Tống Thị Ánh Ngọc * , Đặng Thị Thu Tâm Phan Ngọc Hạnh Ngân

* Tác giả liên hệ (ttangoc@ctu.edu.vn)

Abstract

Oyster mushroom (Pleurotus sajor-caju) is known as a great nutritious material with bioactive compounds playing an important role in antioxidant activity (total phenolic content: 1.92±0.21 mg GAE/g and DPPH: 3.50±0.20 mg TE/g). However, its shelf life is short due to a high amount of moisture content (>90%). To produce high-quality, shelf-stable oyster mushroom floss, the study was conducted to investigate the effects of pre-processing sequences (tear – blanch – freeze), seasoning levels (3, 4, 5%), and sugar concentrations (5, 6, 7%), and methods of heat transfer (drying, roasting, and a combination of both). The results indicated that tearing followed by blanching and freezing provided the best integrity for the product. The oyster mushroom floss, supplemented with 4% seasoning and 5% sugar and combined heat treatment, achieved a good quality of 20±1% moisture, water activity (aw) 0.65, recovery efficiency greater than 77%, and a sensory acceptance score was out of 8/9. This innovation offers an effective solution for enhancing product stability and quality while reducing production time, improving sensory characteristics, and preserving nutritional properties by integrating freezing and combined heat processing techniques.

Keywords: DPPH, floss, oyster mushroom, quality, TPC

Tóm tắt

Nấm bào ngư (Pleurotus sajor-caju) là nguyên liệu giàu dinh dưỡng và chứa nhiều hợp chất sinh học có hoạt tính chống oxy hóa (phenolic tổng số: 1,92±0,21 mg GAE/g, DPPH: 3,50±0,20 mg TE/g), nhưng khó bảo quản do độ ẩm cao (>90%). Nghiên cứu được thực hiện nhằm chế biến chà bông nấm với chất lượng tốt thông qua khảo sát công đoạn xử lý (xé – chần – cấp đông), hàm lượng hạt nêm (3, 4, 5%) và đường (5, 6, 7%) và phương pháp xử lý nhiệt (sấy, sao rang, kết hợp). Kết quả cho thấy, nấm được xé – chần – cấp đông tạo ra sản phẩm có chất lượng tốt và tạo điều kiện thuận lợi cho việc lưu trữ, chế biến. Hạt nêm được bổ sung 4% và 5% đường kết hợp với sấy và sao rang giúp chà bông nấm đạt chất lượng tốt với độ ẩm 20±1%, aw 0,65, hiệu suất thu hồi >77%, và mức độ yêu thích 8/9 điểm. Nghiên cứu đã phát triển quy trình sản xuất bằng việc kết hợp các phương pháp chế biến, rút ngắn thời gian thực hiện, nâng cao giá trị cảm quan, mà không làm giảm chất lượng sản phẩm.

Từ khóa: Chà bông, chất lượng, DPPH, nấm bào ngư, TPC

Article Details

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