Explain the chemical changes associated with food spoilage

Food spoilage is a complex process involving various chemical changes that impact the safety, quality, and edibility of food. These changes can be broadly categorized into several key areas:

### 1. Microbial Metabolism

Microbial growth is a primary factor in food spoilage. Bacteria, yeasts, and molds proliferate in food, metabolizing its nutrients and producing a variety of by-products. For instance, bacteria such as *Pseudomonas* and *Lactobacillus* can break down proteins into peptides and amino acids, which are further degraded into compounds such as ammonia, hydrogen sulfide, and biogenic amines like putrescine and cadaverine. These compounds contribute to off-odors and flavors. Additionally, some bacteria produce acids (e.g., lactic acid from fermentation) __________ _______ ______ _____ _______ _________ ___ ________ ___ _____ _____.
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