Reported in EPA TSCA Inventory.

OSHA PEL: Total Dust: 15 mg/m³; Respirable Fraction: 5 mg/m³
ACGIH TLV: TWA (nuisance particulate) 10 mg/m³ of total dust (when toxic impurities are not present, e.g., quartz <1%); Not Classifiable as a Human Carcinogen
NIOSH REL: (Starch, Respirable Fraction) 5 mg/m³; (total dust) 10 mg/m³

Starch (CAS NO.9005-25-8) is combustible. Presents a dust explosion hazard if dispersed as a fine dust in air in sufficient concentrations. Pure starch is a white, tasteless and odourless powder that is insoluble in cold water or alcohol. It consists of two types of molecules: the linear and helical amylose and the branched amylopectin. Granules swell greatly in water and produce a colloidal suspension. Incompatible with oxidizing agents, acids, iodine, bases. Reacts with nitric acid/sulfuric acid mixtures to give nitroStarch, an explosive. This polysaccharide is produced by all green plants as an energy store.

Physical properties about Starch are: (1)ACD/LogP: -3.391; (2)# of Rule of 5 Violations: 2; (3)ACD/LogD (pH 5.5): -3.39; (4)ACD/LogD (pH 7.4): -3.39; (5)ACD/BCF (pH 5.5): 1.00; (6)ACD/BCF (pH 7.4): 1.00; (7)ACD/KOC (pH 5.5): 1.00; (8)ACD/KOC (pH 7.4): 1.00; (9)#H bond acceptors: 11; (10)#H bond donors: 8; (11)#Freely Rotating Bonds: 12; (12)Index of Refraction: 1.652; (13)Molar Refractivity: 70.805 cm³; (14)Molar Volume: 193.644 cm³; (15)Polarizability: 28.069 10-24cm³; (16)Surface Tension: 110.889999389648 dyne/cm; (17)Density: 1.768 g/cm³; (18)Flash Point: 357.752 °C ; (19)Enthalpy of Vaporization: 112.363 kJ/mol; (20)Boiling Point: 667.931 °C at 760 mmHg;

Uses of Starch: Starch is the most common carbohydrate in the human diet and is contained in many staple foods. Widely used prepared foods containing starch are bread, pancakes, cereals, noodles, pasta, porridge and tortilla. In addition, In a typical sheet of copy paper for instance, the starch content may be as high as 8%. Both chemically modified and unmodified starches are used in papermaking.

You can still convert the following datas into molecular structure:
(1)SMILES:O([C@H]1[C@H](O)[C@@H](O)[C@@H](O)O[C@@H]1CO)[C@H]2O[C@@H]([C@@H](O)[C@H](O)[C@H]2O)CO; (2)Std. InChI:InChI=1S/C12H22O11/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17/h3-20H,1-2H2/t3-,4-,5-,6+,7-,8-,9-,10-,11+,12-/m1/s1;
(3)Std. InChIKey:GUBGYTABKSRVRQ-ASMJPISFSA-N;

The toxicity data is as follows: