文摘
Addition of 1.5% propionic/formic acid (1:1) prevented degradation ofcrab-processing waste for upto 14 days. The preserved waste was ensiled with wheat straw,sugarcane molasses, and water(32:32:16:20, wet basis) with or without 0.1% microbial inoculant.Reductions in pH and watersoluble carbohydrates (WSC) and an increase in lactic acid wereachieved in silages made with orwithout inoculant. Preserving crab waste with either 0.2% sodiumhypochlorite (NaOCl) or 0.4%hydrogen peroxide (H2O2) preventeddeterioration for up to 7 days. The concentration oftrimethylamine (TMA), which indicates offensive odor in marineproducts, increased (P < 0.05)from 3.70 to 12.85 mg of N/100 g in NaOCl-treated waste, compared to nochange (2.66 vs 2.71 mgof N/100 g) for H2O2-treated waste. Theuse of 1% sodium nitrite (NaNO2) and a combinationof0.2% NaOCl/0.2% calcium hypochlorite [Ca(OCl)2] (1:1,w/w) or 0.2% of each alone preserved thewaste for a minimum of 10 days. Ammonia gas was first detected atday 12, and H2S was notdetected throughout the 15 days of preservation with 1%NaNO2. Some chemicals show promisefor preserving crab waste.Keywords: Trimethylamine; chemicals; hydrogen sulfide; ammonia;degradation
