MS 1.01 What is Milk Made Of?

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سنبين لك بإيجاز محتويات كوب الحليب كي نسهل عليك اجتياز الفصول الأولى ونعرفك على بعض المصطلحات مسبقًا. ويمثل الماء حوالي 87٪ من الحليب، إلى جانب السكر (اللاكتوز) والدهون والبروتين. ويوضح الرسم البياني أعلاه بصورة تقريبية نسب المواد الصلبة الذائبة وغير الذائبة الموجودة في الحليب.

In this image you can see the relative proportions of the non-water component of milk.

The protein comes in two main forms: whey and casein. Whey protein is key to giving milk foam its elasticity and stability. (See lesson 2.3) Casein protein in milk is an مستحلب, and it is an important source of nutrition. Casein protein clumps together in a way that not only makes the milk appear white and opaque but also helps it to form small clots in the stomach. This ensures better nutrient absorption for infants.

The milk sugar lactose imparts sweetness, though this sugar is significantly less sweet than sucrose. Like sucrose, lactose is a double sugar, or disaccharide. It is made of galactose and glucose bonded together.

Milk’s third principal constituent is fat. It takes the form of globules, similar to the casein clumps. The interplay between the casein and the fat is key to the successful التجانس. التجانس refers to the process of making things uniform or similar (see lesson 1.6).

Milk is a minor source of vitamins, including C and B12, and a significant source of calcium, magnesium, phosphorus, potassium, selenium, and zinc. Research suggests that ‘intake of milk and dairy products contribute to meet nutrient recommendations, and may protect against the most prevalent chronic diseases, whereas very few adverse effects have been reported’ (Thorning et al 2016)

A barista’s preference for particular ratios of sugar, fat, and protein brings great variation in flavour intensity,

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