# item.guide
Side-by-Side Comparison Food Additives & E-Numbers

E101: Riboflavin (Vitamin B2 Yellow Color) vs. E251: Sodium Nitrate (Chile Saltpeter / Slow Curing)

Comparing 2 standards across 9 specifications. 9 key differences identified.

Comparing:
E101: Riboflavin (Vitamin B2 Yellow Color)
E251: Sodium Nitrate (Chile Saltpeter / Slow Curing)
E101: Riboflavin (Vitamin B2 Yellow Color) →

E101 (Riboflavin / Vitamin B2) is an authorized yellow food colorant and essential micronutrient produced via microbial fermentation of Ashbya gossypii. INS 101(i), ADI is 0.5 mg/kg bw/day, commonly used to fortify cereals and color sauces.

View full E101: Riboflavin (Vitamin B2 Yellow Color) spec sheet →
E251: Sodium Nitrate (Chile Saltpeter / Slow Curing) →

E251 (Sodium Nitrate / NaNO3) is an inorganic salt serving as a slow-release chemical reservoir of nitrite in long-aged cured meats and hard cheeses. INS 251, ADI is 3.7 mg/kg bw/day, enzymatically reduced into nitrite over months of curing.

View full E251: Sodium Nitrate (Chile Saltpeter / Slow Curing) spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
E101: Riboflavin (Vitamin B2 Yellow Color)
E251: Sodium Nitrate (Chile Saltpeter / Slow Curing)
E-Number Code
E101 E251
INS / Codex Number
INS 101(i) INS 251
Functional Class
Food Color (Yellow-Orange), Nutrient Fortificant Preservative, Curing Agent, Antimicrobial
Acceptable Daily Intake (ADI)
0.5 mg / kg body weight per day 3.7 mg / kg body weight per day (as nitrate ion)
Chemical Formula
C17H20N4O6 NaNO3
Primary Mechanism
Yellow chromophore acting as precursor to flavin coenzymes (FAD/FMN) Micrococcus and Staphylococcus bacterial nitrate reductase slowly converts nitrate (NO3-) into bioactive nitrite (NO2-)
Common Target Foods
Fortified breakfast cereals, baby foods, pasta, dairy desserts, energy drinks Prosciutto di Parma, dry-cured salamis, Gouda cheeses (prevents late blowing by Clostridium tyrobutyricum)
Dietary Compliance
100% Vegan (Microbial fermentation), Halal, Kosher Mineral synthesis, Halal, Kosher, Vegan compliance
Safety Approval
EFSA Authorized / FDA GRAS (21 CFR 73.450) EFSA Authorized / FDA 9 CFR 424.21

Other Alternatives to Compare

Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E100: Curcumin (Turmeric Yellow Color) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E140: Chlorophyll & Chlorophyllins (Green Color) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E150a: Plain Caramel (Class I Caramel Color) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E150d: Sulfite Ammonia Caramel (Class IV Caramel) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E160a: Beta-Carotene (Provitamin A Orange Color) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E160c: Paprika Extract (Capsanthin / Capsorubin) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E162: Beetroot Red (Betanin) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E163: Anthocyanins (Grape Skin & Berry Red/Purple) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E170: Calcium Carbonate (Mineral White Color / Anti-Caking) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E200: Sorbic Acid (Antifungal Preservative) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E202: Potassium Sorbate (Soluble Antimicrobial) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E211: Sodium Benzoate (Acid Beverage Preservative) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E220: Sulfur Dioxide (Antioxidant & Wine Preservative) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E224: Potassium Metabisulfite (Campden Salt) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E250: Sodium Nitrite (Curing Salt / Anti-Botulism Preservative) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E260: Acetic Acid (Vinegar Acidulant / Preservative) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E270: Lactic Acid (Biological Acidulant) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E282: Calcium Propionate (Bread Anti-Mold) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E290: Carbon Dioxide (Carbonation & MAP Gas) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E300: L-Ascorbic Acid (Vitamin C Antioxidant & Flour Improver) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E306: Tocopherol-Rich Extract (Natural Vitamin E Antioxidant) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E322: Lecithin (Phospholipid Emulsifier & Viscosity Reducer) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E330: Citric Acid (Universal Acidulant / Chelator) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E334: L-Tartaric Acid (Wine & Baking Acidulant) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E338: Phosphoric Acid (Cola Acidulant) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E406: Agar-Agar (Seaweed Hydrocolloid Gel) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E407: Carrageenan (Dairy Stabilizer Hydrocolloid) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E410: Locust Bean Gum (Carob Bean Gum / LBG) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E412: Guar Gum (Cold-Soluble Galactomannan) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E414: Gum Arabic (Acacia Gum Emulsifier) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E415: Xanthan Gum (Pseudoplastic Hydrocolloid Thickener) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E422: Glycerol (Glycerin Humectant & Solvent) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E440: Pectin (Citrus & Apple Jam Gelling Fiber) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E460: Microcrystalline Cellulose (MCC / Dietary Bulking) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E471: Mono- & Diglycerides of Fatty Acids (Bread Softener) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E500: Sodium Bicarbonate (Baking Soda / Ins 500ii) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E501: Potassium Carbonate (Potash / Alkaline Noodle Salt) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E503: Ammonium Bicarbonate (Baker's Ammonia / Hartshorn) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E509: Calcium Chloride (Firming Agent / Cheese Salt) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E621: Monosodium Glutamate (MSG / Umami Flavor Enhancer) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E627: Disodium Guanylate (GMP Umami Synergist) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E631: Disodium Inosinate (IMP Meat Umami Synergist) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E635: Disodium 5'-Ribonucleotides (I+G Blend) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E950: Acesulfame Potassium (Ace-K / 200x Sweetener) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E951: Aspartame (Dipeptide Sweetener / 200x) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E955: Sucralose (Splenda / 600x Heat-Stable Sweetener) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E960: Steviol Glycosides (Reb-A / Stevia Extract) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E965: Maltitol (Sugar Alcohol / 90% Sweetness) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E967: Xylitol (Birch Sugar / Dental Caries Inhibitor) → Compare E101: Riboflavin (Vitamin B2 Yellow Color) vs. E968: Erythritol (Zero-Calorie Fermented Polyol) →