Java Blawan can interact with several drug classes. Caffeine inhibits CYP1A2 metabolism, potentially elevating plasma levels of clozapine and theophylline. It also competes with adenosine receptor agonists used in cardiac stress testing and may reduce the sedative effect of benzodiazepines, so patients on these medications should discuss coffee consumption with their prescribing clinician. ### Is Java Blawan coffee safe during pregnancy? Java Blawan, like any caffeinated coffee, should be consumed with caution during pregnancy. Major health organizations including the WHO and ACOG recommend limiting total caffeine intake to 200 mg per day during pregnancy, as higher intakes are associated with increased risk of low birth weight and preterm birth. One to two small cups of brewed Java Blawan per day would likely remain within this threshold, but exact caffeine content for this cultivar has not been independently verified. ### How does Java Blawan coffee compare to other Arabica cultivars in terms of flavor and composition? Java Blawan is distinguished by its earthy, full-bodied flavor profile with low acidity and herbal notes, which results from the specific terroir of Indonesia's volcanic soils and high-altitude growing conditions. Unlike many other Arabica cultivars, Java Blawan typically exhibits a heavier body and deeper complexity, making it popular for espresso blends and dark roasts. However, these sensory differences reflect agricultural and processing variations rather than clinically significant differences in nutritional composition between cultivars. ### What is the typical caffeine content of Java Blawan compared to other coffee cultivars? Java Blawan contains approximately 1.2–1.5% caffeine by dry weight, which is consistent with most Arabica coffee varieties and generally lower than Robusta cultivars. Actual caffeine intake depends more on brewing method, cup size, and roast level than on the cultivar itself, as these factors have greater influence on the final caffeine concentration in your cup. The processing and roasting of Java Blawan beans may slightly affect caffeine retention, though these differences are minimal. ### Are there any known sensitivities or considerations specific to Java Blawan coffee consumption? Java Blawan coffee carries the same safety considerations as any coffee product, including potential for caffeine sensitivity, digestive effects, and interactions with certain medications—though no cultivar-specific adverse effects have been documented. Individuals sensitive to coffee's acidity or caffeine effects should consult their healthcare provider, as these properties apply universally to coffee consumption regardless of origin or cultivar. The absence of clinical research specific to this cultivar means safety profiles are based on general coffee science rather than Java Blawan-specific data. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*