Kasın Ete Dönüşümü ve Tekstür Analizleri
Özet
Bu derleme çalışması, hayvan kesimi sonrasında kas dokusunun postmortem biyokimyasal ve fiziksel değişimlerle ete dönüşüm sürecini ve etin tekstürel kalitesini belirleyen analiz yöntemlerini incelemektedir. Kesimle birlikte kan dolaşımının durması sonucu hücresel boyutta anaerobik metabolizmaya geçilmekte; glikojenin laktik aside dönüşmesiyle kas pH’sı 7.2’den 5.5 seviyesine düşmekte ve ATP depolarının tükenmesiyle aktin ile miyosin proteinleri geri dönüşümsüz bağlanarak ölüm sertliğini (rigor mortis) oluşturmaktadır. Postmortem evrede pH düşüşü ve kalsiyum iyonlarının artışıyla aktifleşen kalpain, katepsin ve kaspaz gibi endojen proteolitik enzim sistemleri; titin, nebulin, troponin-T ve desmin gibi miyofibriller proteinleri degrade ederek kas yapısının zayıflamasını, etin olgunlaşmasını ve gevreklik kazanmasını sağlamaktadır. Etin kalite kriterlerinden biri olan tekstürel özelliklerin belirlenmesinde ise enstrümental ve duyusal analiz tekniklerinden yararlanılmaktadır. Mekanik metotlar kapsamında V-şekilli bıçakla maksimum kesme kuvvetini ölçen Warner-Bratzler testi, Kramer kesme hücresi, çekme testi ve çift sıkıştırma ile sertlik, çiğnenebilirlik, esneklik gibi birincil ve ikincil parametreleri saptayan tekstür profil analizi (TPA) kullanılmaktadır. Duyusal analizlerde ise eğitilmiş panelistler tarafından gıdanın ilk ısırık, çiğneme ve yutma aşamalarını kapsayan kalıntı evrelerindeki mekanik, geometrik ve yüzeysel özellikleri standart puan çizelgeleri üzerinden değerlendirilmektedir.
This review study examines the conversion process of muscle tissue into meat through postmortem biochemical and physical changes following slaughter, as well as the analytical methods used to determine meat textural quality. Upon slaughter, the cessation of blood circulation shifts cellular metabolism to an anaerobic pathway; as glycogen converts into lactic acid, muscle pH drops from 7.2 to 5.5, and the depletion of ATP stores leads to the irreversible binding of actin and myosin proteins, forming rigor mortis. In the postmortem phase, endogenous proteolytic enzyme systems such as calpains, cathepsins, and caspases—activated by decreasing pH and increasing calcium ions—degrade myofibrillar proteins including titin, nebulin, troponin-T, and desmin, thereby weakening muscle structure and enabling meat aging, tenderization, and texture development. To determine textural properties, which represent a key quality criterion, both instrumental and sensory analysis techniques are utilized. Instrumental mechanical methods include the Warner-Bratzler shear force test using a V-shaped blade, the Kramer shear cell, tensile testing, and Texture Profile Analysis (TPA) via double compression to measure primary and secondary parameters such as hardness, chewiness, and springiness. In sensory analysis, trained panelists evaluate the mechanical, geometrical, and surface characteristics of the food across initial bite, mastication, and residual stages using standardized scorecards.
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